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https://issues.apache.org/jira/browse/NIFI-3036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16031398#comment-16031398
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Joseph Witt commented on NIFI-3036:
-----------------------------------
very possibly related to this fix
https://issues.apache.org/jira/browse/NIFI-3671
> Resource Claim can violate its "isInUse" assumption causing Null Pointer
> Exceptions
> -----------------------------------------------------------------------------------
>
> Key: NIFI-3036
> URL: https://issues.apache.org/jira/browse/NIFI-3036
> Project: Apache NiFi
> Issue Type: Bug
> Reporter: Joseph Percivall
> Assignee: Mark Payne
> Priority: Blocker
> Fix For: 1.1.0
>
>
> I hit a Null Pointer Exception when testing on the lastest master. After
> digging I believe the root cause to be the assumption explained here[1] being
> violated.
> Specifically I was replaying events on a disk that was over the threshold for
> not archiving and seeing this[2] stacktrace. So the claimnant count was
> increased from 0 when "isWritable" was false causing the ResourceClaim to
> still be a key in the "writeableClaimStreams" map but have a value of null.
> I have tested on 1.0.0 and was not able to reproduce.
> [1]
> https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-core/src/main/java/org/apache/nifi/controller/repository/claim/StandardResourceClaim.java#L142-L142
> [2] 2016-11-14 16:00:19,783 INFO [Flow Service Tasks Thread-2]
> o.a.nifi.controller.StandardFlowService Saved flow controller
> org.apache.nifi.controller.FlowController@6191c12d // Another save pending =
> false
> 2016-11-14 16:00:21,016 INFO [StandardProcessScheduler Thread-4]
> o.a.n.c.s.TimerDrivenSchedulingAgent Scheduled
> GenerateFlowFile[id=01581004-90ba-149c-7ccc-4fe3d2dcfe12] to run with 1
> threads
> 2016-11-14 16:00:21,017 ERROR [Timer-Driven Process Thread-8]
> o.a.n.p.standard.GenerateFlowFile
> GenerateFlowFile[id=01581004-90ba-149c-7ccc-4fe3d2dcfe12]
> GenerateFlowFile[id=01581004-90ba-149c-7ccc-4fe3d2dcfe12] failed to process
> due to java.lang.NullPointerException; rolling back session:
> java.lang.NullPointerException
> 2016-11-14 16:00:21,018 ERROR [Timer-Driven Process Thread-8]
> o.a.n.p.standard.GenerateFlowFile
> java.lang.NullPointerException: null
> at
> org.apache.nifi.controller.repository.FileSystemRepository$2.write(FileSystemRepository.java:907)
> ~[nifi-framework-core-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
> at
> org.apache.nifi.controller.repository.io.DisableOnCloseOutputStream.write(DisableOnCloseOutputStream.java:49)
> ~[nifi-framework-core-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
> at
> org.apache.nifi.controller.repository.io.ByteCountingOutputStream.write(ByteCountingOutputStream.java:46)
> ~[nifi-framework-core-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
> at
> org.apache.nifi.controller.repository.io.ByteCountingOutputStream.write(ByteCountingOutputStream.java:41)
> ~[nifi-framework-core-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
> at
> org.apache.nifi.controller.repository.io.FlowFileAccessOutputStream.write(FlowFileAccessOutputStream.java:78)
> ~[nifi-framework-core-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
> at
> org.apache.nifi.processors.standard.GenerateFlowFile$1.process(GenerateFlowFile.java:192)
> ~[nifi-standard-processors-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
> at
> org.apache.nifi.controller.repository.StandardProcessSession.write(StandardProcessSession.java:2321)
> ~[nifi-framework-core-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
> at
> org.apache.nifi.processors.standard.GenerateFlowFile.onTrigger(GenerateFlowFile.java:189)
> ~[nifi-standard-processors-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
> at
> org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
> ~[nifi-api-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
> at
> org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1089)
> [nifi-framework-core-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
> at
> org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:136)
> [nifi-framework-core-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
> at
> org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:47)
> [nifi-framework-core-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
> at
> org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:132)
> [nifi-framework-core-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> [na:1.8.0_74]
> at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
> [na:1.8.0_74]
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
> [na:1.8.0_74]
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
> [na:1.8.0_74]
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> [na:1.8.0_74]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> [na:1.8.0_74]
> at java.lang.Thread.run(Thread.java:745) [na:1.8.0_74]
> Suppressed: java.lang.NullPointerException: null
> at
> org.apache.nifi.controller.repository.FileSystemRepository$2.flush(FileSystemRepository.java:923)
> ~[nifi-framework-core-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
> at
> org.apache.nifi.controller.repository.io.DisableOnCloseOutputStream.close(DisableOnCloseOutputStream.java:68)
> ~[nifi-framework-core-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
> at
> org.apache.nifi.controller.repository.io.ByteCountingOutputStream.close(ByteCountingOutputStream.java:61)
> ~[nifi-framework-core-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
> at
> org.apache.nifi.controller.repository.StandardProcessSession.write(StandardProcessSession.java:2322)
> ~[nifi-framework-core-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
> ... 13 common frames omitted
> Suppressed: java.lang.NullPointerException: null
> at
> org.apache.nifi.controller.repository.FileSystemRepository$2.flush(FileSystemRepository.java:923)
> ~[nifi-framework-core-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
> at
> org.apache.nifi.controller.repository.io.DisableOnCloseOutputStream.close(DisableOnCloseOutputStream.java:68)
> ~[nifi-framework-core-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
> at
> org.apache.nifi.controller.repository.StandardProcessSession.write(StandardProcessSession.java:2322)
> ~[nifi-framework-core-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
> ... 13 common frames omitted
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