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HBASE-12975 Supportable SplitTransaction and RegionMergeTransaction interfaces

This commit is contained in:
Andrew Purtell 2015-03-31 16:02:38 -07:00
parent 452ce33ef5
commit e156ed619c
20 changed files with 1936 additions and 1306 deletions
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4
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
View File

@ -6239,7 +6239,7 @@ public class HRegion implements HeapSize, PropagatingConfigurationObserver, Regi
b.getRegionFileSystem().logFileSystemState(LOG);
}
RegionMergeTransaction rmt = new RegionMergeTransaction(a, b, true);
RegionMergeTransactionImpl rmt = new RegionMergeTransactionImpl(a, b, true);
if (!rmt.prepare(null)) {
throw new IOException("Unable to merge regions " + a + " and " + b);
}
@ -6252,7 +6252,7 @@ public class HRegion implements HeapSize, PropagatingConfigurationObserver, Regi
+ Bytes.toStringBinary(mergedRegionInfo.getEndKey()) + ">");
HRegion dstRegion;
try {
dstRegion = rmt.execute(null, null);
dstRegion = (HRegion)rmt.execute(null, null);
} catch (IOException ioe) {
rmt.rollback(null, null);
throw new IOException("Failed merging region " + a + " and " + b

2
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/Region.java
View File

@ -23,9 +23,7 @@ import java.util.List;
import java.util.Map;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.DroppedSnapshotException;
import org.apache.hadoop.hbase.HBaseInterfaceAudience;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.HDFSBlocksDistribution;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.HTableDescriptor;

2
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RegionMergeRequest.java
View File

@ -65,7 +65,7 @@ class RegionMergeRequest implements Runnable {
}
try {
final long startTime = EnvironmentEdgeManager.currentTime();
RegionMergeTransaction mt = new RegionMergeTransaction(region_a,
RegionMergeTransactionImpl mt = new RegionMergeTransactionImpl(region_a,
region_b, forcible);
//acquire a shared read lock on the table, so that table schema modifications

665
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RegionMergeTransaction.java
View File

@ -13,35 +13,20 @@
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitationsME
* License for the specific language governing permissions and limitations
* under the License.
*/
package org.apache.hadoop.hbase.regionserver;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.classification.InterfaceStability;
import org.apache.hadoop.hbase.regionserver.SplitTransaction.TransactionListener;
import org.apache.hadoop.hbase.HBaseInterfaceAudience;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.MetaMutationAnnotation;
import org.apache.hadoop.hbase.MetaTableAccessor;
import org.apache.hadoop.hbase.Server;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.Mutation;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.protobuf.generated.RegionServerStatusProtos.RegionStateTransition.TransitionCode;
import org.apache.hadoop.hbase.regionserver.SplitTransaction.LoggingProgressable;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
import org.apache.hadoop.hbase.util.Pair;
/**
* Executes region merge as a "transaction". It is similar with
@ -50,12 +35,21 @@ import org.apache.hadoop.hbase.util.Pair;
* transaction and {@link #rollback(Server, RegionServerServices)} to cleanup if
* execute fails.
*
* <p>
* Here is an example of how you would use this class:
*
* <p>Here is an example of how you would use this interface:
* <pre>
* RegionMergeTransaction mt = new RegionMergeTransaction(this.conf, parent, midKey)
* if (!mt.prepare(services)) return;
* RegionMergeTransactionFactory factory = new RegionMergeTransactionFactory(conf);
* RegionMergeTransaction mt = factory.create(parent, midKey)
* .registerTransactionListener(new TransactionListener() {
* public void transition(RegionMergeTransaction transaction,
* RegionMergeTransactionPhase from, RegionMergeTransactionPhase to) throws IOException {
* // ...
* }
* public void rollback(RegionMergeTransaction transaction,
* RegionMergeTransactionPhase from, RegionMergeTransactionPhase to) {
* // ...
* }
* });
* if (!mt.prepare()) return;
* try {
* mt.execute(server, services);
* } catch (IOException ioe) {
@ -63,33 +57,25 @@ import org.apache.hadoop.hbase.util.Pair;
* mt.rollback(server, services);
* return;
* } catch (RuntimeException e) {
* myAbortable.abort("Failed merge, abort");
* // abort the server
* }
* }
* </Pre>
* <p>
* This class is not thread safe. Caller needs ensure merge is run by one thread
* only.
* <p>A merge transaction is not thread safe. Callers must ensure a split is run by
* one thread only.
*/
@InterfaceAudience.Private
public class RegionMergeTransaction {
private static final Log LOG = LogFactory.getLog(RegionMergeTransaction.class);
// Merged region info
private HRegionInfo mergedRegionInfo;
// region_a sorts before region_b
private final HRegion region_a;
private final HRegion region_b;
// merges dir is under region_a
private final Path mergesdir;
// We only merge adjacent regions if forcible is false
private final boolean forcible;
@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.COPROC)
@InterfaceStability.Evolving
public interface RegionMergeTransaction {
/**
* Types to add to the transaction journal. Each enum is a step in the merge
* transaction. Used to figure how much we need to rollback.
* Each enum is a step in the merge transaction.
*/
enum JournalEntry {
enum RegionMergeTransactionPhase {
STARTED,
/**
* Prepared
*/
PREPARED,
/**
* Set region as in transition, set it into MERGING state.
*/
@ -122,95 +108,59 @@ public class RegionMergeTransaction {
* Point of no return. If we got here, then transaction is not recoverable
* other than by crashing out the regionserver.
*/
PONR
}
/*
* Journal of how far the merge transaction has progressed.
*/
private final List<JournalEntry> journal = new ArrayList<JournalEntry>();
private static IOException closedByOtherException = new IOException(
"Failed to close region: already closed by another thread");
private RegionServerCoprocessorHost rsCoprocessorHost = null;
PONR,
/**
* Constructor
* @param a region a to merge
* @param b region b to merge
* @param forcible if false, we will only merge adjacent regions
* Completed
*/
public RegionMergeTransaction(final Region a, final Region b,
final boolean forcible) {
if (a.getRegionInfo().compareTo(b.getRegionInfo()) <= 0) {
this.region_a = (HRegion)a;
this.region_b = (HRegion)b;
} else {
this.region_a = (HRegion)b;
this.region_b = (HRegion)a;
}
this.forcible = forcible;
this.mergesdir = region_a.getRegionFileSystem().getMergesDir();
COMPLETED
}
/**
* Does checks on merge inputs.
* Split transaction journal entry
*/
public interface JournalEntry {
/** @return the completed phase marked by this journal entry */
RegionMergeTransactionPhase getPhase();
/** @return the time of phase completion */
long getTimeStamp();
}
/**
* Split transaction listener
*/
public interface TransactionListener {
/**
* Invoked when transitioning forward from one transaction phase to another
* @param transaction the transaction
* @param from the current phase
* @param to the next phase
* @throws IOException listener can throw this to abort
*/
void transition(RegionMergeTransaction transaction, RegionMergeTransactionPhase from,
RegionMergeTransactionPhase to) throws IOException;
/**
* Invoked when rolling back a transaction from one transaction phase to the
* previous
* @param transaction the transaction
* @param from the current phase
* @param to the previous phase
*/
void rollback(RegionMergeTransaction transaction, RegionMergeTransactionPhase from,
RegionMergeTransactionPhase to);
}
/**
* Check merge inputs and prepare the transaction.
* @param services
* @return <code>true</code> if the regions are mergeable else
* <code>false</code> if they are not (e.g. its already closed, etc.).
* @throws IOException
*/
public boolean prepare(final RegionServerServices services) {
if (!region_a.getTableDesc().getTableName()
.equals(region_b.getTableDesc().getTableName())) {
LOG.info("Can't merge regions " + region_a + "," + region_b
+ " because they do not belong to the same table");
return false;
}
if (region_a.getRegionInfo().equals(region_b.getRegionInfo())) {
LOG.info("Can't merge the same region " + region_a);
return false;
}
if (!forcible && !HRegionInfo.areAdjacent(region_a.getRegionInfo(),
region_b.getRegionInfo())) {
String msg = "Skip merging " + this.region_a.getRegionInfo().getRegionNameAsString()
+ " and " + this.region_b.getRegionInfo().getRegionNameAsString()
+ ", because they are not adjacent.";
LOG.info(msg);
return false;
}
if (!this.region_a.isMergeable() || !this.region_b.isMergeable()) {
return false;
}
try {
boolean regionAHasMergeQualifier = hasMergeQualifierInMeta(services,
region_a.getRegionInfo().getRegionName());
if (regionAHasMergeQualifier ||
hasMergeQualifierInMeta(services, region_b.getRegionInfo().getRegionName())) {
LOG.debug("Region " + (regionAHasMergeQualifier ?
region_a.getRegionInfo().getRegionNameAsString() :
region_b.getRegionInfo().getRegionNameAsString())
+ " is not mergeable because it has merge qualifier in META");
return false;
}
} catch (IOException e) {
LOG.warn("Failed judging whether merge transaction is available for "
+ region_a.getRegionInfo().getRegionNameAsString() + " and "
+ region_b.getRegionInfo().getRegionNameAsString(), e);
return false;
}
// WARN: make sure there is no parent region of the two merging regions in
// hbase:meta If exists, fixing up daughters would cause daughter regions(we
// have merged one) online again when we restart master, so we should clear
// the parent region to prevent the above case
// Since HBASE-7721, we don't need fix up daughters any more. so here do
// nothing
this.mergedRegionInfo = getMergedRegionInfo(region_a.getRegionInfo(),
region_b.getRegionInfo());
return true;
}
boolean prepare(RegionServerServices services) throws IOException;
/**
* Run the transaction.
@ -222,325 +172,10 @@ public class RegionMergeTransaction {
* @throws IOException
* @see #rollback(Server, RegionServerServices)
*/
public HRegion execute(final Server server,
final RegionServerServices services) throws IOException {
if (rsCoprocessorHost == null) {
rsCoprocessorHost = server != null ?
((HRegionServer) server).getRegionServerCoprocessorHost() : null;
}
HRegion mergedRegion = createMergedRegion(server, services);
if (rsCoprocessorHost != null) {
rsCoprocessorHost.postMergeCommit(this.region_a, this.region_b, mergedRegion);
}
return stepsAfterPONR(server, services, mergedRegion);
}
public HRegion stepsAfterPONR(final Server server, final RegionServerServices services,
HRegion mergedRegion) throws IOException {
openMergedRegion(server, services, mergedRegion);
if (rsCoprocessorHost != null) {
rsCoprocessorHost.postMerge(this.region_a, this.region_b, mergedRegion);
}
return mergedRegion;
}
/**
* Prepare the merged region and region files.
* @param server Hosting server instance. Can be null when testing
* @param services Used to online/offline regions.
* @return merged region
* @throws IOException If thrown, transaction failed. Call
* {@link #rollback(Server, RegionServerServices)}
*/
HRegion createMergedRegion(final Server server,
final RegionServerServices services) throws IOException {
LOG.info("Starting merge of " + region_a + " and "
+ region_b.getRegionInfo().getRegionNameAsString() + ", forcible=" + forcible);
if ((server != null && server.isStopped())
|| (services != null && services.isStopping())) {
throw new IOException("Server is stopped or stopping");
}
if (rsCoprocessorHost != null) {
if (rsCoprocessorHost.preMerge(this.region_a, this.region_b)) {
throw new IOException("Coprocessor bypassing regions " + this.region_a + " "
+ this.region_b + " merge.");
}
}
// If true, no cluster to write meta edits to or to use coordination.
boolean testing = server == null ? true : server.getConfiguration()
.getBoolean("hbase.testing.nocluster", false);
HRegion mergedRegion = stepsBeforePONR(server, services, testing);
@MetaMutationAnnotation
List<Mutation> metaEntries = new ArrayList<Mutation>();
if (rsCoprocessorHost != null) {
if (rsCoprocessorHost.preMergeCommit(this.region_a, this.region_b, metaEntries)) {
throw new IOException("Coprocessor bypassing regions " + this.region_a + " "
+ this.region_b + " merge.");
}
try {
for (Mutation p : metaEntries) {
HRegionInfo.parseRegionName(p.getRow());
}
} catch (IOException e) {
LOG.error("Row key of mutation from coprocessor is not parsable as region name."
+ "Mutations from coprocessor should only be for hbase:meta table.", e);
throw e;
}
}
// This is the point of no return. Similar with SplitTransaction.
// IF we reach the PONR then subsequent failures need to crash out this
// regionserver
this.journal.add(JournalEntry.PONR);
// Add merged region and delete region_a and region_b
// as an atomic update. See HBASE-7721. This update to hbase:meta makes the region
// will determine whether the region is merged or not in case of failures.
// If it is successful, master will roll-forward, if not, master will
// rollback
if (services != null && !services.reportRegionStateTransition(TransitionCode.MERGE_PONR,
mergedRegionInfo, region_a.getRegionInfo(), region_b.getRegionInfo())) {
// Passed PONR, let SSH clean it up
throw new IOException("Failed to notify master that merge passed PONR: "
+ region_a.getRegionInfo().getRegionNameAsString() + " and "
+ region_b.getRegionInfo().getRegionNameAsString());
}
return mergedRegion;
}
public void prepareMutationsForMerge(HRegionInfo mergedRegion, HRegionInfo regionA,
HRegionInfo regionB, ServerName serverName, List<Mutation> mutations) throws IOException {
HRegionInfo copyOfMerged = new HRegionInfo(mergedRegion);
// Put for parent
Put putOfMerged = MetaTableAccessor.makePutFromRegionInfo(copyOfMerged);
putOfMerged.add(HConstants.CATALOG_FAMILY, HConstants.MERGEA_QUALIFIER, regionA.toByteArray());
putOfMerged.add(HConstants.CATALOG_FAMILY, HConstants.MERGEB_QUALIFIER, regionB.toByteArray());
mutations.add(putOfMerged);
// Deletes for merging regions
Delete deleteA = MetaTableAccessor.makeDeleteFromRegionInfo(regionA);
Delete deleteB = MetaTableAccessor.makeDeleteFromRegionInfo(regionB);
mutations.add(deleteA);
mutations.add(deleteB);
// The merged is a new region, openSeqNum = 1 is fine.
addLocation(putOfMerged, serverName, 1);
}
public Put addLocation(final Put p, final ServerName sn, long openSeqNum) {
p.add(HConstants.CATALOG_FAMILY, HConstants.SERVER_QUALIFIER, Bytes
.toBytes(sn.getHostAndPort()));
p.add(HConstants.CATALOG_FAMILY, HConstants.STARTCODE_QUALIFIER, Bytes.toBytes(sn
.getStartcode()));
p.add(HConstants.CATALOG_FAMILY, HConstants.SEQNUM_QUALIFIER, Bytes.toBytes(openSeqNum));
return p;
}
public HRegion stepsBeforePONR(final Server server, final RegionServerServices services,
boolean testing) throws IOException {
if (services != null && !services.reportRegionStateTransition(TransitionCode.READY_TO_MERGE,
mergedRegionInfo, region_a.getRegionInfo(), region_b.getRegionInfo())) {
throw new IOException("Failed to get ok from master to merge "
+ region_a.getRegionInfo().getRegionNameAsString() + " and "
+ region_b.getRegionInfo().getRegionNameAsString());
}
this.journal.add(JournalEntry.SET_MERGING);
this.region_a.getRegionFileSystem().createMergesDir();
this.journal.add(JournalEntry.CREATED_MERGE_DIR);
Map<byte[], List<StoreFile>> hstoreFilesOfRegionA = closeAndOfflineRegion(
services, this.region_a, true, testing);
Map<byte[], List<StoreFile>> hstoreFilesOfRegionB = closeAndOfflineRegion(
services, this.region_b, false, testing);
assert hstoreFilesOfRegionA != null && hstoreFilesOfRegionB != null;
//
// mergeStoreFiles creates merged region dirs under the region_a merges dir
// Nothing to unroll here if failure -- clean up of CREATE_MERGE_DIR will
// clean this up.
mergeStoreFiles(hstoreFilesOfRegionA, hstoreFilesOfRegionB);
// Log to the journal that we are creating merged region. We could fail
// halfway through. If we do, we could have left
// stuff in fs that needs cleanup -- a storefile or two. Thats why we
// add entry to journal BEFORE rather than AFTER the change.
this.journal.add(JournalEntry.STARTED_MERGED_REGION_CREATION);
HRegion mergedRegion = createMergedRegionFromMerges(this.region_a,
this.region_b, this.mergedRegionInfo);
return mergedRegion;
}
/**
* Create a merged region from the merges directory under region a. In order
* to mock it for tests, place it with a new method.
* @param a hri of region a
* @param b hri of region b
* @param mergedRegion hri of merged region
* @return merged HRegion.
* @throws IOException
*/
HRegion createMergedRegionFromMerges(final HRegion a, final HRegion b,
final HRegionInfo mergedRegion) throws IOException {
return a.createMergedRegionFromMerges(mergedRegion, b);
}
/**
* Close the merging region and offline it in regionserver
* @param services
* @param region
* @param isRegionA true if it is merging region a, false if it is region b
* @param testing true if it is testing
* @return a map of family name to list of store files
* @throws IOException
*/
private Map<byte[], List<StoreFile>> closeAndOfflineRegion(
final RegionServerServices services, final HRegion region,
final boolean isRegionA, final boolean testing) throws IOException {
Map<byte[], List<StoreFile>> hstoreFilesToMerge = null;
Exception exceptionToThrow = null;
try {
hstoreFilesToMerge = region.close(false);
} catch (Exception e) {
exceptionToThrow = e;
}
if (exceptionToThrow == null && hstoreFilesToMerge == null) {
// The region was closed by a concurrent thread. We can't continue
// with the merge, instead we must just abandon the merge. If we
// reopen or merge this could cause problems because the region has
// probably already been moved to a different server, or is in the
// process of moving to a different server.
exceptionToThrow = closedByOtherException;
}
if (exceptionToThrow != closedByOtherException) {
this.journal.add(isRegionA ? JournalEntry.CLOSED_REGION_A
: JournalEntry.CLOSED_REGION_B);
}
if (exceptionToThrow != null) {
if (exceptionToThrow instanceof IOException)
throw (IOException) exceptionToThrow;
throw new IOException(exceptionToThrow);
}
if (!testing) {
services.removeFromOnlineRegions(region, null);
}
this.journal.add(isRegionA ? JournalEntry.OFFLINED_REGION_A
: JournalEntry.OFFLINED_REGION_B);
return hstoreFilesToMerge;
}
/**
* Get merged region info through the specified two regions
* @param a merging region A
* @param b merging region B
* @return the merged region info
*/
public static HRegionInfo getMergedRegionInfo(final HRegionInfo a,
final HRegionInfo b) {
long rid = EnvironmentEdgeManager.currentTime();
// Regionid is timestamp. Merged region's id can't be less than that of
// merging regions else will insert at wrong location in hbase:meta
if (rid < a.getRegionId() || rid < b.getRegionId()) {
LOG.warn("Clock skew; merging regions id are " + a.getRegionId()
+ " and " + b.getRegionId() + ", but current time here is " + rid);
rid = Math.max(a.getRegionId(), b.getRegionId()) + 1;
}
byte[] startKey = null;
byte[] endKey = null;
// Choose the smaller as start key
if (a.compareTo(b) <= 0) {
startKey = a.getStartKey();
} else {
startKey = b.getStartKey();
}
// Choose the bigger as end key
if (Bytes.equals(a.getEndKey(), HConstants.EMPTY_BYTE_ARRAY)
|| (!Bytes.equals(b.getEndKey(), HConstants.EMPTY_BYTE_ARRAY)
&& Bytes.compareTo(a.getEndKey(), b.getEndKey()) > 0)) {
endKey = a.getEndKey();
} else {
endKey = b.getEndKey();
}
// Merged region is sorted between two merging regions in META
HRegionInfo mergedRegionInfo = new HRegionInfo(a.getTable(), startKey,
endKey, false, rid);
return mergedRegionInfo;
}
/**
* Perform time consuming opening of the merged region.
* @param server Hosting server instance. Can be null when testing
* @param services Used to online/offline regions.
* @param merged the merged region
* @throws IOException If thrown, transaction failed. Call
* {@link #rollback(Server, RegionServerServices)}
*/
void openMergedRegion(final Server server,
final RegionServerServices services, HRegion merged) throws IOException {
boolean stopped = server != null && server.isStopped();
boolean stopping = services != null && services.isStopping();
if (stopped || stopping) {
LOG.info("Not opening merged region " + merged.getRegionInfo().getRegionNameAsString()
+ " because stopping=" + stopping + ", stopped=" + stopped);
return;
}
HRegionInfo hri = merged.getRegionInfo();
LoggingProgressable reporter = server == null ? null
: new LoggingProgressable(hri, server.getConfiguration().getLong(
"hbase.regionserver.regionmerge.open.log.interval", 10000));
merged.openHRegion(reporter);
if (services != null) {
if (!services.reportRegionStateTransition(TransitionCode.MERGED,
mergedRegionInfo, region_a.getRegionInfo(), region_b.getRegionInfo())) {
throw new IOException("Failed to report merged region to master: "
+ mergedRegionInfo.getShortNameToLog());
}
services.addToOnlineRegions(merged);
}
}
/**
* Create reference file(s) of merging regions under the region_a merges dir
* @param hstoreFilesOfRegionA
* @param hstoreFilesOfRegionB
* @throws IOException
*/
private void mergeStoreFiles(
Map<byte[], List<StoreFile>> hstoreFilesOfRegionA,
Map<byte[], List<StoreFile>> hstoreFilesOfRegionB)
throws IOException {
// Create reference file(s) of region A in mergdir
HRegionFileSystem fs_a = this.region_a.getRegionFileSystem();
for (Map.Entry<byte[], List<StoreFile>> entry : hstoreFilesOfRegionA
.entrySet()) {
String familyName = Bytes.toString(entry.getKey());
for (StoreFile storeFile : entry.getValue()) {
fs_a.mergeStoreFile(this.mergedRegionInfo, familyName, storeFile,
this.mergesdir);
}
}
// Create reference file(s) of region B in mergedir
HRegionFileSystem fs_b = this.region_b.getRegionFileSystem();
for (Map.Entry<byte[], List<StoreFile>> entry : hstoreFilesOfRegionB
.entrySet()) {
String familyName = Bytes.toString(entry.getKey());
for (StoreFile storeFile : entry.getValue()) {
fs_b.mergeStoreFile(this.mergedRegionInfo, familyName, storeFile,
this.mergesdir);
}
}
}
Region execute(Server server, RegionServerServices services) throws IOException;
/**
* Roll back a failed transaction
* @param server Hosting server instance (May be null when testing).
* @param services Services of regionserver, used to online regions.
* @throws IOException If thrown, rollback failed. Take drastic action.
@ -548,123 +183,37 @@ public class RegionMergeTransaction {
* of no return and so now need to abort the server to minimize
* damage.
*/
@SuppressWarnings("deprecation")
public boolean rollback(final Server server,
final RegionServerServices services) throws IOException {
assert this.mergedRegionInfo != null;
// Coprocessor callback
if (rsCoprocessorHost != null) {
rsCoprocessorHost.preRollBackMerge(this.region_a, this.region_b);
}
boolean result = true;
ListIterator<JournalEntry> iterator = this.journal
.listIterator(this.journal.size());
// Iterate in reverse.
while (iterator.hasPrevious()) {
JournalEntry je = iterator.previous();
switch (je) {
case SET_MERGING:
if (services != null
&& !services.reportRegionStateTransition(TransitionCode.MERGE_REVERTED,
mergedRegionInfo, region_a.getRegionInfo(), region_b.getRegionInfo())) {
return false;
}
break;
case CREATED_MERGE_DIR:
this.region_a.writestate.writesEnabled = true;
this.region_b.writestate.writesEnabled = true;
this.region_a.getRegionFileSystem().cleanupMergesDir();
break;
case CLOSED_REGION_A:
try {
// So, this returns a seqid but if we just closed and then reopened,
// we should be ok. On close, we flushed using sequenceid obtained
// from hosting regionserver so no need to propagate the sequenceid
// returned out of initialize below up into regionserver as we
// normally do.
this.region_a.initialize();
} catch (IOException e) {
LOG.error("Failed rollbacking CLOSED_REGION_A of region "
+ this.region_a.getRegionInfo().getRegionNameAsString(), e);
throw new RuntimeException(e);
}
break;
case OFFLINED_REGION_A:
if (services != null)
services.addToOnlineRegions(this.region_a);
break;
case CLOSED_REGION_B:
try {
this.region_b.initialize();
} catch (IOException e) {
LOG.error("Failed rollbacking CLOSED_REGION_A of region "
+ this.region_b.getRegionInfo().getRegionNameAsString(), e);
throw new RuntimeException(e);
}
break;
case OFFLINED_REGION_B:
if (services != null)
services.addToOnlineRegions(this.region_b);
break;
case STARTED_MERGED_REGION_CREATION:
this.region_a.getRegionFileSystem().cleanupMergedRegion(
this.mergedRegionInfo);
break;
case PONR:
// We got to the point-of-no-return so we need to just abort. Return
// immediately. Do not clean up created merged regions.
return false;
default:
throw new RuntimeException("Unhandled journal entry: " + je);
}
}
// Coprocessor callback
if (rsCoprocessorHost != null) {
rsCoprocessorHost.postRollBackMerge(this.region_a, this.region_b);
}
return result;
}
HRegionInfo getMergedRegionInfo() {
return this.mergedRegionInfo;
}
// For unit testing.
Path getMergesDir() {
return this.mergesdir;
}
boolean rollback(Server server, RegionServerServices services) throws IOException;
/**
* Checks if the given region has merge qualifier in hbase:meta
* @param services
* @param regionName name of specified region
* @return true if the given region has merge qualifier in META.(It will be
* cleaned by CatalogJanitor)
* @throws IOException
* Register a listener for transaction preparation, execution, and possibly
* rollback phases.
* <p>A listener can abort a transaction by throwing an exception.
* @param listener the listener
* @return 'this' for chaining
*/
boolean hasMergeQualifierInMeta(final RegionServerServices services,
final byte[] regionName) throws IOException {
if (services == null) return false;
// Get merge regions if it is a merged region and already has merge
// qualifier
Pair<HRegionInfo, HRegionInfo> mergeRegions = MetaTableAccessor
.getRegionsFromMergeQualifier(services.getConnection(), regionName);
if (mergeRegions != null &&
(mergeRegions.getFirst() != null || mergeRegions.getSecond() != null)) {
// It has merge qualifier
return true;
}
return false;
}
RegionMergeTransaction registerTransactionListener(TransactionListener listener);
/** @return merged region info */
HRegionInfo getMergedRegionInfo();
/**
* Get the journal for the transaction.
* <p>Journal entries are an opaque type represented as JournalEntry. They can
* also provide useful debugging information via their toString method.
* @return the transaction journal
*/
List<JournalEntry> getJournal();
/**
* Get the Server running the transaction or rollback
* @return server instance
*/
Server getServer();
/**
* Get the RegonServerServices of the server running the transaction or rollback
* @return region server services
*/
RegionServerServices getRegionServerServices();
}

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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hbase.regionserver;
import org.apache.hadoop.conf.Configurable;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseInterfaceAudience;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.classification.InterfaceStability;
import org.apache.hadoop.hbase.util.ReflectionUtils;
/**
* A factory for creating RegionMergeTransactions, which execute region split as a "transaction".
* See {@link RegionMergeTransactionImpl}
*/
@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.COPROC)
@InterfaceStability.Evolving
public class RegionMergeTransactionFactory implements Configurable {
public static final String MERGE_TRANSACTION_IMPL_KEY =
"hbase.regionserver.merge.transaction.impl";
private Configuration conf;
public RegionMergeTransactionFactory(Configuration conf) {
this.conf = conf;
}
@Override
public Configuration getConf() {
return conf;
}
@Override
public void setConf(Configuration conf) {
this.conf = conf;
}
/**
* Create a merge transaction
* @param a region a to merge
* @param b region b to merge
* @param forcible if false, we will only merge adjacent regions
* @return transaction instance
*/
public RegionMergeTransactionImpl create(final Region a, final Region b,
final boolean forcible) {
// The implementation class must extend RegionMergeTransactionImpl, not only
// implement the RegionMergeTransaction interface like you might expect,
// because various places such as AssignmentManager use static methods
// from RegionMergeTransactionImpl. Whatever we use for implementation must
// be compatible, so it's safest to require ? extends RegionMergeTransactionImpl.
// If not compatible we will throw a runtime exception from here.
return ReflectionUtils.instantiateWithCustomCtor(
conf.getClass(MERGE_TRANSACTION_IMPL_KEY, RegionMergeTransactionImpl.class,
RegionMergeTransactionImpl.class).getName(),
new Class[] { Region.class, Region.class, boolean.class },
new Object[] { a, b, forcible });
}
}

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/**
* Copyright The Apache Software Foundation
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with this
* work for additional information regarding copyright ownership. The ASF
* licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitationsME
* under the License.
*/
package org.apache.hadoop.hbase.regionserver;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.MetaMutationAnnotation;
import org.apache.hadoop.hbase.MetaTableAccessor;
import org.apache.hadoop.hbase.Server;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.Mutation;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.protobuf.generated.RegionServerStatusProtos.RegionStateTransition.TransitionCode;
import org.apache.hadoop.hbase.regionserver.SplitTransactionImpl.LoggingProgressable;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
import org.apache.hadoop.hbase.util.Pair;
import com.google.common.annotations.VisibleForTesting;
@InterfaceAudience.Private
public class RegionMergeTransactionImpl implements RegionMergeTransaction {
private static final Log LOG = LogFactory.getLog(RegionMergeTransactionImpl.class);
// Merged region info
private HRegionInfo mergedRegionInfo;
// region_a sorts before region_b
private final HRegion region_a;
private final HRegion region_b;
// merges dir is under region_a
private final Path mergesdir;
// We only merge adjacent regions if forcible is false
private final boolean forcible;
/*
* Transaction state for listener, only valid during execute and
* rollback
*/
private RegionMergeTransactionPhase currentPhase = RegionMergeTransactionPhase.STARTED;
private Server server;
private RegionServerServices rsServices;
public static class JournalEntryImpl implements JournalEntry {
private RegionMergeTransactionPhase type;
private long timestamp;
public JournalEntryImpl(RegionMergeTransactionPhase type) {
this(type, EnvironmentEdgeManager.currentTime());
}
public JournalEntryImpl(RegionMergeTransactionPhase type, long timestamp) {
this.type = type;
this.timestamp = timestamp;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append(type);
sb.append(" at ");
sb.append(timestamp);
return sb.toString();
}
@Override
public RegionMergeTransactionPhase getPhase() {
return type;
}
@Override
public long getTimeStamp() {
return timestamp;
}
}
/*
* Journal of how far the merge transaction has progressed.
*/
private final List<JournalEntry> journal = new ArrayList<JournalEntry>();
/**
* Listeners
*/
private final ArrayList<TransactionListener> listeners = new ArrayList<TransactionListener>();
private static IOException closedByOtherException = new IOException(
"Failed to close region: already closed by another thread");
private RegionServerCoprocessorHost rsCoprocessorHost = null;
/**
* Constructor
* @param a region a to merge
* @param b region b to merge
* @param forcible if false, we will only merge adjacent regions
*/
public RegionMergeTransactionImpl(final HRegion a, final HRegion b,
final boolean forcible) {
if (a.getRegionInfo().compareTo(b.getRegionInfo()) <= 0) {
this.region_a = a;
this.region_b = b;
} else {
this.region_a = b;
this.region_b = a;
}
this.forcible = forcible;
this.mergesdir = region_a.getRegionFileSystem().getMergesDir();
}
private void transition(RegionMergeTransactionPhase nextPhase) throws IOException {
transition(nextPhase, false);
}
private void transition(RegionMergeTransactionPhase nextPhase, boolean isRollback)
throws IOException {
if (!isRollback) {
// Add to the journal first, because if the listener throws an exception
// we need to roll back starting at 'nextPhase'
this.journal.add(new JournalEntryImpl(nextPhase));
}
for (int i = 0; i < listeners.size(); i++) {
TransactionListener listener = listeners.get(i);
if (!isRollback) {
listener.transition(this, currentPhase, nextPhase);
} else {
listener.rollback(this, currentPhase, nextPhase);
}
}
currentPhase = nextPhase;
}
@Override
public boolean prepare(final RegionServerServices services) throws IOException {
if (!region_a.getTableDesc().getTableName()
.equals(region_b.getTableDesc().getTableName())) {
LOG.info("Can't merge regions " + region_a + "," + region_b
+ " because they do not belong to the same table");
return false;
}
if (region_a.getRegionInfo().equals(region_b.getRegionInfo())) {
LOG.info("Can't merge the same region " + region_a);
return false;
}
if (!forcible && !HRegionInfo.areAdjacent(region_a.getRegionInfo(),
region_b.getRegionInfo())) {
String msg = "Skip merging " + region_a.getRegionInfo().getRegionNameAsString()
+ " and " + region_b.getRegionInfo().getRegionNameAsString()
+ ", because they are not adjacent.";
LOG.info(msg);
return false;
}
if (!this.region_a.isMergeable() || !this.region_b.isMergeable()) {
return false;
}
try {
boolean regionAHasMergeQualifier = hasMergeQualifierInMeta(services,
region_a.getRegionInfo().getRegionName());
if (regionAHasMergeQualifier ||
hasMergeQualifierInMeta(services, region_b.getRegionInfo().getRegionName())) {
LOG.debug("Region " + (regionAHasMergeQualifier ?
region_a.getRegionInfo().getRegionNameAsString()
: region_b.getRegionInfo().getRegionNameAsString())
+ " is not mergeable because it has merge qualifier in META");
return false;
}
} catch (IOException e) {
LOG.warn("Failed judging whether merge transaction is available for "
+ region_a.getRegionInfo().getRegionNameAsString() + " and "
+ region_b.getRegionInfo().getRegionNameAsString(), e);
return false;
}
// WARN: make sure there is no parent region of the two merging regions in
// hbase:meta If exists, fixing up daughters would cause daughter regions(we
// have merged one) online again when we restart master, so we should clear
// the parent region to prevent the above case
// Since HBASE-7721, we don't need fix up daughters any more. so here do
// nothing
this.mergedRegionInfo = getMergedRegionInfo(region_a.getRegionInfo(),
region_b.getRegionInfo());
transition(RegionMergeTransactionPhase.PREPARED);
return true;
}
@Override
public Region execute(final Server server, final RegionServerServices services)
throws IOException {
this.server = server;
this.rsServices = services;
if (rsCoprocessorHost == null) {
rsCoprocessorHost = server != null ?
((HRegionServer) server).getRegionServerCoprocessorHost() : null;
}
HRegion mergedRegion = createMergedRegion(server, services);
if (rsCoprocessorHost != null) {
rsCoprocessorHost.postMergeCommit(this.region_a, this.region_b, mergedRegion);
}
stepsAfterPONR(server, services, mergedRegion);
transition(RegionMergeTransactionPhase.COMPLETED);
return mergedRegion;
}
@VisibleForTesting
public void stepsAfterPONR(final Server server, final RegionServerServices services,
HRegion mergedRegion) throws IOException {
openMergedRegion(server, services, mergedRegion);
if (rsCoprocessorHost != null) {
rsCoprocessorHost.postMerge(this.region_a, this.region_b, mergedRegion);
}
}
/**
* Prepare the merged region and region files.
* @param server Hosting server instance. Can be null when testing
* @param services Used to online/offline regions.
* @return merged region
* @throws IOException If thrown, transaction failed. Call
* {@link #rollback(Server, RegionServerServices)}
*/
private HRegion createMergedRegion(final Server server, final RegionServerServices services)
throws IOException {
LOG.info("Starting merge of " + region_a + " and "
+ region_b.getRegionInfo().getRegionNameAsString() + ", forcible=" + forcible);
if ((server != null && server.isStopped())
|| (services != null && services.isStopping())) {
throw new IOException("Server is stopped or stopping");
}
if (rsCoprocessorHost != null) {
if (rsCoprocessorHost.preMerge(this.region_a, this.region_b)) {
throw new IOException("Coprocessor bypassing regions " + this.region_a + " "
+ this.region_b + " merge.");
}
}
// If true, no cluster to write meta edits to or to use coordination.
boolean testing = server == null ? true : server.getConfiguration()
.getBoolean("hbase.testing.nocluster", false);
HRegion mergedRegion = stepsBeforePONR(server, services, testing);
@MetaMutationAnnotation
List<Mutation> metaEntries = new ArrayList<Mutation>();
if (rsCoprocessorHost != null) {
if (rsCoprocessorHost.preMergeCommit(this.region_a, this.region_b, metaEntries)) {
throw new IOException("Coprocessor bypassing regions " + this.region_a + " "
+ this.region_b + " merge.");
}
try {
for (Mutation p : metaEntries) {
HRegionInfo.parseRegionName(p.getRow());
}
} catch (IOException e) {
LOG.error("Row key of mutation from coprocessor is not parsable as region name."
+ "Mutations from coprocessor should only be for hbase:meta table.", e);
throw e;
}
}
// This is the point of no return. Similar with SplitTransaction.
// IF we reach the PONR then subsequent failures need to crash out this
// regionserver
transition(RegionMergeTransactionPhase.PONR);
// Add merged region and delete region_a and region_b
// as an atomic update. See HBASE-7721. This update to hbase:meta makes the region
// will determine whether the region is merged or not in case of failures.
// If it is successful, master will roll-forward, if not, master will
// rollback
if (services != null && !services.reportRegionStateTransition(TransitionCode.MERGE_PONR,
mergedRegionInfo, region_a.getRegionInfo(), region_b.getRegionInfo())) {
// Passed PONR, let SSH clean it up
throw new IOException("Failed to notify master that merge passed PONR: "
+ region_a.getRegionInfo().getRegionNameAsString() + " and "
+ region_b.getRegionInfo().getRegionNameAsString());
}
return mergedRegion;
}
@VisibleForTesting
public void prepareMutationsForMerge(HRegionInfo mergedRegion, HRegionInfo regionA,
HRegionInfo regionB, ServerName serverName, List<Mutation> mutations) throws IOException {
HRegionInfo copyOfMerged = new HRegionInfo(mergedRegion);
// Put for parent
Put putOfMerged = MetaTableAccessor.makePutFromRegionInfo(copyOfMerged);
putOfMerged.add(HConstants.CATALOG_FAMILY, HConstants.MERGEA_QUALIFIER,
regionA.toByteArray());
putOfMerged.add(HConstants.CATALOG_FAMILY, HConstants.MERGEB_QUALIFIER,
regionB.toByteArray());
mutations.add(putOfMerged);
// Deletes for merging regions
Delete deleteA = MetaTableAccessor.makeDeleteFromRegionInfo(regionA);
Delete deleteB = MetaTableAccessor.makeDeleteFromRegionInfo(regionB);
mutations.add(deleteA);
mutations.add(deleteB);
// The merged is a new region, openSeqNum = 1 is fine.
addLocation(putOfMerged, serverName, 1);
}
@VisibleForTesting
Put addLocation(final Put p, final ServerName sn, long openSeqNum) {
p.add(HConstants.CATALOG_FAMILY, HConstants.SERVER_QUALIFIER, Bytes
.toBytes(sn.getHostAndPort()));
p.add(HConstants.CATALOG_FAMILY, HConstants.STARTCODE_QUALIFIER, Bytes.toBytes(sn
.getStartcode()));
p.add(HConstants.CATALOG_FAMILY, HConstants.SEQNUM_QUALIFIER, Bytes.toBytes(openSeqNum));
return p;
}
@VisibleForTesting
public HRegion stepsBeforePONR(final Server server, final RegionServerServices services,
boolean testing) throws IOException {
if (services != null && !services.reportRegionStateTransition(TransitionCode.READY_TO_MERGE,
mergedRegionInfo, region_a.getRegionInfo(), region_b.getRegionInfo())) {
throw new IOException("Failed to get ok from master to merge "
+ region_a.getRegionInfo().getRegionNameAsString() + " and "
+ region_b.getRegionInfo().getRegionNameAsString());
}
transition(RegionMergeTransactionPhase.SET_MERGING);
this.region_a.getRegionFileSystem().createMergesDir();
transition(RegionMergeTransactionPhase.CREATED_MERGE_DIR);
Map<byte[], List<StoreFile>> hstoreFilesOfRegionA = closeAndOfflineRegion(
services, this.region_a, true, testing);
Map<byte[], List<StoreFile>> hstoreFilesOfRegionB = closeAndOfflineRegion(
services, this.region_b, false, testing);
assert hstoreFilesOfRegionA != null && hstoreFilesOfRegionB != null;
// mergeStoreFiles creates merged region dirs under the region_a merges dir
// Nothing to unroll here if failure -- clean up of CREATE_MERGE_DIR will
// clean this up.
mergeStoreFiles(hstoreFilesOfRegionA, hstoreFilesOfRegionB);
// Log to the journal that we are creating merged region. We could fail
// halfway through. If we do, we could have left
// stuff in fs that needs cleanup -- a storefile or two. Thats why we
// add entry to journal BEFORE rather than AFTER the change.
transition(RegionMergeTransactionPhase.STARTED_MERGED_REGION_CREATION);
HRegion mergedRegion = createMergedRegionFromMerges(this.region_a,
this.region_b, this.mergedRegionInfo);
return mergedRegion;
}
/**
* Create a merged region from the merges directory under region a. In order
* to mock it for tests, place it with a new method.
* @param a hri of region a
* @param b hri of region b
* @param mergedRegion hri of merged region
* @return merged HRegion.
* @throws IOException
*/
@VisibleForTesting
HRegion createMergedRegionFromMerges(final HRegion a, final HRegion b,
final HRegionInfo mergedRegion) throws IOException {
return a.createMergedRegionFromMerges(mergedRegion, b);
}
/**
* Close the merging region and offline it in regionserver
* @param services
* @param region
* @param isRegionA true if it is merging region a, false if it is region b
* @param testing true if it is testing
* @return a map of family name to list of store files
* @throws IOException
*/
private Map<byte[], List<StoreFile>> closeAndOfflineRegion(
final RegionServerServices services, final HRegion region,
final boolean isRegionA, final boolean testing) throws IOException {
Map<byte[], List<StoreFile>> hstoreFilesToMerge = null;
Exception exceptionToThrow = null;
try {
hstoreFilesToMerge = region.close(false);
} catch (Exception e) {
exceptionToThrow = e;
}
if (exceptionToThrow == null && hstoreFilesToMerge == null) {
// The region was closed by a concurrent thread. We can't continue
// with the merge, instead we must just abandon the merge. If we
// reopen or merge this could cause problems because the region has
// probably already been moved to a different server, or is in the
// process of moving to a different server.
exceptionToThrow = closedByOtherException;
}
if (exceptionToThrow != closedByOtherException) {
transition(isRegionA ? RegionMergeTransactionPhase.CLOSED_REGION_A
: RegionMergeTransactionPhase.CLOSED_REGION_B);
}
if (exceptionToThrow != null) {
if (exceptionToThrow instanceof IOException)
throw (IOException) exceptionToThrow;
throw new IOException(exceptionToThrow);
}
if (!testing) {
services.removeFromOnlineRegions(region, null);
}
transition(isRegionA ? RegionMergeTransactionPhase.OFFLINED_REGION_A
: RegionMergeTransactionPhase.OFFLINED_REGION_B);
return hstoreFilesToMerge;
}
/**
* Get merged region info through the specified two regions
* @param a merging region A
* @param b merging region B
* @return the merged region info
*/
@VisibleForTesting
static HRegionInfo getMergedRegionInfo(final HRegionInfo a, final HRegionInfo b) {
long rid = EnvironmentEdgeManager.currentTime();
// Regionid is timestamp. Merged region's id can't be less than that of
// merging regions else will insert at wrong location in hbase:meta
if (rid < a.getRegionId() || rid < b.getRegionId()) {
LOG.warn("Clock skew; merging regions id are " + a.getRegionId()
+ " and " + b.getRegionId() + ", but current time here is " + rid);
rid = Math.max(a.getRegionId(), b.getRegionId()) + 1;
}
byte[] startKey = null;
byte[] endKey = null;
// Choose the smaller as start key
if (a.compareTo(b) <= 0) {
startKey = a.getStartKey();
} else {
startKey = b.getStartKey();
}
// Choose the bigger as end key
if (Bytes.equals(a.getEndKey(), HConstants.EMPTY_BYTE_ARRAY)
|| (!Bytes.equals(b.getEndKey(), HConstants.EMPTY_BYTE_ARRAY)
&& Bytes.compareTo(a.getEndKey(), b.getEndKey()) > 0)) {
endKey = a.getEndKey();
} else {
endKey = b.getEndKey();
}
// Merged region is sorted between two merging regions in META
HRegionInfo mergedRegionInfo = new HRegionInfo(a.getTable(), startKey,
endKey, false, rid);
return mergedRegionInfo;
}
/**
* Perform time consuming opening of the merged region.
* @param server Hosting server instance. Can be null when testing
* @param services Used to online/offline regions.
* @param merged the merged region
* @throws IOException If thrown, transaction failed. Call
* {@link #rollback(Server, RegionServerServices)}
*/
@VisibleForTesting
void openMergedRegion(final Server server, final RegionServerServices services,
HRegion merged) throws IOException {
boolean stopped = server != null && server.isStopped();
boolean stopping = services != null && services.isStopping();
if (stopped || stopping) {
LOG.info("Not opening merged region " + merged.getRegionInfo().getRegionNameAsString()
+ " because stopping=" + stopping + ", stopped=" + stopped);
return;
}
HRegionInfo hri = merged.getRegionInfo();
LoggingProgressable reporter = server == null ? null
: new LoggingProgressable(hri, server.getConfiguration().getLong(
"hbase.regionserver.regionmerge.open.log.interval", 10000));
merged.openHRegion(reporter);
if (services != null) {
if (!services.reportRegionStateTransition(TransitionCode.MERGED,
mergedRegionInfo, region_a.getRegionInfo(), region_b.getRegionInfo())) {
throw new IOException("Failed to report merged region to master: "
+ mergedRegionInfo.getShortNameToLog());
}
services.addToOnlineRegions(merged);
}
}
/**
* Create reference file(s) of merging regions under the region_a merges dir
* @param hstoreFilesOfRegionA
* @param hstoreFilesOfRegionB
* @throws IOException
*/
private void mergeStoreFiles(
Map<byte[], List<StoreFile>> hstoreFilesOfRegionA,
Map<byte[], List<StoreFile>> hstoreFilesOfRegionB)
throws IOException {
// Create reference file(s) of region A in mergdir
HRegionFileSystem fs_a = this.region_a.getRegionFileSystem();
for (Map.Entry<byte[], List<StoreFile>> entry : hstoreFilesOfRegionA
.entrySet()) {
String familyName = Bytes.toString(entry.getKey());
for (StoreFile storeFile : entry.getValue()) {
fs_a.mergeStoreFile(this.mergedRegionInfo, familyName, storeFile,
this.mergesdir);
}
}
// Create reference file(s) of region B in mergedir
HRegionFileSystem fs_b = this.region_b.getRegionFileSystem();
for (Map.Entry<byte[], List<StoreFile>> entry : hstoreFilesOfRegionB
.entrySet()) {
String familyName = Bytes.toString(entry.getKey());
for (StoreFile storeFile : entry.getValue()) {
fs_b.mergeStoreFile(this.mergedRegionInfo, familyName, storeFile,
this.mergesdir);
}
}
}
@Override
public boolean rollback(final Server server,
final RegionServerServices services) throws IOException {
assert this.mergedRegionInfo != null;
this.server = server;
this.rsServices = services;
// Coprocessor callback
if (rsCoprocessorHost != null) {
rsCoprocessorHost.preRollBackMerge(this.region_a, this.region_b);
}
boolean result = true;
ListIterator<JournalEntry> iterator = this.journal
.listIterator(this.journal.size());
// Iterate in reverse.
while (iterator.hasPrevious()) {
JournalEntry je = iterator.previous();
transition(je.getPhase(), true);
switch (je.getPhase()) {
case SET_MERGING:
if (services != null
&& !services.reportRegionStateTransition(TransitionCode.MERGE_REVERTED,
mergedRegionInfo, region_a.getRegionInfo(), region_b.getRegionInfo())) {
return false;
}
break;
case CREATED_MERGE_DIR:
this.region_a.writestate.writesEnabled = true;
this.region_b.writestate.writesEnabled = true;
this.region_a.getRegionFileSystem().cleanupMergesDir();
break;
case CLOSED_REGION_A:
try {
// So, this returns a seqid but if we just closed and then reopened,
// we should be ok. On close, we flushed using sequenceid obtained
// from hosting regionserver so no need to propagate the sequenceid
// returned out of initialize below up into regionserver as we
// normally do.
this.region_a.initialize();
} catch (IOException e) {
LOG.error("Failed rollbacking CLOSED_REGION_A of region "
+ region_a.getRegionInfo().getRegionNameAsString(), e);
throw new RuntimeException(e);
}
break;
case OFFLINED_REGION_A:
if (services != null)
services.addToOnlineRegions(this.region_a);
break;
case CLOSED_REGION_B:
try {
this.region_b.initialize();
} catch (IOException e) {
LOG.error("Failed rollbacking CLOSED_REGION_A of region "
+ region_b.getRegionInfo().getRegionNameAsString(), e);
throw new RuntimeException(e);
}
break;
case OFFLINED_REGION_B:
if (services != null)
services.addToOnlineRegions(this.region_b);
break;
case STARTED_MERGED_REGION_CREATION:
this.region_a.getRegionFileSystem().cleanupMergedRegion(
this.mergedRegionInfo);
break;
case PONR:
// We got to the point-of-no-return so we need to just abort. Return
// immediately. Do not clean up created merged regions.
return false;
// Informational states only
case STARTED:
case PREPARED:
case COMPLETED:
break;
default:
throw new RuntimeException("Unhandled journal entry: " + je);
}
}
// Coprocessor callback
if (rsCoprocessorHost != null) {
rsCoprocessorHost.postRollBackMerge(this.region_a, this.region_b);
}
return result;
}
@Override
public HRegionInfo getMergedRegionInfo() {
return this.mergedRegionInfo;
}
@VisibleForTesting
Path getMergesDir() {
return this.mergesdir;
}
/**
* Checks if the given region has merge qualifier in hbase:meta
* @param services
* @param regionName name of specified region
* @return true if the given region has merge qualifier in META.(It will be
* cleaned by CatalogJanitor)
* @throws IOException
*/
@VisibleForTesting
boolean hasMergeQualifierInMeta(final RegionServerServices services, final byte[] regionName)
throws IOException {
if (services == null) return false;
// Get merge regions if it is a merged region and already has merge
// qualifier
Pair<HRegionInfo, HRegionInfo> mergeRegions = MetaTableAccessor
.getRegionsFromMergeQualifier(services.getConnection(), regionName);
if (mergeRegions != null &&
(mergeRegions.getFirst() != null || mergeRegions.getSecond() != null)) {
// It has merge qualifier
return true;
}
return false;
}
@Override
public List<JournalEntry> getJournal() {
return journal;
}
@Override
public RegionMergeTransaction registerTransactionListener(TransactionListener listener) {
listeners.add(listener);
return this;
}
@Override
public Server getServer() {
return server;
}
@Override
public RegionServerServices getRegionServerServices() {
return rsServices;
}
}

10
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RegionMergeTransactionImpl.java.rej Normal file
View File

@ -0,0 +1,10 @@
--- hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RegionMergeTransactionImpl.java
+++ hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RegionMergeTransactionImpl.java
@@ -41,6 +41,7 @@
import org.apache.hadoop.hbase.coordination.BaseCoordinatedStateManager;
import org.apache.hadoop.hbase.coordination.RegionMergeCoordination.RegionMergeDetails;
import org.apache.hadoop.hbase.protobuf.generated.RegionServerStatusProtos.RegionStateTransition.TransitionCode;
+import org.apache.hadoop.hbase.regionserver.SplitTransactionImpl.JournalEntryImpl;
import org.apache.hadoop.hbase.regionserver.SplitTransactionImpl.LoggingProgressable;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.ConfigUtil;

2
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/SplitRequest.java
View File

@ -64,7 +64,7 @@ class SplitRequest implements Runnable {
boolean success = false;
server.metricsRegionServer.incrSplitRequest();
long startTime = EnvironmentEdgeManager.currentTime();
SplitTransaction st = new SplitTransaction(parent, midKey);
SplitTransactionImpl st = new SplitTransactionImpl(parent, midKey);
try {
//acquire a shared read lock on the table, so that table schema modifications
//do not happen concurrently

782
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/SplitTransaction.java
View File

@ -1,5 +1,4 @@
/**
*
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
@ -19,93 +18,62 @@
package org.apache.hadoop.hbase.regionserver;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.HBaseInterfaceAudience;
import org.apache.hadoop.hbase.Server;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.client.Mutation;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.protobuf.generated.RegionServerStatusProtos.RegionStateTransition.TransitionCode;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.CancelableProgressable;
import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
import org.apache.hadoop.hbase.util.FSUtils;
import org.apache.hadoop.hbase.util.HasThread;
import org.apache.hadoop.hbase.util.Pair;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.classification.InterfaceStability;
import org.apache.hadoop.hbase.util.PairOfSameType;
import org.apache.zookeeper.KeeperException;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
/**
* Executes region split as a "transaction". Call {@link #prepare()} to setup
* the transaction, {@link #execute(Server, RegionServerServices)} to run the
* transaction and {@link #rollback(Server, RegionServerServices)} to cleanup if execute fails.
*
* <p>Here is an example of how you would use this class:
* <p>Here is an example of how you would use this interface:
* <pre>
* SplitTransaction st = new SplitTransaction(this.conf, parent, midKey)
* SplitTransactionFactory factory = new SplitTransactionFactory(conf);
* SplitTransaction st = factory.create(parent, midKey)
* .registerTransactionListener(new TransactionListener() {
* public void transition(SplitTransaction transaction, SplitTransactionPhase from,
* SplitTransactionPhase to) throws IOException {
* // ...
* }
* public void rollback(SplitTransaction transaction, SplitTransactionPhase from,
* SplitTransactionPhase to) {
* // ...
* }
* });
* if (!st.prepare()) return;
* try {
* st.execute(server, services);
* } catch (IOException ioe) {
* } catch (IOException e) {
* try {
* st.rollback(server, services);
* return;
* } catch (RuntimeException e) {
* myAbortable.abort("Failed split, abort");
* // abort the server
* }
* }
* </Pre>
* <p>This class is not thread safe. Caller needs ensure split is run by
* <p>A split transaction is not thread safe. Callers must ensure a split is run by
* one thread only.
*/
@InterfaceAudience.Private
public class SplitTransaction {
private static final Log LOG = LogFactory.getLog(SplitTransaction.class);
/*
* Region to split
*/
private final HRegion parent;
private HRegionInfo hri_a;
private HRegionInfo hri_b;
private long fileSplitTimeout = 30000;
/*
* Row to split around
*/
private final byte [] splitrow;
@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.COPROC)
@InterfaceStability.Evolving
public interface SplitTransaction {
/**
* Types to add to the transaction journal.
* Each enum is a step in the split transaction. Used to figure how much
* we need to rollback.
* Each enum is a step in the split transaction.
*/
static enum JournalEntryType {
public enum SplitTransactionPhase {
/**
* Started
*/
STARTED,
/**
* Prepared (after table lock)
* Prepared
*/
PREPARED,
/**
@ -148,6 +116,12 @@ public class SplitTransaction {
* Opened the second daughter region
*/
OPENED_REGION_B,
/**
* Point of no return.
* If we got here, then transaction is not recoverable other than by
* crashing out the regionserver.
*/
PONR,
/**
* Before postSplit coprocessor hook
*/
@ -157,327 +131,60 @@ public class SplitTransaction {
*/
AFTER_POST_SPLIT_HOOK,
/**
* Point of no return.
* If we got here, then transaction is not recoverable other than by
* crashing out the regionserver.
* Completed
*/
PONR
}
static class JournalEntry {
private JournalEntryType type;
private long timestamp;
public JournalEntry(JournalEntryType type) {
this(type, EnvironmentEdgeManager.currentTime());
}
public JournalEntry(JournalEntryType type, long timestamp) {
this.type = type;
this.timestamp = timestamp;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append(type);
sb.append(" at ");
sb.append(timestamp);
return sb.toString();
}
}
/*
* Journal of how far the split transaction has progressed.
*/
private final List<JournalEntry> journal = new ArrayList<JournalEntry>();
/**
* Constructor
* @param r Region to split
* @param splitrow Row to split around
*/
public SplitTransaction(final Region r, final byte [] splitrow) {
this.parent = (HRegion)r;
this.splitrow = splitrow;
this.journal.add(new JournalEntry(JournalEntryType.STARTED));
COMPLETED
}
/**
* Does checks on split inputs.
* Split transaction journal entry
*/
public interface JournalEntry {
/** @return the completed phase marked by this journal entry */
SplitTransactionPhase getPhase();
/** @return the time of phase completion */
long getTimeStamp();
}
/**
* Split transaction listener
*/
public interface TransactionListener {
/**
* Invoked when transitioning forward from one transaction phase to another
* @param transaction the transaction
* @param from the current phase
* @param to the next phase
* @throws IOException listener can throw this to abort
*/
void transition(SplitTransaction transaction, SplitTransactionPhase from,
SplitTransactionPhase to) throws IOException;
/**
* Invoked when rolling back a transaction from one transaction phase to the
* previous
* @param transaction the transaction
* @param from the current phase
* @param to the previous phase
*/
void rollback(SplitTransaction transaction, SplitTransactionPhase from,
SplitTransactionPhase to);
}
/**
* Check split inputs and prepare the transaction.
* @return <code>true</code> if the region is splittable else
* <code>false</code> if it is not (e.g. its already closed, etc.).
* @throws IOException
*/
public boolean prepare() {
if (!this.parent.isSplittable()) return false;
// Split key can be null if this region is unsplittable; i.e. has refs.
if (this.splitrow == null) return false;
HRegionInfo hri = this.parent.getRegionInfo();
parent.prepareToSplit();
// Check splitrow.
byte [] startKey = hri.getStartKey();
byte [] endKey = hri.getEndKey();
if (Bytes.equals(startKey, splitrow) ||
!this.parent.getRegionInfo().containsRow(splitrow)) {
LOG.info("Split row is not inside region key range or is equal to " +
"startkey: " + Bytes.toStringBinary(this.splitrow));
return false;
}
long rid = getDaughterRegionIdTimestamp(hri);
this.hri_a = new HRegionInfo(hri.getTable(), startKey, this.splitrow, false, rid);
this.hri_b = new HRegionInfo(hri.getTable(), this.splitrow, endKey, false, rid);
this.journal.add(new JournalEntry(JournalEntryType.PREPARED));
return true;
}
/**
* Calculate daughter regionid to use.
* @param hri Parent {@link HRegionInfo}
* @return Daughter region id (timestamp) to use.
*/
private static long getDaughterRegionIdTimestamp(final HRegionInfo hri) {
long rid = EnvironmentEdgeManager.currentTime();
// Regionid is timestamp. Can't be less than that of parent else will insert
// at wrong location in hbase:meta (See HBASE-710).
if (rid < hri.getRegionId()) {
LOG.warn("Clock skew; parent regions id is " + hri.getRegionId() +
" but current time here is " + rid);
rid = hri.getRegionId() + 1;
}
return rid;
}
private static IOException closedByOtherException = new IOException(
"Failed to close region: already closed by another thread");
/**
* Prepare the regions and region files.
* @param server Hosting server instance. Can be null when testing (won't try
* and update in zk if a null server)
* @param services Used to online/offline regions.
* @throws IOException If thrown, transaction failed.
* Call {@link #rollback(Server, RegionServerServices)}
* @return Regions created
*/
/* package */PairOfSameType<Region> createDaughters(final Server server,
final RegionServerServices services) throws IOException {
LOG.info("Starting split of region " + this.parent);
if ((server != null && server.isStopped()) ||
(services != null && services.isStopping())) {
throw new IOException("Server is stopped or stopping");
}
assert !this.parent.lock.writeLock().isHeldByCurrentThread():
"Unsafe to hold write lock while performing RPCs";
journal.add(new JournalEntry(JournalEntryType.BEFORE_PRE_SPLIT_HOOK));
// Coprocessor callback
if (this.parent.getCoprocessorHost() != null) {
// TODO: Remove one of these
this.parent.getCoprocessorHost().preSplit();
this.parent.getCoprocessorHost().preSplit(this.splitrow);
}
journal.add(new JournalEntry(JournalEntryType.AFTER_PRE_SPLIT_HOOK));
// If true, no cluster to write meta edits to or to update znodes in.
boolean testing = server == null? true:
server.getConfiguration().getBoolean("hbase.testing.nocluster", false);
this.fileSplitTimeout = testing ? this.fileSplitTimeout :
server.getConfiguration().getLong("hbase.regionserver.fileSplitTimeout",
this.fileSplitTimeout);
PairOfSameType<Region> daughterRegions = stepsBeforePONR(server, services, testing);
List<Mutation> metaEntries = new ArrayList<Mutation>();
if (this.parent.getCoprocessorHost() != null) {
if (this.parent.getCoprocessorHost().
preSplitBeforePONR(this.splitrow, metaEntries)) {
throw new IOException("Coprocessor bypassing region "
+ this.parent.getRegionInfo().getRegionNameAsString() + " split.");
}
try {
for (Mutation p : metaEntries) {
HRegionInfo.parseRegionName(p.getRow());
}
} catch (IOException e) {
LOG.error("Row key of mutation from coprossor is not parsable as region name."
+ "Mutations from coprocessor should only for hbase:meta table.");
throw e;
}
}
// This is the point of no return. Adding subsequent edits to .META. as we
// do below when we do the daughter opens adding each to .META. can fail in
// various interesting ways the most interesting of which is a timeout
// BUT the edits all go through (See HBASE-3872). IF we reach the PONR
// then subsequent failures need to crash out this regionserver; the
// server shutdown processing should be able to fix-up the incomplete split.
// The offlined parent will have the daughters as extra columns. If
// we leave the daughter regions in place and do not remove them when we
// crash out, then they will have their references to the parent in place
// still and the server shutdown fixup of .META. will point to these
// regions.
// We should add PONR JournalEntry before offlineParentInMeta,so even if
// OfflineParentInMeta timeout,this will cause regionserver exit,and then
// master ServerShutdownHandler will fix daughter & avoid data loss. (See
// HBase-4562).
this.journal.add(new JournalEntry(JournalEntryType.PONR));
// Edit parent in meta. Offlines parent region and adds splita and splitb
// as an atomic update. See HBASE-7721. This update to META makes the region
// will determine whether the region is split or not in case of failures.
// If it is successful, master will roll-forward, if not, master will rollback
// and assign the parent region.
if (services != null && !services.reportRegionStateTransition(TransitionCode.SPLIT_PONR,
parent.getRegionInfo(), hri_a, hri_b)) {
// Passed PONR, let SSH clean it up
throw new IOException("Failed to notify master that split passed PONR: "
+ parent.getRegionInfo().getRegionNameAsString());
}
return daughterRegions;
}
public PairOfSameType<Region> stepsBeforePONR(final Server server,
final RegionServerServices services, boolean testing) throws IOException {
if (services != null && !services.reportRegionStateTransition(TransitionCode.READY_TO_SPLIT,
parent.getRegionInfo(), hri_a, hri_b)) {
throw new IOException("Failed to get ok from master to split "
+ parent.getRegionInfo().getRegionNameAsString());
}
this.journal.add(new JournalEntry(JournalEntryType.SET_SPLITTING));
this.parent.getRegionFileSystem().createSplitsDir();
this.journal.add(new JournalEntry(JournalEntryType.CREATE_SPLIT_DIR));
Map<byte[], List<StoreFile>> hstoreFilesToSplit = null;
Exception exceptionToThrow = null;
try{
hstoreFilesToSplit = this.parent.close(false);
} catch (Exception e) {
exceptionToThrow = e;
}
if (exceptionToThrow == null && hstoreFilesToSplit == null) {
// The region was closed by a concurrent thread. We can't continue
// with the split, instead we must just abandon the split. If we
// reopen or split this could cause problems because the region has
// probably already been moved to a different server, or is in the
// process of moving to a different server.
exceptionToThrow = closedByOtherException;
}
if (exceptionToThrow != closedByOtherException) {
this.journal.add(new JournalEntry(JournalEntryType.CLOSED_PARENT_REGION));
}
if (exceptionToThrow != null) {
if (exceptionToThrow instanceof IOException) throw (IOException)exceptionToThrow;
throw new IOException(exceptionToThrow);
}
if (!testing) {
services.removeFromOnlineRegions(this.parent, null);
}
this.journal.add(new JournalEntry(JournalEntryType.OFFLINED_PARENT));
// TODO: If splitStoreFiles were multithreaded would we complete steps in
// less elapsed time? St.Ack 20100920
//
// splitStoreFiles creates daughter region dirs under the parent splits dir
// Nothing to unroll here if failure -- clean up of CREATE_SPLIT_DIR will
// clean this up.
Pair<Integer, Integer> expectedReferences = splitStoreFiles(hstoreFilesToSplit);
// Log to the journal that we are creating region A, the first daughter
// region. We could fail halfway through. If we do, we could have left
// stuff in fs that needs cleanup -- a storefile or two. Thats why we
// add entry to journal BEFORE rather than AFTER the change.
this.journal.add(new JournalEntry(JournalEntryType.STARTED_REGION_A_CREATION));
assertReferenceFileCount(expectedReferences.getFirst(),
this.parent.getRegionFileSystem().getSplitsDir(this.hri_a));
Region a = this.parent.createDaughterRegionFromSplits(this.hri_a);
assertReferenceFileCount(expectedReferences.getFirst(),
new Path(this.parent.getRegionFileSystem().getTableDir(), this.hri_a.getEncodedName()));
// Ditto
this.journal.add(new JournalEntry(JournalEntryType.STARTED_REGION_B_CREATION));
assertReferenceFileCount(expectedReferences.getSecond(),
this.parent.getRegionFileSystem().getSplitsDir(this.hri_b));
Region b = this.parent.createDaughterRegionFromSplits(this.hri_b);
assertReferenceFileCount(expectedReferences.getSecond(),
new Path(this.parent.getRegionFileSystem().getTableDir(), this.hri_b.getEncodedName()));
return new PairOfSameType<Region>(a, b);
}
void assertReferenceFileCount(int expectedReferenceFileCount, Path dir)
throws IOException {
if (expectedReferenceFileCount != 0 &&
expectedReferenceFileCount != FSUtils.getRegionReferenceFileCount(this.parent.getFilesystem(), dir)) {
throw new IOException("Failing split. Expected reference file count isn't equal.");
}
}
/**
* Perform time consuming opening of the daughter regions.
* @param server Hosting server instance. Can be null when testing
* @param services Used to online/offline regions.
* @param a first daughter region
* @param a second daughter region
* @throws IOException If thrown, transaction failed.
* Call {@link #rollback(Server, RegionServerServices)}
*/
/* package */void openDaughters(final Server server,
final RegionServerServices services, Region a, Region b)
throws IOException {
boolean stopped = server != null && server.isStopped();
boolean stopping = services != null && services.isStopping();
// TODO: Is this check needed here?
if (stopped || stopping) {
LOG.info("Not opening daughters " +
b.getRegionInfo().getRegionNameAsString() +
" and " +
a.getRegionInfo().getRegionNameAsString() +
" because stopping=" + stopping + ", stopped=" + stopped);
} else {
// Open daughters in parallel.
DaughterOpener aOpener = new DaughterOpener(server, (HRegion)a);
DaughterOpener bOpener = new DaughterOpener(server, (HRegion)b);
aOpener.start();
bOpener.start();
try {
aOpener.join();
if (aOpener.getException() == null) {
journal.add(new JournalEntry(JournalEntryType.OPENED_REGION_A));
}
bOpener.join();
if (bOpener.getException() == null) {
journal.add(new JournalEntry(JournalEntryType.OPENED_REGION_B));
}
} catch (InterruptedException e) {
throw (InterruptedIOException)new InterruptedIOException().initCause(e);
}
if (aOpener.getException() != null) {
throw new IOException("Failed " +
aOpener.getName(), aOpener.getException());
}
if (bOpener.getException() != null) {
throw new IOException("Failed " +
bOpener.getName(), bOpener.getException());
}
if (services != null) {
if (!services.reportRegionStateTransition(TransitionCode.SPLIT,
parent.getRegionInfo(), hri_a, hri_b)) {
throw new IOException("Failed to report split region to master: "
+ parent.getRegionInfo().getShortNameToLog());
}
// Should add it to OnlineRegions
services.addToOnlineRegions(b);
services.addToOnlineRegions(a);
}
}
}
boolean prepare() throws IOException;
/**
* Run the transaction.
* @param server Hosting server instance. Can be null when testing
* @param server Hosting server instance. Can be null when testing.
* @param services Used to online/offline regions.
* @throws IOException If thrown, transaction failed.
* Call {@link #rollback(Server, RegionServerServices)}
@ -485,325 +192,44 @@ public class SplitTransaction {
* @throws IOException
* @see #rollback(Server, RegionServerServices)
*/
public PairOfSameType<Region> execute(final Server server,
final RegionServerServices services)
throws IOException {
PairOfSameType<Region> regions = createDaughters(server, services);
if (this.parent.getCoprocessorHost() != null) {
this.parent.getCoprocessorHost().preSplitAfterPONR();
}
return stepsAfterPONR(server, services, regions);
}
public PairOfSameType<Region> stepsAfterPONR(final Server server,
final RegionServerServices services, PairOfSameType<Region> regions)
throws IOException {
openDaughters(server, services, regions.getFirst(), regions.getSecond());
journal.add(new JournalEntry(JournalEntryType.BEFORE_POST_SPLIT_HOOK));
// Coprocessor callback
if (parent.getCoprocessorHost() != null) {
parent.getCoprocessorHost().postSplit(regions.getFirst(), regions.getSecond());
}
journal.add(new JournalEntry(JournalEntryType.AFTER_POST_SPLIT_HOOK));
return regions;
}
public Put addLocation(final Put p, final ServerName sn, long openSeqNum) {
p.addImmutable(HConstants.CATALOG_FAMILY, HConstants.SERVER_QUALIFIER,
Bytes.toBytes(sn.getHostAndPort()));
p.addImmutable(HConstants.CATALOG_FAMILY, HConstants.STARTCODE_QUALIFIER,
Bytes.toBytes(sn.getStartcode()));
p.addImmutable(HConstants.CATALOG_FAMILY, HConstants.SEQNUM_QUALIFIER,
Bytes.toBytes(openSeqNum));
return p;
}
/*
* Open daughter region in its own thread.
* If we fail, abort this hosting server.
*/
class DaughterOpener extends HasThread {
private final Server server;
private final HRegion r;
private Throwable t = null;
DaughterOpener(final Server s, final HRegion r) {
super((s == null? "null-services": s.getServerName()) +
"-daughterOpener=" + r.getRegionInfo().getEncodedName());
setDaemon(true);
this.server = s;
this.r = r;
}
/**
* @return Null if open succeeded else exception that causes us fail open.
* Call it after this thread exits else you may get wrong view on result.
*/
Throwable getException() {
return this.t;
}
@Override
public void run() {
try {
openDaughterRegion(this.server, r);
} catch (Throwable t) {
this.t = t;
}
}
}
/**
* Open daughter regions, add them to online list and update meta.
* @param server
* @param daughter
* @throws IOException
* @throws KeeperException
*/
void openDaughterRegion(final Server server, final HRegion daughter)
throws IOException, KeeperException {
HRegionInfo hri = daughter.getRegionInfo();
LoggingProgressable reporter = server == null ? null
: new LoggingProgressable(hri, server.getConfiguration().getLong(
"hbase.regionserver.split.daughter.open.log.interval", 10000));
daughter.openHRegion(reporter);
}
static class LoggingProgressable implements CancelableProgressable {
private final HRegionInfo hri;
private long lastLog = -1;
private final long interval;
LoggingProgressable(final HRegionInfo hri, final long interval) {
this.hri = hri;
this.interval = interval;
}
@Override
public boolean progress() {
long now = EnvironmentEdgeManager.currentTime();
if (now - lastLog > this.interval) {
LOG.info("Opening " + this.hri.getRegionNameAsString());
this.lastLog = now;
}
return true;
}
}
/**
* Creates reference files for top and bottom half of the
* @param hstoreFilesToSplit map of store files to create half file references for.
* @return the number of reference files that were created.
* @throws IOException
*/
private Pair<Integer, Integer> splitStoreFiles(
final Map<byte[], List<StoreFile>> hstoreFilesToSplit)
throws IOException {
if (hstoreFilesToSplit == null) {
// Could be null because close didn't succeed -- for now consider it fatal
throw new IOException("Close returned empty list of StoreFiles");
}
// The following code sets up a thread pool executor with as many slots as
// there's files to split. It then fires up everything, waits for
// completion and finally checks for any exception
int nbFiles = hstoreFilesToSplit.size();
if (nbFiles == 0) {
// no file needs to be splitted.
return new Pair<Integer, Integer>(0,0);
}
LOG.info("Preparing to split " + nbFiles + " storefiles for region " + this.parent);
ThreadFactoryBuilder builder = new ThreadFactoryBuilder();
builder.setNameFormat("StoreFileSplitter-%1$d");
ThreadFactory factory = builder.build();
ThreadPoolExecutor threadPool =
(ThreadPoolExecutor) Executors.newFixedThreadPool(nbFiles, factory);
List<Future<Pair<Path,Path>>> futures = new ArrayList<Future<Pair<Path,Path>>> (nbFiles);
// Split each store file.
for (Map.Entry<byte[], List<StoreFile>> entry: hstoreFilesToSplit.entrySet()) {
for (StoreFile sf: entry.getValue()) {
StoreFileSplitter sfs = new StoreFileSplitter(entry.getKey(), sf);
futures.add(threadPool.submit(sfs));
}
}
// Shutdown the pool
threadPool.shutdown();
// Wait for all the tasks to finish
try {
boolean stillRunning = !threadPool.awaitTermination(
this.fileSplitTimeout, TimeUnit.MILLISECONDS);
if (stillRunning) {
threadPool.shutdownNow();
// wait for the thread to shutdown completely.
while (!threadPool.isTerminated()) {
Thread.sleep(50);
}
throw new IOException("Took too long to split the" +
" files and create the references, aborting split");
}
} catch (InterruptedException e) {
throw (InterruptedIOException)new InterruptedIOException().initCause(e);
}
int created_a = 0;
int created_b = 0;
// Look for any exception
for (Future<Pair<Path, Path>> future : futures) {
try {
Pair<Path, Path> p = future.get();
created_a += p.getFirst() != null ? 1 : 0;
created_b += p.getSecond() != null ? 1 : 0;
} catch (InterruptedException e) {
throw (InterruptedIOException) new InterruptedIOException().initCause(e);
} catch (ExecutionException e) {
throw new IOException(e);
}
}
if (LOG.isDebugEnabled()) {
LOG.debug("Split storefiles for region " + this.parent + " Daugther A: " + created_a
+ " storefiles, Daugther B: " + created_b + " storefiles.");
}
return new Pair<Integer, Integer>(created_a, created_b);
}
private Pair<Path, Path> splitStoreFile(final byte[] family, final StoreFile sf) throws IOException {
HRegionFileSystem fs = this.parent.getRegionFileSystem();
String familyName = Bytes.toString(family);
Path path_a =
fs.splitStoreFile(this.hri_a, familyName, sf, this.splitrow, false,
this.parent.getSplitPolicy());
Path path_b =
fs.splitStoreFile(this.hri_b, familyName, sf, this.splitrow, true,
this.parent.getSplitPolicy());
return new Pair<Path,Path>(path_a, path_b);
}
/**
* Utility class used to do the file splitting / reference writing
* in parallel instead of sequentially.
*/
class StoreFileSplitter implements Callable<Pair<Path,Path>> {
private final byte[] family;
private final StoreFile sf;
/**
* Constructor that takes what it needs to split
* @param family Family that contains the store file
* @param sf which file
*/
public StoreFileSplitter(final byte[] family, final StoreFile sf) {
this.sf = sf;
this.family = family;
}
public Pair<Path,Path> call() throws IOException {
return splitStoreFile(family, sf);
}
}
PairOfSameType<Region> execute(Server server, RegionServerServices services) throws IOException;
/**
* Roll back a failed transaction
* @param server Hosting server instance (May be null when testing).
* @param services
* @throws IOException If thrown, rollback failed. Take drastic action.
* @return True if we successfully rolled back, false if we got to the point
* of no return and so now need to abort the server to minimize damage.
*/
@SuppressWarnings("deprecation")
public boolean rollback(final Server server, final RegionServerServices services)
throws IOException {
// Coprocessor callback
if (this.parent.getCoprocessorHost() != null) {
this.parent.getCoprocessorHost().preRollBackSplit();
}
boolean rollback(Server server, RegionServerServices services) throws IOException;
boolean result = true;
ListIterator<JournalEntry> iterator =
this.journal.listIterator(this.journal.size());
// Iterate in reverse.
while (iterator.hasPrevious()) {
JournalEntry je = iterator.previous();
switch(je.type) {
/**
* Register a listener for transaction preparation, execution, and possibly
* rollback phases.
* <p>A listener can abort a transaction by throwing an exception.
* @param listener the listener
* @return 'this' for chaining
*/
SplitTransaction registerTransactionListener(TransactionListener listener);
case SET_SPLITTING:
if (services != null
&& !services.reportRegionStateTransition(TransitionCode.SPLIT_REVERTED,
parent.getRegionInfo(), hri_a, hri_b)) {
return false;
}
break;
/**
* Get the journal for the transaction.
* <p>Journal entries are an opaque type represented as JournalEntry. They can
* also provide useful debugging information via their toString method.
* @return the transaction journal
*/
List<JournalEntry> getJournal();
case CREATE_SPLIT_DIR:
this.parent.writestate.writesEnabled = true;
this.parent.getRegionFileSystem().cleanupSplitsDir();
break;
/**
* Get the Server running the transaction or rollback
* @return server instance
*/
Server getServer();
case CLOSED_PARENT_REGION:
try {
// So, this returns a seqid but if we just closed and then reopened, we
// should be ok. On close, we flushed using sequenceid obtained from
// hosting regionserver so no need to propagate the sequenceid returned
// out of initialize below up into regionserver as we normally do.
// TODO: Verify.
this.parent.initialize();
} catch (IOException e) {
LOG.error("Failed rollbacking CLOSED_PARENT_REGION of region " +
this.parent.getRegionInfo().getRegionNameAsString(), e);
throw new RuntimeException(e);
}
break;
case STARTED_REGION_A_CREATION:
this.parent.getRegionFileSystem().cleanupDaughterRegion(this.hri_a);
break;
case STARTED_REGION_B_CREATION:
this.parent.getRegionFileSystem().cleanupDaughterRegion(this.hri_b);
break;
case OFFLINED_PARENT:
if (services != null) services.addToOnlineRegions(this.parent);
break;
case PONR:
// We got to the point-of-no-return so we need to just abort. Return
// immediately. Do not clean up created daughter regions. They need
// to be in place so we don't delete the parent region mistakenly.
// See HBASE-3872.
return false;
// Informational only cases
case STARTED:
case PREPARED:
case BEFORE_PRE_SPLIT_HOOK:
case AFTER_PRE_SPLIT_HOOK:
case BEFORE_POST_SPLIT_HOOK:
case AFTER_POST_SPLIT_HOOK:
case OPENED_REGION_A:
case OPENED_REGION_B:
break;
default:
throw new RuntimeException("Unhandled journal entry: " + je);
}
}
// Coprocessor callback
if (this.parent.getCoprocessorHost() != null) {
this.parent.getCoprocessorHost().postRollBackSplit();
}
return result;
}
HRegionInfo getFirstDaughter() {
return hri_a;
}
HRegionInfo getSecondDaughter() {
return hri_b;
}
List<JournalEntry> getJournal() {
return journal;
}
/**
* Get the RegonServerServices of the server running the transaction or rollback
* @return region server services
*/
RegionServerServices getRegionServerServices();
}

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@ -0,0 +1,74 @@
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hbase.regionserver;
import org.apache.hadoop.conf.Configurable;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseInterfaceAudience;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.classification.InterfaceStability;
import org.apache.hadoop.hbase.util.ReflectionUtils;
/**
* A factory for creating SplitTransactions, which execute region split as a "transaction".
* See {@link SplitTransaction}
*/
@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.COPROC)
@InterfaceStability.Evolving
public class SplitTransactionFactory implements Configurable {
public static final String SPLIT_TRANSACTION_IMPL_KEY =
"hbase.regionserver.split.transaction.impl";
private Configuration conf;
public SplitTransactionFactory(Configuration conf) {
this.conf = conf;
}
@Override
public Configuration getConf() {
return conf;
}
@Override
public void setConf(Configuration conf) {
this.conf = conf;
}
/**
* Create a split transaction
* @param r the region to split
* @param splitrow the split point in the keyspace
* @return transaction instance
*/
public SplitTransaction create(final Region r, final byte [] splitrow) {
return ReflectionUtils.instantiateWithCustomCtor(
// The implementation class must extend SplitTransactionImpl, not only
// implement the SplitTransaction interface like you might expect,
// because various places such as AssignmentManager use static methods
// from SplitTransactionImpl. Whatever we use for implementation must
// be compatible, so it's safest to require ? extends SplitTransactionImpl.
// If not compatible we will throw a runtime exception from here.
conf.getClass(SPLIT_TRANSACTION_IMPL_KEY, SplitTransactionImpl.class,
SplitTransactionImpl.class).getName(),
new Class[] { Region.class, byte[].class },
new Object[] { r, splitrow });
}
}

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/**
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hbase.regionserver;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.Server;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.client.Mutation;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.protobuf.generated.RegionServerStatusProtos.RegionStateTransition.TransitionCode;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.CancelableProgressable;
import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
import org.apache.hadoop.hbase.util.FSUtils;
import org.apache.hadoop.hbase.util.HasThread;
import org.apache.hadoop.hbase.util.Pair;
import org.apache.hadoop.hbase.util.PairOfSameType;
import org.apache.zookeeper.KeeperException;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
@InterfaceAudience.Private
public class SplitTransactionImpl implements SplitTransaction {
private static final Log LOG = LogFactory.getLog(SplitTransactionImpl.class);
/*
* Region to split
*/
private final HRegion parent;
private HRegionInfo hri_a;
private HRegionInfo hri_b;
private long fileSplitTimeout = 30000;
/*
* Row to split around
*/
private final byte [] splitrow;
/*
* Transaction state for listener, only valid during execute and
* rollback
*/
private SplitTransactionPhase currentPhase = SplitTransactionPhase.STARTED;
private Server server;
private RegionServerServices rsServices;
public static class JournalEntryImpl implements JournalEntry {
private SplitTransactionPhase type;
private long timestamp;
public JournalEntryImpl(SplitTransactionPhase type) {
this(type, EnvironmentEdgeManager.currentTime());
}
public JournalEntryImpl(SplitTransactionPhase type, long timestamp) {
this.type = type;
this.timestamp = timestamp;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append(type);
sb.append(" at ");
sb.append(timestamp);
return sb.toString();
}
@Override
public SplitTransactionPhase getPhase() {
return type;
}
@Override
public long getTimeStamp() {
return timestamp;
}
}
/*
* Journal of how far the split transaction has progressed.
*/
private final ArrayList<JournalEntry> journal = new ArrayList<JournalEntry>();
/**
* Listeners
*/
private final ArrayList<TransactionListener> listeners = new ArrayList<TransactionListener>();
/**
* Constructor
* @param r Region to split
* @param splitrow Row to split around
*/
public SplitTransactionImpl(final Region r, final byte [] splitrow) {
this.parent = (HRegion)r;
this.splitrow = splitrow;
this.journal.add(new JournalEntryImpl(SplitTransactionPhase.STARTED));
}
private void transition(SplitTransactionPhase nextPhase) throws IOException {
transition(nextPhase, false);
}
private void transition(SplitTransactionPhase nextPhase, boolean isRollback)
throws IOException {
if (!isRollback) {
// Add to the journal first, because if the listener throws an exception
// we need to roll back starting at 'nextPhase'
this.journal.add(new JournalEntryImpl(nextPhase));
}
for (int i = 0; i < listeners.size(); i++) {
TransactionListener listener = listeners.get(i);
if (!isRollback) {
listener.transition(this, currentPhase, nextPhase);
} else {
listener.rollback(this, currentPhase, nextPhase);
}
}
currentPhase = nextPhase;
}
@Override
public boolean prepare() throws IOException {
if (!this.parent.isSplittable()) return false;
// Split key can be null if this region is unsplittable; i.e. has refs.
if (this.splitrow == null) return false;
HRegionInfo hri = this.parent.getRegionInfo();
parent.prepareToSplit();
// Check splitrow.
byte [] startKey = hri.getStartKey();
byte [] endKey = hri.getEndKey();
if (Bytes.equals(startKey, splitrow) ||
!this.parent.getRegionInfo().containsRow(splitrow)) {
LOG.info("Split row is not inside region key range or is equal to " +
"startkey: " + Bytes.toStringBinary(this.splitrow));
return false;
}
long rid = getDaughterRegionIdTimestamp(hri);
this.hri_a = new HRegionInfo(hri.getTable(), startKey, this.splitrow, false, rid);
this.hri_b = new HRegionInfo(hri.getTable(), this.splitrow, endKey, false, rid);
transition(SplitTransactionPhase.PREPARED);
return true;
}
/**
* Calculate daughter regionid to use.
* @param hri Parent {@link HRegionInfo}
* @return Daughter region id (timestamp) to use.
*/
private static long getDaughterRegionIdTimestamp(final HRegionInfo hri) {
long rid = EnvironmentEdgeManager.currentTime();
// Regionid is timestamp. Can't be less than that of parent else will insert
// at wrong location in hbase:meta (See HBASE-710).
if (rid < hri.getRegionId()) {
LOG.warn("Clock skew; parent regions id is " + hri.getRegionId() +
" but current time here is " + rid);
rid = hri.getRegionId() + 1;
}
return rid;
}
private static IOException closedByOtherException = new IOException(
"Failed to close region: already closed by another thread");
/**
* Prepare the regions and region files.
* @param server Hosting server instance. Can be null when testing (won't try
* and update in zk if a null server)
* @param services Used to online/offline regions.
* @throws IOException If thrown, transaction failed.
* Call {@link #rollback(Server, RegionServerServices)}
* @return Regions created
*/
@VisibleForTesting
PairOfSameType<Region> createDaughters(final Server server,
final RegionServerServices services) throws IOException {
LOG.info("Starting split of region " + this.parent);
if ((server != null && server.isStopped()) ||
(services != null && services.isStopping())) {
throw new IOException("Server is stopped or stopping");
}
assert !this.parent.lock.writeLock().isHeldByCurrentThread():
"Unsafe to hold write lock while performing RPCs";
transition(SplitTransactionPhase.BEFORE_PRE_SPLIT_HOOK);
// Coprocessor callback
if (this.parent.getCoprocessorHost() != null) {
// TODO: Remove one of these
this.parent.getCoprocessorHost().preSplit();
this.parent.getCoprocessorHost().preSplit(this.splitrow);
}
transition(SplitTransactionPhase.AFTER_PRE_SPLIT_HOOK);
// If true, no cluster to write meta edits to or to update znodes in.
boolean testing = server == null? true:
server.getConfiguration().getBoolean("hbase.testing.nocluster", false);
this.fileSplitTimeout = testing ? this.fileSplitTimeout :
server.getConfiguration().getLong("hbase.regionserver.fileSplitTimeout",
this.fileSplitTimeout);
PairOfSameType<Region> daughterRegions = stepsBeforePONR(server, services, testing);
List<Mutation> metaEntries = new ArrayList<Mutation>();
if (this.parent.getCoprocessorHost() != null) {
if (this.parent.getCoprocessorHost().
preSplitBeforePONR(this.splitrow, metaEntries)) {
throw new IOException("Coprocessor bypassing region "
+ parent.getRegionInfo().getRegionNameAsString() + " split.");
}
try {
for (Mutation p : metaEntries) {
HRegionInfo.parseRegionName(p.getRow());
}
} catch (IOException e) {
LOG.error("Row key of mutation from coprossor is not parsable as region name."
+ "Mutations from coprocessor should only for hbase:meta table.");
throw e;
}
}
// This is the point of no return. Adding subsequent edits to .META. as we
// do below when we do the daughter opens adding each to .META. can fail in
// various interesting ways the most interesting of which is a timeout
// BUT the edits all go through (See HBASE-3872). IF we reach the PONR
// then subsequent failures need to crash out this regionserver; the
// server shutdown processing should be able to fix-up the incomplete split.
// The offlined parent will have the daughters as extra columns. If
// we leave the daughter regions in place and do not remove them when we
// crash out, then they will have their references to the parent in place
// still and the server shutdown fixup of .META. will point to these
// regions.
// We should add PONR JournalEntry before offlineParentInMeta,so even if
// OfflineParentInMeta timeout,this will cause regionserver exit,and then
// master ServerShutdownHandler will fix daughter & avoid data loss. (See
// HBase-4562).
transition(SplitTransactionPhase.PONR);
// Edit parent in meta. Offlines parent region and adds splita and splitb
// as an atomic update. See HBASE-7721. This update to META makes the region
// will determine whether the region is split or not in case of failures.
// If it is successful, master will roll-forward, if not, master will rollback
// and assign the parent region.
if (services != null && !services.reportRegionStateTransition(TransitionCode.SPLIT_PONR,
parent.getRegionInfo(), hri_a, hri_b)) {
// Passed PONR, let SSH clean it up
throw new IOException("Failed to notify master that split passed PONR: "
+ parent.getRegionInfo().getRegionNameAsString());
}
return daughterRegions;
}
@VisibleForTesting
Put addLocation(final Put p, final ServerName sn, long openSeqNum) {
p.add(HConstants.CATALOG_FAMILY, HConstants.SERVER_QUALIFIER, Bytes
.toBytes(sn.getHostAndPort()));
p.add(HConstants.CATALOG_FAMILY, HConstants.STARTCODE_QUALIFIER, Bytes.toBytes(sn
.getStartcode()));
p.add(HConstants.CATALOG_FAMILY, HConstants.SEQNUM_QUALIFIER, Bytes.toBytes(openSeqNum));
return p;
}
@VisibleForTesting
public PairOfSameType<Region> stepsBeforePONR(final Server server,
final RegionServerServices services, boolean testing) throws IOException {
if (services != null && !services.reportRegionStateTransition(TransitionCode.READY_TO_SPLIT,
parent.getRegionInfo(), hri_a, hri_b)) {
throw new IOException("Failed to get ok from master to split "
+ parent.getRegionInfo().getRegionNameAsString());
}
transition(SplitTransactionPhase.SET_SPLITTING);
this.parent.getRegionFileSystem().createSplitsDir();
transition(SplitTransactionPhase.CREATE_SPLIT_DIR);
Map<byte[], List<StoreFile>> hstoreFilesToSplit = null;
Exception exceptionToThrow = null;
try{
hstoreFilesToSplit = this.parent.close(false);
} catch (Exception e) {
exceptionToThrow = e;
}
if (exceptionToThrow == null && hstoreFilesToSplit == null) {
// The region was closed by a concurrent thread. We can't continue
// with the split, instead we must just abandon the split. If we
// reopen or split this could cause problems because the region has
// probably already been moved to a different server, or is in the
// process of moving to a different server.
exceptionToThrow = closedByOtherException;
}
if (exceptionToThrow != closedByOtherException) {
transition(SplitTransactionPhase.CLOSED_PARENT_REGION);
}
if (exceptionToThrow != null) {
if (exceptionToThrow instanceof IOException) throw (IOException)exceptionToThrow;
throw new IOException(exceptionToThrow);
}
if (!testing) {
services.removeFromOnlineRegions(this.parent, null);
}
transition(SplitTransactionPhase.OFFLINED_PARENT);
// TODO: If splitStoreFiles were multithreaded would we complete steps in
// less elapsed time? St.Ack 20100920
//
// splitStoreFiles creates daughter region dirs under the parent splits dir
// Nothing to unroll here if failure -- clean up of CREATE_SPLIT_DIR will
// clean this up.
Pair<Integer, Integer> expectedReferences = splitStoreFiles(hstoreFilesToSplit);
// Log to the journal that we are creating region A, the first daughter
// region. We could fail halfway through. If we do, we could have left
// stuff in fs that needs cleanup -- a storefile or two. Thats why we
// add entry to journal BEFORE rather than AFTER the change.
transition(SplitTransactionPhase.STARTED_REGION_A_CREATION);
assertReferenceFileCount(expectedReferences.getFirst(),
this.parent.getRegionFileSystem().getSplitsDir(this.hri_a));
HRegion a = this.parent.createDaughterRegionFromSplits(this.hri_a);
assertReferenceFileCount(expectedReferences.getFirst(),
new Path(this.parent.getRegionFileSystem().getTableDir(), this.hri_a.getEncodedName()));
// Ditto
transition(SplitTransactionPhase.STARTED_REGION_B_CREATION);
assertReferenceFileCount(expectedReferences.getSecond(),
this.parent.getRegionFileSystem().getSplitsDir(this.hri_b));
HRegion b = this.parent.createDaughterRegionFromSplits(this.hri_b);
assertReferenceFileCount(expectedReferences.getSecond(),
new Path(this.parent.getRegionFileSystem().getTableDir(), this.hri_b.getEncodedName()));
return new PairOfSameType<Region>(a, b);
}
@VisibleForTesting
void assertReferenceFileCount(int expectedReferenceFileCount, Path dir)
throws IOException {
if (expectedReferenceFileCount != 0 &&
expectedReferenceFileCount != FSUtils.getRegionReferenceFileCount(parent.getFilesystem(),
dir)) {
throw new IOException("Failing split. Expected reference file count isn't equal.");
}
}
/**
* Perform time consuming opening of the daughter regions.
* @param server Hosting server instance. Can be null when testing
* @param services Used to online/offline regions.
* @param a first daughter region
* @param a second daughter region
* @throws IOException If thrown, transaction failed.
* Call {@link #rollback(Server, RegionServerServices)}
*/
@VisibleForTesting
void openDaughters(final Server server, final RegionServerServices services, Region a,
Region b) throws IOException {
boolean stopped = server != null && server.isStopped();
boolean stopping = services != null && services.isStopping();
// TODO: Is this check needed here?
if (stopped || stopping) {
LOG.info("Not opening daughters " +
b.getRegionInfo().getRegionNameAsString() +
" and " +
a.getRegionInfo().getRegionNameAsString() +
" because stopping=" + stopping + ", stopped=" + stopped);
} else {
// Open daughters in parallel.
DaughterOpener aOpener = new DaughterOpener(server, a);
DaughterOpener bOpener = new DaughterOpener(server, b);
aOpener.start();
bOpener.start();
try {
aOpener.join();
if (aOpener.getException() == null) {
transition(SplitTransactionPhase.OPENED_REGION_A);
}
bOpener.join();
if (bOpener.getException() == null) {
transition(SplitTransactionPhase.OPENED_REGION_B);
}
} catch (InterruptedException e) {
throw (InterruptedIOException)new InterruptedIOException().initCause(e);
}
if (aOpener.getException() != null) {
throw new IOException("Failed " +
aOpener.getName(), aOpener.getException());
}
if (bOpener.getException() != null) {
throw new IOException("Failed " +
bOpener.getName(), bOpener.getException());
}
if (services != null) {
if (!services.reportRegionStateTransition(TransitionCode.SPLIT,
parent.getRegionInfo(), hri_a, hri_b)) {
throw new IOException("Failed to report split region to master: "
+ parent.getRegionInfo().getShortNameToLog());
}
// Should add it to OnlineRegions
services.addToOnlineRegions(b);
services.addToOnlineRegions(a);
}
}
}
@Override
public PairOfSameType<Region> execute(final Server server, final RegionServerServices services)
throws IOException {
this.server = server;
this.rsServices = services;
PairOfSameType<Region> regions = createDaughters(server, services);
stepsAfterPONR(server, services, regions);
transition(SplitTransactionPhase.COMPLETED);
return regions;
}
@VisibleForTesting
void stepsAfterPONR(final Server server,
final RegionServerServices services, PairOfSameType<Region> regions)
throws IOException {
if (this.parent.getCoprocessorHost() != null) {
this.parent.getCoprocessorHost().preSplitAfterPONR();
}
openDaughters(server, services, regions.getFirst(), regions.getSecond());
transition(SplitTransactionPhase.BEFORE_POST_SPLIT_HOOK);
// Coprocessor callback
if (parent.getCoprocessorHost() != null) {
parent.getCoprocessorHost().postSplit(regions.getFirst(), regions.getSecond());
}
transition(SplitTransactionPhase.AFTER_POST_SPLIT_HOOK);
}
/*
* Open daughter region in its own thread.
* If we fail, abort this hosting server.
*/
private class DaughterOpener extends HasThread {
private final Server server;
private final Region r;
private Throwable t = null;
DaughterOpener(final Server s, final Region r) {
super((s == null? "null-services": s.getServerName()) +
"-daughterOpener=" + r.getRegionInfo().getEncodedName());
setDaemon(true);
this.server = s;
this.r = r;
}
/**
* @return Null if open succeeded else exception that causes us fail open.
* Call it after this thread exits else you may get wrong view on result.
*/
Throwable getException() {
return this.t;
}
@Override
public void run() {
try {
openDaughterRegion(this.server, r);
} catch (Throwable t) {
this.t = t;
}
}
}
/**
* Open daughter regions, add them to online list and update meta.
* @param server
* @param daughter
* @throws IOException
* @throws KeeperException
*/
@VisibleForTesting
void openDaughterRegion(final Server server, final Region daughter)
throws IOException, KeeperException {
HRegionInfo hri = daughter.getRegionInfo();
LoggingProgressable reporter = server == null ? null
: new LoggingProgressable(hri, server.getConfiguration().getLong(
"hbase.regionserver.split.daughter.open.log.interval", 10000));
((HRegion)daughter).openHRegion(reporter);
}
static class LoggingProgressable implements CancelableProgressable {
private final HRegionInfo hri;
private long lastLog = -1;
private final long interval;
LoggingProgressable(final HRegionInfo hri, final long interval) {
this.hri = hri;
this.interval = interval;
}
@Override
public boolean progress() {
long now = EnvironmentEdgeManager.currentTime();
if (now - lastLog > this.interval) {
LOG.info("Opening " + this.hri.getRegionNameAsString());
this.lastLog = now;
}
return true;
}
}
/**
* Creates reference files for top and bottom half of the
* @param hstoreFilesToSplit map of store files to create half file references for.
* @return the number of reference files that were created.
* @throws IOException
*/
private Pair<Integer, Integer> splitStoreFiles(
final Map<byte[], List<StoreFile>> hstoreFilesToSplit)
throws IOException {
if (hstoreFilesToSplit == null) {
// Could be null because close didn't succeed -- for now consider it fatal
throw new IOException("Close returned empty list of StoreFiles");
}
// The following code sets up a thread pool executor with as many slots as
// there's files to split. It then fires up everything, waits for
// completion and finally checks for any exception
int nbFiles = hstoreFilesToSplit.size();
if (nbFiles == 0) {
// no file needs to be splitted.
return new Pair<Integer, Integer>(0,0);
}
LOG.info("Preparing to split " + nbFiles + " storefiles for region " + this.parent);
ThreadFactoryBuilder builder = new ThreadFactoryBuilder();
builder.setNameFormat("StoreFileSplitter-%1$d");
ThreadFactory factory = builder.build();
ThreadPoolExecutor threadPool =
(ThreadPoolExecutor) Executors.newFixedThreadPool(nbFiles, factory);
List<Future<Pair<Path,Path>>> futures = new ArrayList<Future<Pair<Path,Path>>> (nbFiles);
// Split each store file.
for (Map.Entry<byte[], List<StoreFile>> entry: hstoreFilesToSplit.entrySet()) {
for (StoreFile sf: entry.getValue()) {
StoreFileSplitter sfs = new StoreFileSplitter(entry.getKey(), sf);
futures.add(threadPool.submit(sfs));
}
}
// Shutdown the pool
threadPool.shutdown();
// Wait for all the tasks to finish
try {
boolean stillRunning = !threadPool.awaitTermination(
this.fileSplitTimeout, TimeUnit.MILLISECONDS);
if (stillRunning) {
threadPool.shutdownNow();
// wait for the thread to shutdown completely.
while (!threadPool.isTerminated()) {
Thread.sleep(50);
}
throw new IOException("Took too long to split the" +
" files and create the references, aborting split");
}
} catch (InterruptedException e) {
throw (InterruptedIOException)new InterruptedIOException().initCause(e);
}
int created_a = 0;
int created_b = 0;
// Look for any exception
for (Future<Pair<Path, Path>> future : futures) {
try {
Pair<Path, Path> p = future.get();
created_a += p.getFirst() != null ? 1 : 0;
created_b += p.getSecond() != null ? 1 : 0;
} catch (InterruptedException e) {
throw (InterruptedIOException) new InterruptedIOException().initCause(e);
} catch (ExecutionException e) {
throw new IOException(e);
}
}
if (LOG.isDebugEnabled()) {
LOG.debug("Split storefiles for region " + this.parent + " Daugther A: " + created_a
+ " storefiles, Daugther B: " + created_b + " storefiles.");
}
return new Pair<Integer, Integer>(created_a, created_b);
}
private Pair<Path, Path> splitStoreFile(final byte[] family, final StoreFile sf)
throws IOException {
HRegionFileSystem fs = this.parent.getRegionFileSystem();
String familyName = Bytes.toString(family);
Path path_a =
fs.splitStoreFile(this.hri_a, familyName, sf, this.splitrow, false,
this.parent.getSplitPolicy());
Path path_b =
fs.splitStoreFile(this.hri_b, familyName, sf, this.splitrow, true,
this.parent.getSplitPolicy());
return new Pair<Path,Path>(path_a, path_b);
}
/**
* Utility class used to do the file splitting / reference writing
* in parallel instead of sequentially.
*/
private class StoreFileSplitter implements Callable<Pair<Path,Path>> {
private final byte[] family;
private final StoreFile sf;
/**
* Constructor that takes what it needs to split
* @param family Family that contains the store file
* @param sf which file
*/
public StoreFileSplitter(final byte[] family, final StoreFile sf) {
this.sf = sf;
this.family = family;
}
public Pair<Path,Path> call() throws IOException {
return splitStoreFile(family, sf);
}
}
@Override
public boolean rollback(final Server server, final RegionServerServices services)
throws IOException {
this.server = server;
this.rsServices = services;
// Coprocessor callback
if (this.parent.getCoprocessorHost() != null) {
this.parent.getCoprocessorHost().preRollBackSplit();
}
boolean result = true;
ListIterator<JournalEntry> iterator =
this.journal.listIterator(this.journal.size());
// Iterate in reverse.
while (iterator.hasPrevious()) {
JournalEntry je = iterator.previous();
transition(je.getPhase(), true);
switch (je.getPhase()) {
case SET_SPLITTING:
if (services != null
&& !services.reportRegionStateTransition(TransitionCode.SPLIT_REVERTED,
parent.getRegionInfo(), hri_a, hri_b)) {
return false;
}
break;
case CREATE_SPLIT_DIR:
this.parent.writestate.writesEnabled = true;
this.parent.getRegionFileSystem().cleanupSplitsDir();
break;
case CLOSED_PARENT_REGION:
try {
// So, this returns a seqid but if we just closed and then reopened, we
// should be ok. On close, we flushed using sequenceid obtained from
// hosting regionserver so no need to propagate the sequenceid returned
// out of initialize below up into regionserver as we normally do.
// TODO: Verify.
this.parent.initialize();
} catch (IOException e) {
LOG.error("Failed rollbacking CLOSED_PARENT_REGION of region " +
parent.getRegionInfo().getRegionNameAsString(), e);
throw new RuntimeException(e);
}
break;
case STARTED_REGION_A_CREATION:
this.parent.getRegionFileSystem().cleanupDaughterRegion(this.hri_a);
break;
case STARTED_REGION_B_CREATION:
this.parent.getRegionFileSystem().cleanupDaughterRegion(this.hri_b);
break;
case OFFLINED_PARENT:
if (services != null) services.addToOnlineRegions(this.parent);
break;
case PONR:
// We got to the point-of-no-return so we need to just abort. Return
// immediately. Do not clean up created daughter regions. They need
// to be in place so we don't delete the parent region mistakenly.
// See HBASE-3872.
return false;
// Informational only cases
case STARTED:
case PREPARED:
case BEFORE_PRE_SPLIT_HOOK:
case AFTER_PRE_SPLIT_HOOK:
case BEFORE_POST_SPLIT_HOOK:
case AFTER_POST_SPLIT_HOOK:
case OPENED_REGION_A:
case OPENED_REGION_B:
case COMPLETED:
break;
default:
throw new RuntimeException("Unhandled journal entry: " + je);
}
}
// Coprocessor callback
if (this.parent.getCoprocessorHost() != null) {
this.parent.getCoprocessorHost().postRollBackSplit();
}
return result;
}
/* package */ HRegionInfo getFirstDaughter() {
return hri_a;
}
/* package */ HRegionInfo getSecondDaughter() {
return hri_b;
}
@Override
public List<JournalEntry> getJournal() {
return journal;
}
@Override
public SplitTransaction registerTransactionListener(TransactionListener listener) {
listeners.add(listener);
return this;
}
@Override
public Server getServer() {
return server;
}
@Override
public RegionServerServices getRegionServerServices() {
return rsServices;
}
}

7
hbase-server/src/test/java/org/apache/hadoop/hbase/coprocessor/TestCoprocessorInterface.java
View File

@ -59,6 +59,7 @@ import org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost;
import org.apache.hadoop.hbase.regionserver.RegionScanner;
import org.apache.hadoop.hbase.regionserver.ScanType;
import org.apache.hadoop.hbase.regionserver.SplitTransaction;
import org.apache.hadoop.hbase.regionserver.SplitTransactionFactory;
import org.apache.hadoop.hbase.regionserver.Store;
import org.apache.hadoop.hbase.regionserver.StoreFile;
import org.apache.hadoop.hbase.testclassification.CoprocessorTests;
@ -500,7 +501,8 @@ public class TestCoprocessorInterface {
private Region [] split(final Region r, final byte [] splitRow) throws IOException {
Region[] regions = new Region[2];
SplitTransaction st = new SplitTransaction(r, splitRow);
SplitTransaction st = new SplitTransactionFactory(TEST_UTIL.getConfiguration())
.create(r, splitRow);
int i = 0;
if (!st.prepare()) {
@ -509,8 +511,7 @@ public class TestCoprocessorInterface {
}
try {
Server mockServer = Mockito.mock(Server.class);
when(mockServer.getConfiguration()).thenReturn(
TEST_UTIL.getConfiguration());
when(mockServer.getConfiguration()).thenReturn(TEST_UTIL.getConfiguration());
PairOfSameType<Region> daughters = st.execute(mockServer, null);
for (Region each_daughter: daughters) {
regions[i] = each_daughter;

8
hbase-server/src/test/java/org/apache/hadoop/hbase/coprocessor/TestRegionServerObserver.java
View File

@ -40,7 +40,8 @@ import org.apache.hadoop.hbase.client.Mutation;
import org.apache.hadoop.hbase.regionserver.HRegion;
import org.apache.hadoop.hbase.regionserver.HRegionServer;
import org.apache.hadoop.hbase.regionserver.Region;
import org.apache.hadoop.hbase.regionserver.RegionMergeTransaction;
import org.apache.hadoop.hbase.regionserver.RegionMergeTransactionFactory;
import org.apache.hadoop.hbase.regionserver.RegionMergeTransactionImpl;
import org.apache.hadoop.hbase.regionserver.RegionServerCoprocessorHost;
import org.apache.hadoop.hbase.testclassification.CoprocessorTests;
import org.apache.hadoop.hbase.testclassification.MediumTests;
@ -110,7 +111,7 @@ public class TestRegionServerObserver {
}
public static class CPRegionServerObserver extends BaseRegionServerObserver {
private RegionMergeTransaction rmt = null;
private RegionMergeTransactionImpl rmt = null;
private HRegion mergedRegion = null;
private boolean preMergeCalled;
@ -143,7 +144,8 @@ public class TestRegionServerObserver {
HRegionServer rs = (HRegionServer) environment.getRegionServerServices();
List<Region> onlineRegions =
rs.getOnlineRegions(TableName.valueOf("testRegionServerObserver_2"));
rmt = new RegionMergeTransaction(onlineRegions.get(0), onlineRegions.get(1), true);
rmt = (RegionMergeTransactionImpl) new RegionMergeTransactionFactory(rs.getConfiguration())
.create(onlineRegions.get(0), onlineRegions.get(1), true);
if (!rmt.prepare(rs)) {
LOG.error("Prepare for the region merge of table "
+ onlineRegions.get(0).getTableDesc().getNameAsString()

2
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestEndToEndSplitTransaction.java
View File

@ -106,7 +106,7 @@ public class TestEndToEndSplitTransaction {
byte[] regionName = conn.getRegionLocator(tableName).getRegionLocation(splitRow)
.getRegionInfo().getRegionName();
Region region = server.getRegion(regionName);
SplitTransaction split = new SplitTransaction(region, splitRow);
SplitTransactionImpl split = new SplitTransactionImpl((HRegion) region, splitRow);
split.prepare();
// 1. phase I

2
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestHRegion.java
View File

@ -2490,7 +2490,7 @@ public class TestHRegion {
*/
HRegion[] splitRegion(final HRegion parent, final byte[] midkey) throws IOException {
PairOfSameType<Region> result = null;
SplitTransaction st = new SplitTransaction(parent, midkey);
SplitTransactionImpl st = new SplitTransactionImpl(parent, midkey);
// If prepare does not return true, for some reason -- logged inside in
// the prepare call -- we are not ready to split just now. Just return.
if (!st.prepare()) {

44
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestRegionMergeTransaction.java
View File

@ -60,7 +60,7 @@ import org.mockito.Mockito;
import com.google.common.collect.ImmutableList;
/**
* Test the {@link RegionMergeTransaction} class against two HRegions (as
* Test the {@link RegionMergeTransactionImpl} class against two HRegions (as
* opposed to running cluster).
*/
@Category({RegionServerTests.class, SmallTests.class})
@ -120,10 +120,10 @@ public class TestRegionMergeTransaction {
prepareOnGoodRegions();
}
private RegionMergeTransaction prepareOnGoodRegions() throws IOException {
RegionMergeTransaction mt = new RegionMergeTransaction(region_a, region_b,
private RegionMergeTransactionImpl prepareOnGoodRegions() throws IOException {
RegionMergeTransactionImpl mt = new RegionMergeTransactionImpl(region_a, region_b,
false);
RegionMergeTransaction spyMT = Mockito.spy(mt);
RegionMergeTransactionImpl spyMT = Mockito.spy(mt);
doReturn(false).when(spyMT).hasMergeQualifierInMeta(null,
region_a.getRegionInfo().getRegionName());
doReturn(false).when(spyMT).hasMergeQualifierInMeta(null,
@ -137,7 +137,7 @@ public class TestRegionMergeTransaction {
*/
@Test
public void testPrepareWithSameRegion() throws IOException {
RegionMergeTransaction mt = new RegionMergeTransaction(this.region_a,
RegionMergeTransactionImpl mt = new RegionMergeTransactionImpl(this.region_a,
this.region_a, true);
assertFalse("should not merge the same region even if it is forcible ",
mt.prepare(null));
@ -148,7 +148,7 @@ public class TestRegionMergeTransaction {
*/
@Test
public void testPrepareWithRegionsNotAdjacent() throws IOException {
RegionMergeTransaction mt = new RegionMergeTransaction(this.region_a,
RegionMergeTransactionImpl mt = new RegionMergeTransactionImpl(this.region_a,
this.region_c, false);
assertFalse("should not merge two regions if they are adjacent except it is forcible",
mt.prepare(null));
@ -160,9 +160,9 @@ public class TestRegionMergeTransaction {
@Test
public void testPrepareWithRegionsNotAdjacentUnderCompulsory()
throws IOException {
RegionMergeTransaction mt = new RegionMergeTransaction(region_a, region_c,
RegionMergeTransactionImpl mt = new RegionMergeTransactionImpl(region_a, region_c,
true);
RegionMergeTransaction spyMT = Mockito.spy(mt);
RegionMergeTransactionImpl spyMT = Mockito.spy(mt);
doReturn(false).when(spyMT).hasMergeQualifierInMeta(null,
region_a.getRegionInfo().getRegionName());
doReturn(false).when(spyMT).hasMergeQualifierInMeta(null,
@ -181,7 +181,7 @@ public class TestRegionMergeTransaction {
when(storeMock.getFamily()).thenReturn(new HColumnDescriptor("cf"));
when(storeMock.close()).thenReturn(ImmutableList.<StoreFile>of());
this.region_a.stores.put(Bytes.toBytes(""), storeMock);
RegionMergeTransaction mt = new RegionMergeTransaction(this.region_a,
RegionMergeTransactionImpl mt = new RegionMergeTransactionImpl(this.region_a,
this.region_b, false);
assertFalse(
"a region should not be mergeable if it has instances of store file references",
@ -191,7 +191,7 @@ public class TestRegionMergeTransaction {
@Test
public void testPrepareWithClosedRegion() throws IOException {
this.region_a.close();
RegionMergeTransaction mt = new RegionMergeTransaction(this.region_a,
RegionMergeTransactionImpl mt = new RegionMergeTransactionImpl(this.region_a,
this.region_b, false);
assertFalse(mt.prepare(null));
}
@ -202,9 +202,9 @@ public class TestRegionMergeTransaction {
*/
@Test
public void testPrepareWithRegionsWithMergeReference() throws IOException {
RegionMergeTransaction mt = new RegionMergeTransaction(region_a, region_b,
RegionMergeTransactionImpl mt = new RegionMergeTransactionImpl(region_a, region_b,
false);
RegionMergeTransaction spyMT = Mockito.spy(mt);
RegionMergeTransactionImpl spyMT = Mockito.spy(mt);
doReturn(true).when(spyMT).hasMergeQualifierInMeta(null,
region_a.getRegionInfo().getRegionName());
doReturn(true).when(spyMT).hasMergeQualifierInMeta(null,
@ -221,14 +221,14 @@ public class TestRegionMergeTransaction {
assertEquals(rowCountOfRegionB, countRows(this.region_b));
// Start transaction.
RegionMergeTransaction mt = prepareOnGoodRegions();
RegionMergeTransactionImpl mt = prepareOnGoodRegions();
// Run the execute. Look at what it returns.
TEST_UTIL.getConfiguration().setInt(HConstants.REGIONSERVER_PORT, 0);
CoordinatedStateManager cp = CoordinatedStateManagerFactory.getCoordinatedStateManager(
TEST_UTIL.getConfiguration());
Server mockServer = new HRegionServer(TEST_UTIL.getConfiguration(), cp);
HRegion mergedRegion = mt.execute(mockServer, null);
HRegion mergedRegion = (HRegion)mt.execute(mockServer, null);
// Do some assertions about execution.
assertTrue(this.fs.exists(mt.getMergesDir()));
// Assert region_a and region_b is closed.
@ -265,7 +265,7 @@ public class TestRegionMergeTransaction {
assertEquals(rowCountOfRegionB, countRows(this.region_b));
// Start transaction.
RegionMergeTransaction mt = prepareOnGoodRegions();
RegionMergeTransactionImpl mt = prepareOnGoodRegions();
when(mt.createMergedRegionFromMerges(region_a, region_b,
mt.getMergedRegionInfo())).thenThrow(
@ -301,7 +301,7 @@ public class TestRegionMergeTransaction {
// Now retry the merge but do not throw an exception this time.
assertTrue(mt.prepare(null));
HRegion mergedRegion = mt.execute(mockServer, null);
HRegion mergedRegion = (HRegion)mt.execute(mockServer, null);
// Count rows. daughters are already open
// Count rows. merged region are already open
try {
@ -325,7 +325,7 @@ public class TestRegionMergeTransaction {
assertEquals(rowCountOfRegionB, countRows(this.region_b));
// Start transaction.
RegionMergeTransaction mt = prepareOnGoodRegions();
RegionMergeTransactionImpl mt = prepareOnGoodRegions();
Mockito.doThrow(new MockedFailedMergedRegionOpen())
.when(mt)
.openMergedRegion((Server) Mockito.anyObject(),
@ -365,31 +365,31 @@ public class TestRegionMergeTransaction {
byte[] z = Bytes.toBytes("z");
HRegionInfo r1 = new HRegionInfo(tableName);
HRegionInfo r2 = new HRegionInfo(tableName, a, z);
HRegionInfo m = RegionMergeTransaction.getMergedRegionInfo(r1, r2);
HRegionInfo m = RegionMergeTransactionImpl.getMergedRegionInfo(r1, r2);
assertTrue(Bytes.equals(m.getStartKey(), r1.getStartKey())
&& Bytes.equals(m.getEndKey(), r1.getEndKey()));
r1 = new HRegionInfo(tableName, null, a);
r2 = new HRegionInfo(tableName, a, z);
m = RegionMergeTransaction.getMergedRegionInfo(r1, r2);
m = RegionMergeTransactionImpl.getMergedRegionInfo(r1, r2);
assertTrue(Bytes.equals(m.getStartKey(), r1.getStartKey())
&& Bytes.equals(m.getEndKey(), r2.getEndKey()));
r1 = new HRegionInfo(tableName, null, a);
r2 = new HRegionInfo(tableName, z, null);
m = RegionMergeTransaction.getMergedRegionInfo(r1, r2);
m = RegionMergeTransactionImpl.getMergedRegionInfo(r1, r2);
assertTrue(Bytes.equals(m.getStartKey(), r1.getStartKey())
&& Bytes.equals(m.getEndKey(), r2.getEndKey()));
r1 = new HRegionInfo(tableName, a, z);
r2 = new HRegionInfo(tableName, z, null);
m = RegionMergeTransaction.getMergedRegionInfo(r1, r2);
m = RegionMergeTransactionImpl.getMergedRegionInfo(r1, r2);
assertTrue(Bytes.equals(m.getStartKey(), r1.getStartKey())
&& Bytes.equals(m.getEndKey(), r2.getEndKey()));
r1 = new HRegionInfo(tableName, a, b);
r2 = new HRegionInfo(tableName, b, z);
m = RegionMergeTransaction.getMergedRegionInfo(r1, r2);
m = RegionMergeTransactionImpl.getMergedRegionInfo(r1, r2);
assertTrue(Bytes.equals(m.getStartKey(), r1.getStartKey())
&& Bytes.equals(m.getEndKey(), r2.getEndKey()));
}

2
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestRegionMergeTransactionOnCluster.java
View File

@ -81,7 +81,7 @@ import com.google.protobuf.ServiceException;
/**
* Like {@link TestRegionMergeTransaction} in that we're testing
* {@link RegionMergeTransaction} only the below tests are against a running
* {@link RegionMergeTransactionImpl} only the below tests are against a running
* cluster where {@link TestRegionMergeTransaction} is tests against bare
* {@link HRegion}.
*/

35
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestSplitTransaction.java
View File

@ -67,7 +67,7 @@ import org.mockito.Mockito;
import com.google.common.collect.ImmutableList;
/**
* Test the {@link SplitTransaction} class against an HRegion (as opposed to
* Test the {@link SplitTransactionImpl} class against an HRegion (as opposed to
* running cluster).
*/
@Category({RegionServerTests.class, SmallTests.class})
@ -120,8 +120,8 @@ public class TestSplitTransaction {
assertEquals(rowcount, parentRowCount);
// Start transaction.
SplitTransaction st = prepareGOOD_SPLIT_ROW();
SplitTransaction spiedUponSt = spy(st);
SplitTransactionImpl st = prepareGOOD_SPLIT_ROW();
SplitTransactionImpl spiedUponSt = spy(st);
Mockito
.doThrow(new MockedFailedDaughterOpen())
.when(spiedUponSt)
@ -161,12 +161,13 @@ public class TestSplitTransaction {
prepareGOOD_SPLIT_ROW();
}
private SplitTransaction prepareGOOD_SPLIT_ROW() {
private SplitTransactionImpl prepareGOOD_SPLIT_ROW() throws IOException {
return prepareGOOD_SPLIT_ROW(this.parent);
}
private SplitTransaction prepareGOOD_SPLIT_ROW(final HRegion parentRegion) {
SplitTransaction st = new SplitTransaction(parentRegion, GOOD_SPLIT_ROW);
private SplitTransactionImpl prepareGOOD_SPLIT_ROW(final HRegion parentRegion)
throws IOException {
SplitTransactionImpl st = new SplitTransactionImpl(parentRegion, GOOD_SPLIT_ROW);
assertTrue(st.prepare());
return st;
}
@ -181,7 +182,7 @@ public class TestSplitTransaction {
when(storeMock.close()).thenReturn(ImmutableList.<StoreFile>of());
this.parent.stores.put(Bytes.toBytes(""), storeMock);
SplitTransaction st = new SplitTransaction(this.parent, GOOD_SPLIT_ROW);
SplitTransactionImpl st = new SplitTransactionImpl(this.parent, GOOD_SPLIT_ROW);
assertFalse("a region should not be splittable if it has instances of store file references",
st.prepare());
@ -192,19 +193,19 @@ public class TestSplitTransaction {
*/
@Test public void testPrepareWithBadSplitRow() throws IOException {
// Pass start row as split key.
SplitTransaction st = new SplitTransaction(this.parent, STARTROW);
SplitTransactionImpl st = new SplitTransactionImpl(this.parent, STARTROW);
assertFalse(st.prepare());
st = new SplitTransaction(this.parent, HConstants.EMPTY_BYTE_ARRAY);
st = new SplitTransactionImpl(this.parent, HConstants.EMPTY_BYTE_ARRAY);
assertFalse(st.prepare());
st = new SplitTransaction(this.parent, new byte [] {'A', 'A', 'A'});
st = new SplitTransactionImpl(this.parent, new byte [] {'A', 'A', 'A'});
assertFalse(st.prepare());
st = new SplitTransaction(this.parent, ENDROW);
st = new SplitTransactionImpl(this.parent, ENDROW);
assertFalse(st.prepare());
}
@Test public void testPrepareWithClosedRegion() throws IOException {
this.parent.close();
SplitTransaction st = new SplitTransaction(this.parent, GOOD_SPLIT_ROW);
SplitTransactionImpl st = new SplitTransactionImpl(this.parent, GOOD_SPLIT_ROW);
assertFalse(st.prepare());
}
@ -220,7 +221,7 @@ public class TestSplitTransaction {
((LruBlockCache) cacheConf.getBlockCache()).clearCache();
// Start transaction.
SplitTransaction st = prepareGOOD_SPLIT_ROW();
SplitTransactionImpl st = prepareGOOD_SPLIT_ROW();
// Run the execute. Look at what it returns.
Server mockServer = Mockito.mock(Server.class);
@ -266,8 +267,8 @@ public class TestSplitTransaction {
// Start transaction.
HRegion spiedRegion = spy(this.parent);
SplitTransaction st = prepareGOOD_SPLIT_ROW(spiedRegion);
SplitTransaction spiedUponSt = spy(st);
SplitTransactionImpl st = prepareGOOD_SPLIT_ROW(spiedRegion);
SplitTransactionImpl spiedUponSt = spy(st);
doThrow(new IOException("Failing split. Expected reference file count isn't equal."))
.when(spiedUponSt).assertReferenceFileCount(anyInt(),
eq(new Path(this.parent.getRegionFileSystem().getTableDir(),
@ -294,8 +295,8 @@ public class TestSplitTransaction {
// Start transaction.
HRegion spiedRegion = spy(this.parent);
SplitTransaction st = prepareGOOD_SPLIT_ROW(spiedRegion);
SplitTransaction spiedUponSt = spy(st);
SplitTransactionImpl st = prepareGOOD_SPLIT_ROW(spiedRegion);
SplitTransactionImpl spiedUponSt = spy(st);
doNothing().when(spiedUponSt).assertReferenceFileCount(anyInt(),
eq(parent.getRegionFileSystem().getSplitsDir(st.getFirstDaughter())));
when(spiedRegion.createDaughterRegionFromSplits(spiedUponSt.getSecondDaughter())).

23
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestSplitTransactionOnCluster.java
View File

@ -111,7 +111,7 @@ import com.google.protobuf.RpcController;
import com.google.protobuf.ServiceException;
/**
* Like TestSplitTransaction in that we're testing {@link SplitTransaction}
* Like TestSplitTransaction in that we're testing {@link SplitTransactionImpl}
* only the below tests are against a running cluster where TestSplitTransaction
* is tests against a bare {@link HRegion}.
*/
@ -264,7 +264,7 @@ public class TestSplitTransactionOnCluster {
assertTrue(fileNum > store.getStorefiles().size());
// 3, Split
SplitTransaction st = new SplitTransaction(region, Bytes.toBytes("row3"));
SplitTransactionImpl st = new SplitTransactionImpl(region, Bytes.toBytes("row3"));
assertTrue(st.prepare());
st.execute(regionServer, regionServer);
assertEquals(2, cluster.getRegions(tableName).size());
@ -474,7 +474,6 @@ public class TestSplitTransactionOnCluster {
@Test(timeout = 180000)
public void testSplitShouldNotThrowNPEEvenARegionHasEmptySplitFiles() throws Exception {
Configuration conf = TESTING_UTIL.getConfiguration();
TableName userTableName =
TableName.valueOf("testSplitShouldNotThrowNPEEvenARegionHasEmptySplitFiles");
HTableDescriptor htd = new HTableDescriptor(userTableName);
@ -649,7 +648,7 @@ public class TestSplitTransactionOnCluster {
assertEquals("The specified table should present.", true, tableExists);
final HRegion region = findSplittableRegion(regions);
assertTrue("not able to find a splittable region", region != null);
SplitTransaction st = new SplitTransaction(region, Bytes.toBytes("row2"));
SplitTransactionImpl st = new SplitTransactionImpl(region, Bytes.toBytes("row2"));
try {
st.prepare();
st.createDaughters(regionServer, regionServer);
@ -707,7 +706,7 @@ public class TestSplitTransactionOnCluster {
regionServerIndex = cluster.getServerWith(region.getRegionInfo().getRegionName());
regionServer = cluster.getRegionServer(regionServerIndex);
assertTrue("not able to find a splittable region", region != null);
SplitTransaction st = new SplitTransaction(region, Bytes.toBytes("row2"));
SplitTransactionImpl st = new SplitTransactionImpl(region, Bytes.toBytes("row2"));
try {
st.prepare();
st.execute(regionServer, regionServer);
@ -807,7 +806,7 @@ public class TestSplitTransactionOnCluster {
assertTrue("not able to find a splittable region", region != null);
// Now split.
SplitTransaction st = new MockedSplitTransaction(region, Bytes.toBytes("row2"));
SplitTransactionImpl st = new MockedSplitTransaction(region, Bytes.toBytes("row2"));
try {
st.prepare();
st.execute(regionServer, regionServer);
@ -882,7 +881,7 @@ public class TestSplitTransactionOnCluster {
assertTrue("not able to find a splittable region", region != null);
// Now split.
SplitTransaction st = new SplitTransaction(region, Bytes.toBytes("row2"));
SplitTransactionImpl st = new SplitTransactionImpl(region, Bytes.toBytes("row2"));
try {
st.prepare();
st.execute(regionServer, regionServer);
@ -976,7 +975,7 @@ public class TestSplitTransactionOnCluster {
int serverWith = cluster.getServerWith(regions.get(0).getRegionInfo().getRegionName());
HRegionServer regionServer = cluster.getRegionServer(serverWith);
cluster.getServerWith(regions.get(0).getRegionInfo().getRegionName());
SplitTransaction st = new SplitTransaction(regions.get(0), Bytes.toBytes("r3"));
SplitTransactionImpl st = new SplitTransactionImpl(regions.get(0), Bytes.toBytes("r3"));
st.prepare();
st.stepsBeforePONR(regionServer, regionServer, false);
Path tableDir =
@ -1019,7 +1018,7 @@ public class TestSplitTransactionOnCluster {
HRegionServer regionServer = cluster.getRegionServer(regionServerIndex);
final HRegion region = findSplittableRegion(regions);
assertTrue("not able to find a splittable region", region != null);
SplitTransaction st = new MockedSplitTransaction(region, Bytes.toBytes("row2")) {
SplitTransactionImpl st = new MockedSplitTransaction(region, Bytes.toBytes("row2")) {
@Override
public PairOfSameType<Region> stepsBeforePONR(final Server server,
final RegionServerServices services, boolean testing) throws IOException {
@ -1080,7 +1079,7 @@ public class TestSplitTransactionOnCluster {
}
}
public static class MockedSplitTransaction extends SplitTransaction {
public static class MockedSplitTransaction extends SplitTransactionImpl {
private HRegion currentRegion;
public MockedSplitTransaction(HRegion region, byte[] splitrow) {
@ -1318,7 +1317,7 @@ public class TestSplitTransactionOnCluster {
}
public static class MockedRegionObserver extends BaseRegionObserver {
private SplitTransaction st = null;
private SplitTransactionImpl st = null;
private PairOfSameType<Region> daughterRegions = null;
@Override
@ -1335,7 +1334,7 @@ public class TestSplitTransactionOnCluster {
break;
}
}
st = new SplitTransaction(region, splitKey);
st = new SplitTransactionImpl((HRegion) region, splitKey);
if (!st.prepare()) {
LOG.error("Prepare for the table " + region.getTableDesc().getNameAsString()
+ " failed. So returning null. ");

7
hbase-server/src/test/java/org/apache/hadoop/hbase/util/TestHBaseFsck.java
View File

@ -100,7 +100,8 @@ import org.apache.hadoop.hbase.protobuf.generated.AdminProtos;
import org.apache.hadoop.hbase.regionserver.HRegion;
import org.apache.hadoop.hbase.regionserver.HRegionFileSystem;
import org.apache.hadoop.hbase.regionserver.HRegionServer;
import org.apache.hadoop.hbase.regionserver.SplitTransaction;
import org.apache.hadoop.hbase.regionserver.SplitTransactionFactory;
import org.apache.hadoop.hbase.regionserver.SplitTransactionImpl;
import org.apache.hadoop.hbase.regionserver.TestEndToEndSplitTransaction;
import org.apache.hadoop.hbase.security.access.AccessControlClient;
import org.apache.hadoop.hbase.testclassification.LargeTests;
@ -1251,7 +1252,9 @@ public class TestHBaseFsck {
int serverWith = cluster.getServerWith(regions.get(0).getRegionInfo().getRegionName());
HRegionServer regionServer = cluster.getRegionServer(serverWith);
cluster.getServerWith(regions.get(0).getRegionInfo().getRegionName());
SplitTransaction st = new SplitTransaction(regions.get(0), Bytes.toBytes("r3"));
SplitTransactionImpl st = (SplitTransactionImpl)
new SplitTransactionFactory(TEST_UTIL.getConfiguration())
.create(regions.get(0), Bytes.toBytes("r3"));
st.prepare();
st.stepsBeforePONR(regionServer, regionServer, false);
AssignmentManager am = cluster.getMaster().getAssignmentManager();