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https://issues.apache.org/jira/browse/BEAM-179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15229698#comment-15229698
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Kenneth Knowles commented on BEAM-179:
--------------------------------------
If that is the root cause, it is BEAM-31. Leaving this open, though, unless you
have confidence that is the cause.
> NullPointerException in AfterEach.shouldFire after restart with changed
> trigger
> -------------------------------------------------------------------------------
>
> Key: BEAM-179
> URL: https://issues.apache.org/jira/browse/BEAM-179
> Project: Beam
> Issue Type: Bug
> Components: runner-core
> Reporter: Mark Shields
> Assignee: Mark Shields
>
> Apr 6, 2016, 11:35:36 PM
> (1bbd1dc42a986f37): Exception: java.lang.NullPointerException
> com.google.cloud.dataflow.sdk.transforms.windowing.AfterEach.shouldFire(AfterEach.java:114)
>
> com.google.cloud.dataflow.sdk.util.ExecutableTrigger.invokeShouldFire(ExecutableTrigger.java:135)
>
> com.google.cloud.dataflow.sdk.transforms.windowing.Repeatedly.shouldFire(Repeatedly.java:84)
>
> com.google.cloud.dataflow.sdk.util.ExecutableTrigger.invokeShouldFire(ExecutableTrigger.java:135)
>
> com.google.cloud.dataflow.sdk.util.TriggerRunner.shouldFire(TriggerRunner.java:171)
>
> com.google.cloud.dataflow.sdk.util.ReduceFnRunner.emitIfAppropriate(ReduceFnRunner.java:653)
>
> com.google.cloud.dataflow.sdk.util.ReduceFnRunner.onTimer(ReduceFnRunner.java:564)
>
> com.google.cloud.dataflow.sdk.util.GroupAlsoByWindowViaWindowSetDoFn.processElement(GroupAlsoByWindowViaWindowSetDoFn.java:85)
>
> com.google.cloud.dataflow.sdk.util.SimpleDoFnRunner.invokeProcessElement(SimpleDoFnRunner.java:49)
>
> com.google.cloud.dataflow.sdk.util.DoFnRunnerBase.processElement(DoFnRunnerBase.java:138)
> Stack trace truncated. Please see Cloud Logging for the entire trace.
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