[BEAM-5997] EVENT_TIME timer throws exception when side input used

• Type: Bug
• Status: Open
• Priority: P3
• Resolution: Unresolved
• Affects Version/s: 2.7.0
• Component/s: runner-direct
• Assignee: Unassigned
• Reporter: Laura Llewellyn
• Created: 06/Nov/18 17:05
• Updated: 03/Jun/22 22:58

Description

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)