Chetan Mehrotra created OAK-3098:
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Summary: CopyOnWrite might block Async indexer thread indefinitely
Key: OAK-3098
URL: https://issues.apache.org/jira/browse/OAK-3098
Project: Jackrabbit Oak
Issue Type: Bug
Components: lucene
Reporter: Chetan Mehrotra
Assignee: Chetan Mehrotra
Priority: Minor
Fix For: 1.2.4, 1.3.3, 1.0.18
CopyOnWrite logic uses a CountDownLatch to sync up on close call. In case of
config change which might lead to closing of the the IndexCopier this latch
might not be released causing the async index thread to hang
{noformat}
sun.misc.Unsafe.park(Native Method)
java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:994)
java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1303)
java.util.concurrent.CountDownLatch.await(CountDownLatch.java:236)
org.apache.jackrabbit.oak.plugins.index.lucene.IndexCopier$CopyOnWriteDirectory.close(IndexCopier.java:648)
org.apache.jackrabbit.oak.plugins.index.lucene.LuceneIndexEditorContext.closeWriter(LuceneIndexEditorContext.java:196)
org.apache.jackrabbit.oak.plugins.index.lucene.LuceneIndexEditor.leave(LuceneIndexEditor.java:207)
org.apache.jackrabbit.oak.plugins.index.IndexUpdate.leave(IndexUpdate.java:219)
org.apache.jackrabbit.oak.spi.commit.VisibleEditor.leave(VisibleEditor.java:63)
org.apache.jackrabbit.oak.spi.commit.EditorDiff.process(EditorDiff.java:56)
org.apache.jackrabbit.oak.plugins.index.AsyncIndexUpdate.updateIndex(AsyncIndexUpdate.java:366)
org.apache.jackrabbit.oak.plugins.index.AsyncIndexUpdate.run(AsyncIndexUpdate.java:311)
org.apache.sling.commons.scheduler.impl.QuartzJobExecutor.execute(QuartzJobExecutor.java:105)
org.quartz.core.JobRunShell.run(JobRunShell.java:207)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
java.lang.Thread.run(Thread.java:745)
{noformat}
Ideally this latch should have a timeout or closing logic of IndexCopier
ensures that this is released
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