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Posted to commits@beam.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2018/08/02 15:52:00 UTC
[jira] [Work logged] (BEAM-4798) IndexOutOfBoundsException when
Flink parallelism > 1
[ https://issues.apache.org/jira/browse/BEAM-4798?focusedWorklogId=130298&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-130298 ]
ASF GitHub Bot logged work on BEAM-4798:
----------------------------------------
Author: ASF GitHub Bot
Created on: 02/Aug/18 15:51
Start Date: 02/Aug/18 15:51
Worklog Time Spent: 10m
Work Description: aaltay commented on issue #5996: [BEAM-4798] Fix IndexOutOfBoundsException in Flink runner
URL: https://github.com/apache/beam/pull/5996#issuecomment-409975329
Adding a unit test makes sense to me.
@aromanenko-dev are you unblocked? Do you need help?
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Issue Time Tracking
-------------------
Worklog Id: (was: 130298)
Time Spent: 2h (was: 1h 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
> Time Spent: 2h
> 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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