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https://issues.apache.org/jira/browse/BEAM-5997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17122213#comment-17122213
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Kenneth Knowles commented on BEAM-5997:
---------------------------------------
This issue is assigned but has not received an update in 30 days so it has been
labeled "stale-assigned". If you are still working on the issue, please give an
update and remove the label. If you are no longer working on the issue, please
unassign so someone else may work on it. In 7 days the issue will be
automatically unassigned.
> EVENT_TIME timer throws exception when side input used
> ------------------------------------------------------
>
> Key: BEAM-5997
> URL: https://issues.apache.org/jira/browse/BEAM-5997
> Project: Beam
> Issue Type: Bug
> Components: runner-direct
> Affects Versions: 2.7.0
> Reporter: Laura Llewellyn
> Assignee: Daniel Oliveira
> Priority: P1
> Labels: stale-assigned
> Attachments: TestExpiry.java
>
>
> Receive this exception when using a DoFn containing an EVENT_TIME timer and
> passing a side input. Pipeline processing aborts. It works as expected when
> the side input is absent.
> {code:java}
> 2018-11-06-12:03:32 ERROR o.a.b.r.direct.QuiescenceDriver - Internal Error
> while delivering timers
> java.lang.IllegalArgumentException: expected one element but was:
> <TestExpiry/TestingExpiry/ParMultiDo(TestExpiry)/To
> KeyedWorkItem/ParMultiDo(ToKeyedWorkItem).output [PCollection],
> TestExpiry/View.AsList/View.VoidKeyToMultimapMaterialization/ParDo(VoidKeyToMultimapMaterialization)/ParMultiDo(VoidKeyToMultimapMaterialization).output
> [PCollection]>
> at
> org.apache.beam.repackaged.beam_runners_direct_java.com.google.common.collect.Iterators.getOnlyElement(Iterators.java:322)
> at
> org.apache.beam.repackaged.beam_runners_direct_java.com.google.common.collect.Iterables.getOnlyElement(Iterables.java:294)
> at
> org.apache.beam.runners.direct.QuiescenceDriver.fireTimers(QuiescenceDriver.java:167)
> at
> org.apache.beam.runners.direct.QuiescenceDriver.drive(QuiescenceDriver.java:110)
> at
> org.apache.beam.runners.direct.ExecutorServiceParallelExecutor$2.run(ExecutorServiceParallelExecutor.java:170)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> {code}
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