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HBASE-524 Problems with getFull 

-Added new test case to exercise the problems
-Fixed getFull implementation in HStore and Memcache

git-svn-id: https://svn.apache.org/repos/asf/hadoop/hbase/trunk@638525 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Bryan Duxbury 2008-03-18 19:34:33 +00:00
parent 0b65a3cc46
commit ea1ac1f75c
5 changed files with 184 additions and 40 deletions
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1
CHANGES.txt
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@ -45,6 +45,7 @@ Hbase Change Log
HBASE-516 HStoreFile.finalKey does not update the final key if it is not
the top region of a split region
HBASE-525 HTable.getRow(Text) does not work (Clint Morgan via Bryan Duxbury)
HBASE-524 Problems with getFull
IMPROVEMENTS
HBASE-415 Rewrite leases to use DelayedBlockingQueue instead of polling

87
src/java/org/apache/hadoop/hbase/regionserver/HStore.java
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@ -1057,7 +1057,7 @@ public class HStore implements HConstants {
*/
void getFull(HStoreKey key, final Set<Text> columns, TreeMap<Text, Cell> results)
throws IOException {
Map<Text, List<Long>> deletes = new HashMap<Text, List<Long>>();
Map<Text, Long> deletes = new HashMap<Text, Long>();
// if the key is null, we're not even looking for anything. return.
if (key == null) {
@ -1067,7 +1067,7 @@ public class HStore implements HConstants {
this.lock.readLock().lock();
// get from the memcache first.
memcache.getFull(key, columns, results);
memcache.getFull(key, columns, deletes, results);
try {
MapFile.Reader[] maparray = getReaders();
@ -1078,33 +1078,7 @@ public class HStore implements HConstants {
// synchronize on the map so that no one else iterates it at the same
// time
synchronized(map) {
// seek back to the beginning
map.reset();
// seek to the closest key that should match the row we're looking for
ImmutableBytesWritable readval = new ImmutableBytesWritable();
HStoreKey readkey = (HStoreKey)map.getClosest(key, readval);
if (readkey == null) {
continue;
}
do {
Text readcol = readkey.getColumn();
if (results.get(readcol) == null
&& key.matchesWithoutColumn(readkey)) {
if(isDeleted(readkey, readval.get(), true, deletes)) {
break;
}
if (columns == null || columns.contains(readkey.getColumn())) {
results.put(new Text(readcol), new Cell(readval.get(), readkey.getTimestamp()));
}
readval = new ImmutableBytesWritable();
} else if(key.getRow().compareTo(readkey.getRow()) < 0) {
break;
}
} while(map.next(readkey, readval));
}
getFullFromMapFile(map, key, columns, deletes, results);
}
} finally {
@ -1112,6 +1086,61 @@ public class HStore implements HConstants {
}
}
private void getFullFromMapFile(MapFile.Reader map, HStoreKey key,
Set<Text> columns, Map<Text, Long> deletes, TreeMap<Text, Cell> results)
throws IOException {
synchronized(map) {
// seek back to the beginning
map.reset();
// seek to the closest key that should match the row we're looking for
ImmutableBytesWritable readval = new ImmutableBytesWritable();
HStoreKey readkey = (HStoreKey)map.getClosest(key, readval);
if (readkey == null) {
return;
}
do {
Text readcol = readkey.getColumn();
// if we're looking for this column (or all of them), and there isn't
// already a value for this column in the results map, and the key we
// just read matches, then we'll consider it
if ((columns == null || columns.contains(readcol))
&& !results.containsKey(readcol)
&& key.matchesWithoutColumn(readkey)) {
// if the value of the cell we're looking at right now is a delete,
// we need to treat it differently
if(HLogEdit.isDeleted(readval.get())) {
// if it's not already recorded as a delete or recorded with a more
// recent delete timestamp, record it for later
if (!deletes.containsKey(readcol)
|| deletes.get(readcol).longValue() < readkey.getTimestamp()) {
deletes.put(new Text(readcol), readkey.getTimestamp());
}
} else if (!(deletes.containsKey(readcol)
&& deletes.get(readcol).longValue() >= readkey.getTimestamp()) ) {
// So the cell itself isn't a delete, but there may be a delete
// pending from earlier in our search. Only record this result if
// there aren't any pending deletes.
if (!(deletes.containsKey(readcol)
&& deletes.get(readcol).longValue() >= readkey.getTimestamp())) {
results.put(new Text(readcol),
new Cell(readval.get(), readkey.getTimestamp()));
// need to reinstantiate the readval so we can reuse it,
// otherwise next iteration will destroy our result
readval = new ImmutableBytesWritable();
}
}
} else if(key.getRow().compareTo(readkey.getRow()) < 0) {
// if we've crossed into the next row, then we can just stop
// iterating
break;
}
} while(map.next(readkey, readval));
}
}
MapFile.Reader [] getReaders() {
return this.readers.values().
toArray(new MapFile.Reader[this.readers.size()]);

23
src/java/org/apache/hadoop/hbase/regionserver/Memcache.java
View File

@ -145,14 +145,15 @@ class Memcache {
* @param key
* @param results
*/
void getFull(HStoreKey key, Set<Text> columns, SortedMap<Text, Cell> results) {
void getFull(HStoreKey key, Set<Text> columns, Map<Text, Long> deletes,
SortedMap<Text, Cell> results) {
this.lock.readLock().lock();
try {
synchronized (memcache) {
internalGetFull(memcache, key, columns, results);
internalGetFull(memcache, key, columns, deletes, results);
}
synchronized (snapshot) {
internalGetFull(snapshot, key, columns, results);
internalGetFull(snapshot, key, columns, deletes, results);
}
} finally {
@ -161,7 +162,8 @@ class Memcache {
}
private void internalGetFull(SortedMap<HStoreKey, byte[]> map, HStoreKey key,
Set<Text> columns, SortedMap<Text, Cell> results) {
Set<Text> columns, Map<Text, Long> deletes,
SortedMap<Text, Cell> results) {
if (map.isEmpty() || key == null) {
return;
@ -174,12 +176,17 @@ class Memcache {
if (results.get(itCol) == null && key.matchesWithoutColumn(itKey)) {
byte [] val = tailMap.get(itKey);
if (!HLogEdit.isDeleted(val)) {
if (columns == null || columns.contains(itKey.getColumn())) {
results.put(itCol, new Cell(val, itKey.getTimestamp()));
if (columns == null || columns.contains(itKey.getColumn())) {
if (HLogEdit.isDeleted(val)) {
if (!deletes.containsKey(itCol)
|| deletes.get(itCol).longValue() < itKey.getTimestamp()) {
deletes.put(new Text(itCol), itKey.getTimestamp());
}
} else if (!(deletes.containsKey(itCol)
&& deletes.get(itCol).longValue() >= itKey.getTimestamp())) {
results.put(new Text(itCol), new Cell(val, itKey.getTimestamp()));
}
}
} else if (key.getRow().compareTo(itKey.getRow()) < 0) {
break;
}

108
src/test/org/apache/hadoop/hbase/regionserver/TestGet2.java
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@ -23,6 +23,7 @@ import java.io.IOException;
import java.util.Map;
import java.util.HashSet;
import java.util.TreeMap;
import java.util.Set;
import org.apache.hadoop.dfs.MiniDFSCluster;
import org.apache.hadoop.hbase.filter.StopRowFilter;
@ -40,7 +41,7 @@ import org.apache.hadoop.hbase.io.BatchUpdate;
* {@link TestGet} is a medley of tests of get all done up as a single test.
* This class
*/
public class TestGet2 extends HBaseTestCase {
public class TestGet2 extends HBaseTestCase implements HConstants {
private MiniDFSCluster miniHdfs;
@Override
@ -301,6 +302,111 @@ public class TestGet2 extends HBaseTestCase {
assertNull(result.get(COLUMNS[2]));
}
public void testGetFullMultiMapfile() throws IOException {
HRegion region = null;
HRegionIncommon region_incommon = null;
BatchUpdate batchUpdate = null;
Map<Text, Cell> results = null;
try {
HTableDescriptor htd = createTableDescriptor(getName());
region = createNewHRegion(htd, null, null);
region_incommon = new HRegionIncommon(region);
//
// Test ordering issue
//
Text row = new Text("row1");
// write some data
batchUpdate = new BatchUpdate(row);
batchUpdate.put(COLUMNS[0], "olderValue".getBytes());
region.batchUpdate(batchUpdate);
// flush
region.flushcache();
// assert that getFull gives us the older value
results = region.getFull(row, (Set<Text>)null, LATEST_TIMESTAMP);
assertEquals("olderValue", new String(results.get(COLUMNS[0]).getValue()));
// write a new value for the cell
batchUpdate = new BatchUpdate(row);
batchUpdate.put(COLUMNS[0], "newerValue".getBytes());
region.batchUpdate(batchUpdate);
// flush
region.flushcache();
// assert that getFull gives us the later value
results = region.getFull(row, (Set<Text>)null, LATEST_TIMESTAMP);
assertEquals("newerValue", new String(results.get(COLUMNS[0]).getValue()));
//
// Test the delete masking issue
//
Text row2 = new Text("row2");
Text cell1 = new Text(COLUMNS[0].toString() + "a");
Text cell2 = new Text(COLUMNS[0].toString() + "b");
Text cell3 = new Text(COLUMNS[0].toString() + "c");
// write some data at two columns
batchUpdate = new BatchUpdate(row2);
batchUpdate.put(cell1, "column0 value".getBytes());
batchUpdate.put(cell2, "column1 value".getBytes());
region.batchUpdate(batchUpdate);
// flush
region.flushcache();
// assert i get both columns
results = region.getFull(row2, (Set<Text>)null, LATEST_TIMESTAMP);
assertEquals("Should have two columns in the results map", 2, results.size());
assertEquals("column0 value", new String(results.get(cell1).getValue()));
assertEquals("column1 value", new String(results.get(cell2).getValue()));
// write a delete for the first column
batchUpdate = new BatchUpdate(row2);
batchUpdate.delete(cell1);
batchUpdate.put(cell2, "column1 new value".getBytes());
region.batchUpdate(batchUpdate);
// flush
region.flushcache();
// assert i get the second column only
results = region.getFull(row2, (Set<Text>)null, LATEST_TIMESTAMP);
assertEquals("Should have one column in the results map", 1, results.size());
assertNull("column0 value", results.get(cell1));
assertEquals("column1 new value", new String(results.get(cell2).getValue()));
//
// Include a delete and value from the memcache in the mix
//
batchUpdate = new BatchUpdate(row2);
batchUpdate.delete(cell2);
batchUpdate.put(cell3, "column2 value!".getBytes());
region.batchUpdate(batchUpdate);
// assert i get the third column only
results = region.getFull(row2, (Set<Text>)null, LATEST_TIMESTAMP);
assertEquals("Should have one column in the results map", 1, results.size());
assertNull("column0 value", results.get(cell1));
assertNull("column1 value", results.get(cell2));
assertEquals("column2 value!", new String(results.get(cell3).getValue()));
} finally {
if (region != null) {
try {
region.close();
} catch (Exception e) {
e.printStackTrace();
}
region.getLog().closeAndDelete();
}
}
}
private void assertColumnsPresent(final HRegion r, final Text row)
throws IOException {
Map<Text, Cell> result = r.getFull(row, null, HConstants.LATEST_TIMESTAMP);

3
src/test/org/apache/hadoop/hbase/regionserver/TestHMemcache.java
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@ -136,7 +136,8 @@ public class TestHMemcache extends TestCase {
for (int i = 0; i < ROW_COUNT; i++) {
HStoreKey hsk = new HStoreKey(getRowName(i));
TreeMap<Text, Cell> all = new TreeMap<Text, Cell>();
this.hmemcache.getFull(hsk, null, all);
TreeMap<Text, Long> deletes = new TreeMap<Text, Long>();
this.hmemcache.getFull(hsk, null, deletes, all);
isExpectedRow(i, all);
}
}