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https://issues.apache.org/jira/browse/FLINK-1959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14519542#comment-14519542
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Stephan Ewen commented on FLINK-1959:
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Can you try if this only happens with a parallelism greater than one, or also
with parallelism one?
> Accumulators BROKEN after Partitioning
> --------------------------------------
>
> Key: FLINK-1959
> URL: https://issues.apache.org/jira/browse/FLINK-1959
> Project: Flink
> Issue Type: Bug
> Components: Examples
> Affects Versions: 0.8.1
> Reporter: mustafa elbehery
> Priority: Critical
> Fix For: 0.8.1
>
>
> while running the Accumulator example in
> https://github.com/Elbehery/flink/blob/master/flink-examples/flink-java-examples/src/main/java/org/apache/flink/examples/java/relational/EmptyFieldsCountAccumulator.java,
>
> I tried to alter the data flow with "PartitionByHash" function before
> applying "Filter", and the resulted accumulator was NULL.
> By Debugging, I could see the accumulator in the RunTime Map. However, by
> retrieving the accumulator from the JobExecutionResult object, it was NULL.
> The line caused the problem is "file.partitionByHash(1).filter(new
> EmptyFieldFilter())" instead of "file.filter(new EmptyFieldFilter())"
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