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https://issues.apache.org/jira/browse/FLINK-2318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15025495#comment-15025495
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Fabian Hueske commented on FLINK-2318:
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I think it would be good to have this fix also into the {{release-0.10}} branch.
> BroadcastVariable of unioned data set fails
> -------------------------------------------
>
> Key: FLINK-2318
> URL: https://issues.apache.org/jira/browse/FLINK-2318
> Project: Flink
> Issue Type: Bug
> Components: Distributed Runtime, Optimizer
> Affects Versions: 0.9
> Reporter: Fabian Hueske
> Assignee: Chesnay Schepler
>
> Using a unioned data set as broadcast variable such as this:
> {code}
> DataSet d1 = [...]
> DataSet d2 = [...]
> DataSet d3 = [...]
> d1
> .map(new MyMapper())
> .withBroadcastSet(d2.union(d3), "myBroadcast");
> {code}
> throws an exception at runtime:
> {code}
> java.lang.Exception: Call to registerInputOutput() of invokable failed
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:504)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.RuntimeException: Initializing the input streams failed
> in Task MapPartition (MapPartition at
> translatHashJoinAsMap(FlinkFlowStep.java:755)): Illegal input group size in
> task configuration: -1
> at
> org.apache.flink.runtime.operators.RegularPactTask.registerInputOutput(RegularPactTask.java:246)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:501)
> ... 1 more
> Caused by: java.lang.Exception: Illegal input group size in task
> configuration: -1
> at
> org.apache.flink.runtime.operators.RegularPactTask.initBroadcastInputReaders(RegularPactTask.java:783)
> at
> org.apache.flink.runtime.operators.RegularPactTask.registerInputOutput(RegularPactTask.java:243)
> ... 2 more
> {code}
> A simple workaround is to apply an identity mapper on the unioned data set.
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