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Fix queuing in AsyncLucenePersistedState (#50958) 

The logic in AsyncLucenePersistedState was flawed, unexpectedly queuing up two update tasks
in parallel.
This commit is contained in:
Yannick Welsch 2020-01-14 14:08:31 +01:00
parent 91d7b446a0
commit f1c5031766
1 changed files with 46 additions and 43 deletions
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89
server/src/main/java/org/elasticsearch/gateway/GatewayMetaState.java
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@ -46,7 +46,6 @@ import org.elasticsearch.common.collect.Tuple;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.util.concurrent.AbstractRunnable;
import org.elasticsearch.common.util.concurrent.EsExecutors;
import org.elasticsearch.common.util.concurrent.EsRejectedExecutionException;
import org.elasticsearch.common.util.concurrent.EsThreadPoolExecutor;
import org.elasticsearch.core.internal.io.IOUtils;
import org.elasticsearch.discovery.DiscoveryModule;
@ -356,7 +355,9 @@ public class GatewayMetaState implements Closeable {
} else {
logger.trace("queuing term update (setting term to {})", currentTerm);
newCurrentTermQueued = true;
scheduleUpdate();
if (newStateQueued == false) {
scheduleUpdate();
}
}
}
}
@ -370,55 +371,57 @@ public class GatewayMetaState implements Closeable {
} else {
logger.trace("queuing cluster state update (setting cluster state to {})", clusterState.version());
newStateQueued = true;
scheduleUpdate();
if (newCurrentTermQueued == false) {
scheduleUpdate();
}
}
}
}
private void scheduleUpdate() {
assert Thread.holdsLock(mutex);
try {
threadPoolExecutor.execute(new AbstractRunnable() {
assert threadPoolExecutor.getQueue().isEmpty() : "threadPoolExecutor queue not empty";
threadPoolExecutor.execute(new AbstractRunnable() {
@Override
public void onFailure(Exception e) {
logger.error("Exception occurred when storing new meta data", e);
}
@Override
protected void doRun() {
final Long term;
final ClusterState clusterState;
synchronized (mutex) {
if (newCurrentTermQueued) {
term = getCurrentTerm();
newCurrentTermQueued = false;
} else {
term = null;
}
if (newStateQueued) {
clusterState = getLastAcceptedState();
newStateQueued = false;
} else {
clusterState = null;
}
}
// write current term before last accepted state so that it is never below term in last accepted state
if (term != null) {
persistedState.setCurrentTerm(term);
}
if (clusterState != null) {
persistedState.setLastAcceptedState(resetVotingConfiguration(clusterState));
}
}
});
} catch (EsRejectedExecutionException e) {
// ignore cases where we are shutting down..., there is really nothing interesting to be done here...
if (threadPoolExecutor.isShutdown() == false) {
assert false : "only expect rejections when shutting down";
throw e;
@Override
public void onFailure(Exception e) {
logger.error("Exception occurred when storing new meta data", e);
}
}
@Override
public void onRejection(Exception e) {
assert threadPoolExecutor.isShutdown() : "only expect rejections when shutting down";
}
@Override
protected void doRun() {
final Long term;
final ClusterState clusterState;
synchronized (mutex) {
if (newCurrentTermQueued) {
term = getCurrentTerm();
logger.trace("resetting newCurrentTermQueued");
newCurrentTermQueued = false;
} else {
term = null;
}
if (newStateQueued) {
clusterState = getLastAcceptedState();
logger.trace("resetting newStateQueued");
newStateQueued = false;
} else {
clusterState = null;
}
}
// write current term before last accepted state so that it is never below term in last accepted state
if (term != null) {
persistedState.setCurrentTerm(term);
}
if (clusterState != null) {
persistedState.setLastAcceptedState(resetVotingConfiguration(clusterState));
}
}
});
}
static final CoordinationMetaData.VotingConfiguration staleStateConfiguration =