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Revert "HBASE-18551 [AMv2] UnassignProcedure and crashed regionservers" 

This reverts commit 2dd75d10f8.
This commit is contained in:
Michael Stack 2017-08-10 14:59:52 -07:00
parent b65f119c78
commit e4ba404a5a
12 changed files with 60 additions and 95 deletions
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10
hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/ProcedureExecutor.java
View File

@ -315,7 +315,7 @@ public class ProcedureExecutor<TEnvironment> {
@Override
public void setMaxProcId(long maxProcId) {
assert lastProcId.get() < 0 : "expected only one call to setMaxProcId()";
LOG.debug("Load max pid=" + maxProcId);
LOG.debug("Load maxProcId=" + maxProcId);
lastProcId.set(maxProcId);
}
@ -727,7 +727,7 @@ public class ProcedureExecutor<TEnvironment> {
!(procedures.containsKey(oldProcId) || completed.containsKey(oldProcId)) &&
nonceKeysToProcIdsMap.containsKey(nonceKey)) {
if (traceEnabled) {
LOG.trace("Waiting for pid=" + oldProcId.longValue() + " to be submitted");
LOG.trace("Waiting for procId=" + oldProcId.longValue() + " to be submitted");
}
Threads.sleep(100);
}
@ -999,9 +999,9 @@ public class ProcedureExecutor<TEnvironment> {
public void removeResult(final long procId) {
CompletedProcedureRetainer retainer = completed.get(procId);
if (retainer == null) {
assert !procedures.containsKey(procId) : "pid=" + procId + " is still running";
assert !procedures.containsKey(procId) : "procId=" + procId + " is still running";
if (LOG.isDebugEnabled()) {
LOG.debug("pid=" + procId + " already removed by the cleaner.");
LOG.debug("procId=" + procId + " already removed by the cleaner.");
}
return;
}
@ -1349,7 +1349,7 @@ public class ProcedureExecutor<TEnvironment> {
return LockState.LOCK_YIELD_WAIT;
} catch (Throwable e) {
// Catch NullPointerExceptions or similar errors...
LOG.fatal("CODE-BUG: Uncaught runtime exception for " + proc, e);
LOG.fatal("CODE-BUG: Uncaught runtime exception fo " + proc, e);
}
// allows to kill the executor before something is stored to the wal.

2
hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterRpcServices.java
View File

@ -1007,7 +1007,7 @@ public class MasterRpcServices extends RSRpcServices
@Override
public GetProcedureResultResponse getProcedureResult(RpcController controller,
GetProcedureResultRequest request) throws ServiceException {
LOG.debug("Checking to see if procedure is done pid=" + request.getProcId());
LOG.debug("Checking to see if procedure is done procId=" + request.getProcId());
try {
master.checkInitialized();
GetProcedureResultResponse.Builder builder = GetProcedureResultResponse.newBuilder();

2
hbase-server/src/main/java/org/apache/hadoop/hbase/master/TableNamespaceManager.java
View File

@ -240,7 +240,7 @@ public class TableNamespaceManager {
// Sleep some
Threads.sleep(10);
}
throw new TimeoutIOException("Procedure pid=" + procId + " is still running");
throw new TimeoutIOException("Procedure " + procId + " is still running");
}
/**

1
hbase-server/src/main/java/org/apache/hadoop/hbase/master/TableStateManager.java
View File

@ -42,7 +42,6 @@ import org.apache.hadoop.hbase.client.TableState;
/**
* This is a helper class used to manage table states.
* States persisted in tableinfo and cached internally.
* TODO: Cache state. Cut down on meta looksups.
*/
@InterfaceAudience.Private
public class TableStateManager {

13
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignProcedure.java
View File

@ -27,13 +27,10 @@ import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.client.RetriesExhaustedException;
import org.apache.hadoop.hbase.client.TableState;
import org.apache.hadoop.hbase.exceptions.UnexpectedStateException;
import org.apache.hadoop.hbase.master.RegionState.State;
import org.apache.hadoop.hbase.master.TableStateManager;
import org.apache.hadoop.hbase.master.assignment.RegionStates.RegionStateNode;
import org.apache.hadoop.hbase.master.procedure.MasterProcedureEnv;
import org.apache.hadoop.hbase.master.procedure.RSProcedureDispatcher.RegionOpenOperation;
@ -153,13 +150,6 @@ public class AssignProcedure extends RegionTransitionProcedure {
LOG.info("Assigned, not reassigning; " + this + "; " + regionNode.toShortString());
return false;
}
// Don't assign if table is in disabling of disbled state.
TableStateManager tsm = env.getMasterServices().getTableStateManager();
TableName tn = regionNode.getRegionInfo().getTable();
if (tsm.isTableState(tn, TableState.State.DISABLING, TableState.State.DISABLED)) {
LOG.info("Table is state=" + tsm.getTableState(tn) + ", skipping " + this);
return false;
}
// If the region is SPLIT, we can't assign it. But state might be CLOSED, rather than
// SPLIT which is what a region gets set to when Unassigned as part of SPLIT. FIX.
if (regionNode.isInState(State.SPLIT) ||
@ -331,10 +321,9 @@ public class AssignProcedure extends RegionTransitionProcedure {
}
@Override
protected boolean remoteCallFailed(final MasterProcedureEnv env, final RegionStateNode regionNode,
protected void remoteCallFailed(final MasterProcedureEnv env, final RegionStateNode regionNode,
final IOException exception) {
handleFailure(env, regionNode);
return true;
}
@Override

22
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/RegionTransitionProcedure.java
View File

@ -165,13 +165,7 @@ public abstract class RegionTransitionProcedure
RegionStateNode regionNode, TransitionCode code, long seqId) throws UnexpectedStateException;
public abstract RemoteOperation remoteCallBuild(MasterProcedureEnv env, ServerName serverName);
/**
* @return True if processing of fail is complete; the procedure will be woken from its suspend
* and we'll go back to running through procedure steps:
* otherwise if false we leave the procedure in suspended state.
*/
protected abstract boolean remoteCallFailed(MasterProcedureEnv env,
protected abstract void remoteCallFailed(MasterProcedureEnv env,
RegionStateNode regionNode, IOException exception);
@Override
@ -187,16 +181,13 @@ public abstract class RegionTransitionProcedure
assert serverName.equals(regionNode.getRegionLocation());
String msg = exception.getMessage() == null? exception.getClass().getSimpleName():
exception.getMessage();
LOG.warn("Remote call failed " + this + "; " + regionNode.toShortString() +
"; exception=" + msg);
if (remoteCallFailed(env, regionNode, exception)) {
LOG.warn("Failed " + this + "; " + regionNode.toShortString() + "; exception=" + msg);
remoteCallFailed(env, regionNode, exception);
// NOTE: This call to wakeEvent puts this Procedure back on the scheduler.
// Thereafter, another Worker can be in here so DO NOT MESS WITH STATE beyond
// this method. Just get out of this current processing quickly.
env.getProcedureScheduler().wakeEvent(regionNode.getProcedureEvent());
}
// else leave the procedure in suspended state; it is waiting on another call to this callback
}
/**
* Be careful! At the end of this method, the procedure has either succeeded
@ -219,10 +210,9 @@ public abstract class RegionTransitionProcedure
// from remote regionserver. Means Procedure associated ProcedureEvent is marked not 'ready'.
env.getProcedureScheduler().suspendEvent(getRegionState(env).getProcedureEvent());
// Tricky because this the below call to addOperationToNode can fail. If it fails, we need to
// backtrack on stuff like the 'suspend' done above -- tricky as the 'wake' requeues us -- and
// ditto up in the caller; it needs to undo state changes. Inside in remoteCallFailed, it does
// wake to undo the above suspend.
// Tricky because this can fail. If it fails need to backtrack on stuff like
// the 'suspend' done above -- tricky as the 'wake' requeues us -- and ditto
// up in the caller; it needs to undo state changes.
if (!env.getRemoteDispatcher().addOperationToNode(targetServer, this)) {
remoteCallFailed(env, targetServer,
new FailedRemoteDispatchException(this + " to " + targetServer));

67
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/UnassignProcedure.java
View File

@ -22,7 +22,6 @@ package org.apache.hadoop.hbase.master.assignment;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ConnectException;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.commons.logging.Log;
@ -50,28 +49,18 @@ import org.apache.hadoop.hbase.regionserver.RegionServerStoppedException;
/**
* Procedure that describes the unassignment of a single region.
* There can only be one RegionTransitionProcedure -- i.e. an assign or an unassign -- per region
* running at a time, since each procedure takes a lock on the region.
* Procedure that describe the unassignment of a single region.
* There can only be one RegionTransitionProcedure per region running at the time,
* since each procedure takes a lock on the region.
*
* <p>The Unassign starts by placing a "close region" request in the Remote Dispatcher
* queue, and the procedure will then go into a "waiting state" (suspend).
* queue, and the procedure will then go into a "waiting state".
* The Remote Dispatcher will batch the various requests for that server and
* they will be sent to the RS for execution.
* The RS will complete the open operation by calling master.reportRegionStateTransition().
* The AM will intercept the transition report, and notify this procedure.
* The procedure will wakeup and finish the unassign by publishing its new state on meta.
* <p>If we are unable to contact the remote regionserver whether because of ConnectException
* or socket timeout, we will call expire on the server we were trying to contact. We will remain
* in suspended state waiting for a wake up from the ServerCrashProcedure that is processing the
* failed server. The basic idea is that if we notice a crashed server, then we have a
* responsibility; i.e. we should not let go of the region until we are sure the server that was
* hosting has had its crash processed. If we let go of the region before then, an assign might
* run before the logs have been split which would make for data loss.
*
* <p>TODO: Rather than this tricky coordination between SCP and this Procedure, instead, work on
* returning a SCP as our subprocedure; probably needs work on the framework to do this,
* especially if the SCP already created.
* The AM will intercept the transition report, and notify the procedure.
* The procedure will finish the unassign by publishing its new state on meta
* or it will retry the unassign.
*/
@InterfaceAudience.Private
public class UnassignProcedure extends RegionTransitionProcedure {
@ -86,6 +75,8 @@ public class UnassignProcedure extends RegionTransitionProcedure {
*/
protected volatile ServerName destinationServer;
protected final AtomicBoolean serverCrashed = new AtomicBoolean(false);
// TODO: should this be in a reassign procedure?
// ...and keep unassign for 'disable' case?
private boolean force;
@ -170,6 +161,15 @@ public class UnassignProcedure extends RegionTransitionProcedure {
return false;
}
// if the server is down, mark the operation as failed. region cannot be unassigned
// if server is down
if (serverCrashed.get() || !isServerOnline(env, regionNode)) {
LOG.warn("Server already down: " + this + "; " + regionNode.toShortString());
setFailure("source region server not online",
new ServerCrashException(getProcId(), regionNode.getRegionLocation()));
return false;
}
// if we haven't started the operation yet, we can abort
if (aborted.get() && regionNode.isInState(State.OPEN)) {
setAbortFailure(getClass().getSimpleName(), "abort requested");
@ -181,12 +181,12 @@ public class UnassignProcedure extends RegionTransitionProcedure {
// Add the close region operation the the server dispatch queue.
if (!addToRemoteDispatcher(env, regionNode.getRegionLocation())) {
// If addToRemoteDispatcher fails, it calls the callback #remoteCallFailed.
// If addToRemoteDispatcher fails, it calls #remoteCallFailed which
// does all cleanup.
}
// We always return true, even if we fail dispatch because addToRemoteDispatcher
// failure processing sets state back to REGION_TRANSITION_QUEUE so we come back in here again
// to probably go into the clause after waitOnServerCrashProcedure;
// failure processing sets state back to REGION_TRANSITION_QUEUE so we try again;
// i.e. return true to keep the Procedure running; it has been reset to startover.
return true;
}
@ -218,15 +218,13 @@ public class UnassignProcedure extends RegionTransitionProcedure {
}
@Override
protected boolean remoteCallFailed(final MasterProcedureEnv env, final RegionStateNode regionNode,
protected void remoteCallFailed(final MasterProcedureEnv env, final RegionStateNode regionNode,
final IOException exception) {
// TODO: Is there on-going rpc to cleanup?
if (exception instanceof ServerCrashException) {
// This exception comes from ServerCrashProcedure after log splitting.
// SCP found this region as a RIT. Its call into here says it is ok to let this procedure go
// on to a complete close now. This will release lock on this region so subsequent action on
// region can succeed; e.g. the assign that follows this unassign when a move (w/o wait on SCP
// the assign could run w/o logs being split so data loss).
// It is ok to let this procedure go on to complete close now.
// This will release lock on this region so the subsequent assign can succeed.
try {
reportTransition(env, regionNode, TransitionCode.CLOSED, HConstants.NO_SEQNUM);
} catch (UnexpectedStateException e) {
@ -239,22 +237,19 @@ public class UnassignProcedure extends RegionTransitionProcedure {
// TODO
// RS is aborting, we cannot offline the region since the region may need to do WAL
// recovery. Until we see the RS expiration, we should retry.
// TODO: This should be suspend like the below where we call expire on server?
LOG.info("Ignoring; waiting on ServerCrashProcedure", exception);
// serverCrashed.set(true);
} else if (exception instanceof NotServingRegionException) {
LOG.info("IS THIS OK? ANY LOGS TO REPLAY; ACTING AS THOUGH ALL GOOD " + regionNode,
exception);
LOG.info("IS THIS OK? ANY LOGS TO REPLAY; ACTING AS THOUGH ALL GOOD " + regionNode, exception);
setTransitionState(RegionTransitionState.REGION_TRANSITION_FINISH);
} else {
LOG.warn("Expiring server " + this + "; " + regionNode.toShortString() +
", exception=" + exception);
// TODO: kill the server in case we get an exception we are not able to handle
LOG.warn("Killing server; unexpected exception; " +
this + "; " + regionNode.toShortString() +
" exception=" + exception);
env.getMasterServices().getServerManager().expireServer(regionNode.getRegionLocation());
// Return false so this procedure stays in suspended state. It will be woken up by a
// ServerCrashProcedure when it notices this RIT.
// TODO: Add a SCP as a new subprocedure that we now come to depend on.
return false;
serverCrashed.set(true);
}
return true;
}
@Override

4
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/DisableTableProcedure.java
View File

@ -118,7 +118,7 @@ public class DisableTableProcedure
postDisable(env, state);
return Flow.NO_MORE_STATE;
default:
throw new UnsupportedOperationException("Unhandled state=" + state);
throw new UnsupportedOperationException("unhandled state=" + state);
}
} catch (IOException e) {
if (isRollbackSupported(state)) {
@ -147,7 +147,7 @@ public class DisableTableProcedure
}
// The delete doesn't have a rollback. The execution will succeed, at some point.
throw new UnsupportedOperationException("Unhandled state=" + state);
throw new UnsupportedOperationException("unhandled state=" + state);
}
@Override

2
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/RSProcedureDispatcher.java
View File

@ -197,7 +197,7 @@ public class RSProcedureDispatcher
}
// trying to send the request elsewhere instead
LOG.warn(String.format("Failed dispatch to server=%s try=%d",
LOG.warn(String.format("the request should be tried elsewhere instead; server=%s try=%d",
serverName, numberOfAttemptsSoFar), e);
return false;
}

3
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/ServerCrashException.java
View File

@ -23,8 +23,7 @@ import org.apache.hadoop.hbase.classification.InterfaceAudience;
/**
* Passed as Exception by {@link ServerCrashProcedure}
* notifying on-going RIT that server has failed. This exception is less an error-condition than
* it is a signal to waiting procedures that they can now proceed.
* notifying on-going RIT that server has failed.
*/
@InterfaceAudience.Private
@SuppressWarnings("serial")

3
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/ServerCrashProcedure.java
View File

@ -356,8 +356,7 @@ implements ServerProcedureInterface {
* Handle any outstanding RIT that are up against this.serverName, the crashed server.
* Notify them of crash. Remove assign entries from the passed in <code>regions</code>
* otherwise we have two assigns going on and they will fight over who has lock.
* Notify Unassigns. If unable to unassign because server went away, unassigns block waiting
* on the below callback from a ServerCrashProcedure before proceeding.
* Notify Unassigns also.
* @param env
* @param regions Regions that were on crashed server
*/

16
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestSplitTransactionOnCluster.java
View File

@ -403,16 +403,12 @@ public class TestSplitTransactionOnCluster {
for (HRegion d: daughters) {
LOG.info("Regions after crash: " + d);
}
if (daughters.size() != regions.size()) {
LOG.info("Daughters=" + daughters.size() + ", regions=" + regions.size());
}
assertEquals(daughters.size(), regions.size());
for (HRegion r: regions) {
LOG.info("Regions post crash " + r + ", contains=" + daughters.contains(r));
LOG.info("Regions post crash " + r);
assertTrue("Missing region post crash " + r, daughters.contains(r));
}
} finally {
LOG.info("EXITING");
admin.setBalancerRunning(true, false);
cluster.getMaster().setCatalogJanitorEnabled(true);
t.close();
@ -803,7 +799,7 @@ public class TestSplitTransactionOnCluster {
throws IOException, InterruptedException {
this.admin.splitRegion(hri.getRegionName());
for (int i = 0; this.cluster.getRegions(hri.getTable()).size() <= regionCount && i < 60; i++) {
LOG.debug("Waiting on region " + hri.getRegionNameAsString() + " to split");
LOG.debug("Waiting on region to split");
Thread.sleep(2000);
}
@ -831,12 +827,10 @@ public class TestSplitTransactionOnCluster {
// the table region serving server.
int metaServerIndex = cluster.getServerWithMeta();
assertTrue(metaServerIndex == -1); // meta is on master now
HRegionServer metaRegionServer = cluster.getRegionServer(metaServerIndex);
HRegionServer metaRegionServer = cluster.getMaster();
int tableRegionIndex = cluster.getServerWith(hri.getRegionName());
assertTrue(tableRegionIndex != -1);
HRegionServer tableRegionServer = cluster.getRegionServer(tableRegionIndex);
LOG.info("MetaRegionServer=" + metaRegionServer.getServerName() +
", other=" + tableRegionServer.getServerName());
if (metaRegionServer.getServerName().equals(tableRegionServer.getServerName())) {
HRegionServer hrs = getOtherRegionServer(cluster, metaRegionServer);
assertNotNull(hrs);
@ -854,8 +848,8 @@ public class TestSplitTransactionOnCluster {
tableRegionIndex + " and metaServerIndex=" + metaServerIndex);
Thread.sleep(100);
}
assertTrue("Region not moved off hbase:meta server, tableRegionIndex=" + tableRegionIndex,
tableRegionIndex != -1 && tableRegionIndex != metaServerIndex);
assertTrue("Region not moved off hbase:meta server", tableRegionIndex != -1
&& tableRegionIndex != metaServerIndex);
// Verify for sure table region is not on same server as hbase:meta
tableRegionIndex = cluster.getServerWith(hri.getRegionName());
assertTrue(tableRegionIndex != -1);