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https://issues.apache.org/jira/browse/FLINK-1017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14098318#comment-14098318
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Fabian Hueske commented on FLINK-1017:
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With {{env.setDefaultLocalParallelism(3)} each task of a job will be executed
with a DOP of 3 if no parallelism is specified on task-level.
You are right, that this will result in three parallel task pipelines of
DataSource -> Map -> Reduce -> DataSink.
If you increase the DOP of the DataSink ({{counts.print().setParallelism(4);}},
the result will be written with four threads (0>,1>,2>, and 3>).
It is not possible to specify which keys should be processed by which thread.
> Add setParallelism() to Java API documentation
> ----------------------------------------------
>
> Key: FLINK-1017
> URL: https://issues.apache.org/jira/browse/FLINK-1017
> Project: Flink
> Issue Type: Task
> Components: Documentation
> Affects Versions: 0.6-incubating, pre-apache-0.5
> Reporter: Fabian Hueske
> Assignee: Hung Chang
> Priority: Minor
> Labels: starter
> Fix For: 0.6-incubating
>
>
> The Java API offers {{setParallelism()}} to control the degree of parallelism
> for each operator. This feature is not documented and should be added.
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