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https://issues.apache.org/jira/browse/BEAM-4798?focusedWorklogId=131329&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-131329
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ASF GitHub Bot logged work on BEAM-4798:
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Author: ASF GitHub Bot
Created on: 06/Aug/18 07:46
Start Date: 06/Aug/18 07:46
Worklog Time Spent: 10m
Work Description: aromanenko-dev commented on issue #5996: [BEAM-4798]
Fix IndexOutOfBoundsException in Flink runner
URL: https://github.com/apache/beam/pull/5996#issuecomment-410618426
@aljoscha @aaltay Sorry for delay with response, I was on vacation for last
two weeks. Now I'm back and, in the first order, I'd like to find out why
already existed tests were not failed because they are supposed to cover this
test case (when the number of IO readers is less than value of Flink
parallelism value).
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Issue Time Tracking
-------------------
Worklog Id: (was: 131329)
Time Spent: 2h 10m (was: 2h)
> 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
> Time Spent: 2h 10m
> 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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