[jira] [Created] (FLINK-2318) BroadcastVariable of unioned data set fails

["Fabian Hueske (JIRA)" <ji...@apache.org>]

Fabian Hueske created FLINK-2318:
------------------------------------

             Summary: 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


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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