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Concurrent calls to refresh might result in "dangling" searchers, closes #823.

This commit is contained in:
kimchy 2011-04-01 22:43:48 +03:00
parent 1280512097
commit db1dcaded3
1 changed files with 16 additions and 10 deletions
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8
modules/elasticsearch/src/main/java/org/elasticsearch/index/engine/robin/RobinEngine.java
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@ -128,6 +128,8 @@ public class RobinEngine extends AbstractIndexShardComponent implements Engine {
private final Object[] dirtyLocks; private final Object[] dirtyLocks;
private final Object refreshMutex = new Object();
private final ApplySettings applySettings = new ApplySettings(); private final ApplySettings applySettings = new ApplySettings();
@Inject public RobinEngine(ShardId shardId, @IndexSettings Settings indexSettings, IndexSettingsService indexSettingsService, @Inject public RobinEngine(ShardId shardId, @IndexSettings Settings indexSettings, IndexSettingsService indexSettingsService,
@ -577,8 +579,11 @@ public class RobinEngine extends AbstractIndexShardComponent implements Engine {
throw new EngineClosedException(shardId); throw new EngineClosedException(shardId);
} }
try { try {
// we need to obtain a mutex here, to make sure we don't leave dangling readers
// we could have used an AtomicBoolean#compareAndSet, but, then we might miss refresh requests
// compared to on going ones
synchronized (refreshMutex) {
if (dirty || refresh.force()) { if (dirty || refresh.force()) {
// we eagerly set dirty to false so we won't miss refresh requests
dirty = false; dirty = false;
AcquirableResource<ReaderSearcherHolder> current = nrtResource; AcquirableResource<ReaderSearcherHolder> current = nrtResource;
IndexReader newReader = current.resource().reader().reopen(true); IndexReader newReader = current.resource().reader().reopen(true);
@ -589,6 +594,7 @@ public class RobinEngine extends AbstractIndexShardComponent implements Engine {
current.markForClose(); current.markForClose();
} }
} }
}
} catch (AlreadyClosedException e) { } catch (AlreadyClosedException e) {
// an index writer got replaced on us, ignore // an index writer got replaced on us, ignore
} catch (Exception e) { } catch (Exception e) {