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https://issues.apache.org/jira/browse/BEAM-4798?focusedWorklogId=133616&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-133616
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ASF GitHub Bot logged work on BEAM-4798:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 10/Aug/18 14:40
            Start Date: 10/Aug/18 14:40
    Worklog Time Spent: 10m 
      Work Description: aljoscha commented on issue #6177: [BEAM-4798] Fix 
IndexOutOfBoundsException in Flink runner
URL: https://github.com/apache/beam/pull/6177#issuecomment-412102915
 
 
   thanks @tweise !
   
   And thanks @aromanenko-dev for discovering and fixing it! 

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Issue Time Tracking
-------------------

    Worklog Id:     (was: 133616)
    Time Spent: 4h 40m  (was: 4.5h)

> IndexOutOfBoundsException when Flink parallelism > 1
> ----------------------------------------------------
>
>                 Key: BEAM-4798
>                 URL: https://issues.apache.org/jira/browse/BEAM-4798
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-flink
>    Affects Versions: 2.4.0, 2.5.0
>            Reporter: Alexey Romanenko
>            Assignee: Alexey Romanenko
>            Priority: Major
>             Fix For: 2.7.0
>
>          Time Spent: 4h 40m
>  Remaining Estimate: 0h
>
> Running job on Flink in streaming mode and get data from a Kafka topic with 
> parallelism > 1 causes an exception:
> {noformat}
> Caused by: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
>       at java.util.ArrayList.rangeCheck(ArrayList.java:657)
>       at java.util.ArrayList.get(ArrayList.java:433)
>       at 
> org.apache.beam.runners.flink.translation.wrappers.streaming.io.UnboundedSourceWrapper.run(UnboundedSourceWrapper.java:277)
>       at 
> org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:87)
>       at 
> org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:56)
>       at 
> org.apache.flink.streaming.runtime.tasks.SourceStreamTask.run(SourceStreamTask.java:99)
>       at 
> org.apache.flink.streaming.runtime.tasks.StoppableSourceStreamTask.run(StoppableSourceStreamTask.java:45)
>       at 
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:306)
>       at org.apache.flink.runtime.taskmanager.Task.run(Task.java:703)
>       at java.lang.Thread.run(Thread.java:748)
> {noformat}
> It happens when number of Kafka topic partitions is less than value of 
> parallelism (number of task slots).
> So, workaround for now can be to set parallelism <= number of topic 
> partitions, thus if parallelism=2 then number_partitions >= 2



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