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https://issues.apache.org/jira/browse/NIFI-4167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16080825#comment-16080825
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ASF GitHub Bot commented on NIFI-4167:
--------------------------------------
Github user mcgilman commented on the issue:
https://github.com/apache/nifi/pull/1996
Thanks @markap14! This has been merged to master.
> Occasional deadlock when trying to clean up old Content Claims
> --------------------------------------------------------------
>
> Key: NIFI-4167
> URL: https://issues.apache.org/jira/browse/NIFI-4167
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Reporter: Mark Payne
> Assignee: Mark Payne
> Priority: Critical
> Fix For: 1.4.0
>
>
> Occasionally we'll see the Content Repository stop cleaning up old claims. A
> thread dump shows:
> {code}
> "FileSystemRepository Workers Thread-3" Id=97 BLOCKED on
> org.apache.nifi.controller.repository.claim.StandardResourceClaim@6b5aa020
> at
> org.apache.nifi.controller.repository.claim.StandardResourceClaimManager.getClaimantCount(StandardResourceClaimManager.java:73)
>
> at
> org.apache.nifi.controller.repository.claim.StandardResourceClaim.isInUse(StandardResourceClaim.java:120)
>
> at
> org.apache.nifi.controller.repository.FileSystemRepository.remove(FileSystemRepository.java:612)
>
> at
> org.apache.nifi.controller.repository.FileSystemRepository.access$1200(FileSystemRepository.java:83)
>
> at
> org.apache.nifi.controller.repository.FileSystemRepository$ArchiveOrDestroyDestructableClaims.run(FileSystemRepository.java:1442)
>
> {code}
> While another thread shows that it's being marked as Destructable:
> {code}
> "pool-10-thread-1" Id=132 TIMED_WAITING on
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@38063d7e
>
> at sun.misc.Unsafe.park(Native Method)
> at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
>
> at
> java.util.concurrent.LinkedBlockingQueue.offer(LinkedBlockingQueue.java:385)
> at
> org.apache.nifi.controller.repository.claim.StandardResourceClaimManager.markDestructable(StandardResourceClaimManager.java:152)
>
> - waiting on
> org.apache.nifi.controller.repository.claim.StandardResourceClaim@6b5aa020
> at
> org.apache.nifi.controller.repository.WriteAheadFlowFileRepository.markDestructable(WriteAheadFlowFileRepository.java:186)
>
> at
> org.apache.nifi.controller.repository.WriteAheadFlowFileRepository.onGlobalSync(WriteAheadFlowFileRepository.java:287)
>
> at
> org.wali.MinimalLockingWriteAheadLog.checkpoint(MinimalLockingWriteAheadLog.java:565)
>
> - waiting on org.wali.MinimalLockingWriteAheadLog@65ab87e4
> at
> org.apache.nifi.controller.repository.WriteAheadFlowFileRepository.checkpoint(WriteAheadFlowFileRepository.java:416)
>
> {code}
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