[GitHub] [beam] kennknowles opened a new issue, #19216: EVENT_TIME timer throws exception when side input used

[GitBox <gi...@apache.org>]

kennknowles opened a new issue, #19216:
URL: https://github.com/apache/beam/issues/19216

   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.
   ```
   
   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)
   
   
   ```
   
   
   Imported from Jira [BEAM-5997](https://issues.apache.org/jira/browse/BEAM-5997). Original Jira may contain additional context.
   Reported by: laurallew.


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