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https://issues.apache.org/jira/browse/NIFI-2551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15421666#comment-15421666
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ASF subversion and git services commented on NIFI-2551:
-------------------------------------------------------
Commit 6af768d0a133c63239e50213f69ee7d36d91448e in nifi's branch
refs/heads/master from [~markap14]
[ https://git-wip-us.apache.org/repos/asf?p=nifi.git;h=6af768d ]
NIFI-2551: Addressed a threading issue in the StandardResourceClaimManager and
performed some refactoring so that we can ensure thread-safety across different
components of the application, such as ProcessSession and WriteAheadFlowFile
Repository when interacting with the StandardResourceClaimManager. Update
DebugFlow to allow it to write to a FlowFile multiple times, which exposes the
concurrency bug. Also avoided calling ContentRepository.remove() from
ProcessSession whenever the content is no longer needed, as that can cause
problems now that the Resource Claim is backing the content claim.
> Rare condition causes FileSystemRepository NPE
> ----------------------------------------------
>
> Key: NIFI-2551
> URL: https://issues.apache.org/jira/browse/NIFI-2551
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 1.0.0, 0.7.0
> Reporter: Michael Moser
> Assignee: Mark Payne
> Priority: Blocker
> Fix For: 1.0.0, 0.8.0
>
>
> In rare unpredictable cases when NiFi is processing a heavy load, we see
> FileSystemRepository throw a NullPointerException
> {noformat}
> java.lang.NullPointerException
> at o.a.n.c.r.FileSystemRepository$2.write(FileSystemRepository.java:918)
> [nifi-framework-core-0.7.0.jar]
> at
> o.a.n.c.r.io.DisableOnCloseOutputStream.write(DisableOnCloseOutputStream.java:49)
> ....
> Suppressed: java.lang.NullPointerException
> at
> o.a.n.c.r.FileSystemRepository$2.flush(FileSystemRepository.java:934)
> [nifi-framework-core-0.7.0.jar]
> at
> o.a.n.c.r.io.DisableOnCloseOutputStream.close(DisableOnCloseOutputStream.java:68)
> {noformat}
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