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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7019) Rework parallelism in Gelly algorithms and examples
Date Tue, 11 Jul 2017 13:59:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16082235#comment-16082235
] 

ASF GitHub Bot commented on FLINK-7019:
---------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/flink/pull/4282


> Rework parallelism in Gelly algorithms and examples
> ---------------------------------------------------
>
>                 Key: FLINK-7019
>                 URL: https://issues.apache.org/jira/browse/FLINK-7019
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Gelly
>    Affects Versions: 1.4.0
>            Reporter: Greg Hogan
>            Assignee: Greg Hogan
>            Priority: Minor
>             Fix For: 1.4.0
>
>
> Flink job parallelism is set with {{ExecutionConfig#setParallelism}} or when {{-p}} on
the command-line. The Gelly algorithms {{JaccardIndex}}, {{AdamicAdar}}, {{TriangleListing}},
and {{ClusteringCoefficient}} have intermediate operators which generate output quadratic
in the size of input. These algorithms may need to be run with a high parallelism but doing
so for all operations is wasteful. Thus was introduced "little parallelism".
> This can be simplified by moving the parallelism parameter to the new common base class
with the rule-of-thumb to use the algorithm parallelism for all normal (small output) operators.
The asymptotically large operators will default to the job parallelism, as will the default
algorithm parallelism.



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