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https://issues.apache.org/jira/browse/BEAM-4798?focusedWorklogId=125411&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-125411
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ASF GitHub Bot logged work on BEAM-4798:
----------------------------------------
Author: ASF GitHub Bot
Created on: 20/Jul/18 09:23
Start Date: 20/Jul/18 09:23
Worklog Time Spent: 10m
Work Description: aljoscha commented on a change in pull request #5996:
[BEAM-4798] Fix IndexOutOfBoundsException in Flink runner
URL: https://github.com/apache/beam/pull/5996#discussion_r203985951
##########
File path:
runners/flink/src/main/java/org/apache/beam/runners/flink/translation/wrappers/streaming/io/UnboundedSourceWrapper.java
##########
@@ -202,7 +202,15 @@ public void
run(SourceContext<WindowedValue<ValueWithRecordId<OutputT>>> ctx) th
ReaderInvocationUtil<OutputT, UnboundedSource.UnboundedReader<OutputT>>
readerInvoker =
new ReaderInvocationUtil<>(stepName, serializedOptions.get(),
metricContainer);
- if (localReaders.size() == 1) {
+ if (localReaders.size() == 0) {
+ // It can happen when value of parallelism is greater than number of IO
readers (for example,
+ // parallelism is 2 and number of Kafka topic partitions is 1). In this
case, we just idle
+ // this executor.
+ LOG.warn("Number of readers is 0, idle");
Review comment:
Probably shouldn't even be a warning, since it's a completely normal thing
that can just happen
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Issue Time Tracking
-------------------
Worklog Id: (was: 125411)
> 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: 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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