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https://issues.apache.org/jira/browse/BEAM-4798?focusedWorklogId=133624&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-133624
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ASF GitHub Bot logged work on BEAM-4798:
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Author: ASF GitHub Bot
Created on: 10/Aug/18 14:52
Start Date: 10/Aug/18 14:52
Worklog Time Spent: 10m
Work Description: aromanenko-dev edited a comment on issue #5996:
[BEAM-4798] Fix IndexOutOfBoundsException in Flink runner
URL: https://github.com/apache/beam/pull/5996#issuecomment-411058069
@aljoscha Thank you! As we discussed on Slack, after renaming the test class
name, I've managed to run parameterized tests but they still pass without my
fix. Although, some of them have to fail where `numSplits < numTasks`
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Issue Time Tracking
-------------------
Worklog Id: (was: 133624)
Time Spent: 5h (was: 4h 50m)
> 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: 5h
> 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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