Chetan Mehrotra created OAK-4687:
------------------------------------
Summary: Issue with backgroundOperationLock handling in exception
case
Key: OAK-4687
URL: https://issues.apache.org/jira/browse/OAK-4687
Project: Jackrabbit Oak
Issue Type: Bug
Components: documentmk
Reporter: Chetan Mehrotra
Assignee: Marcel Reutegger
Priority: Minor
Fix For: 1.6
If in a commit some exception occurs then that exception gets hidden due to
error in exception handling code path in DocumentNodeStore
Instead of original exception following exception is seen
{noformat}
Caused by: java.lang.IllegalMonitorStateException: attempt to unlock read lock,
not locked by current thread
at
java.util.concurrent.locks.ReentrantReadWriteLock$Sync.unmatchedUnlockException(ReentrantReadWriteLock.java:447)
at
java.util.concurrent.locks.ReentrantReadWriteLock$Sync.tryReleaseShared(ReentrantReadWriteLock.java:431)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer.releaseShared(AbstractQueuedSynchronizer.java:1340)
at
java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.unlock(ReentrantReadWriteLock.java:883)
at
org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.canceled(DocumentNodeStore.java:767)
at
org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreBranch.persist(DocumentNodeStoreBranch.java:303)
at
org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreBranch.persist(DocumentNodeStoreBranch.java:268)
at
org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreBranch.access$300(DocumentNodeStoreBranch.java:58)
at
org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreBranch$InMemory.merge(DocumentNodeStoreBranch.java:513)
... 36 more
{noformat}
This happens because the lock is released twice
# Once in DocumentNodeStore#done
# Second in DocumentNodeStore#canceled. Invoked in case of failure in
DocumentNodeStoreBranch#persist
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