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From "Greg Hogan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-7019) Rework parallelism in Gelly algorithms and examples
Date Tue, 27 Jun 2017 15:19:00 GMT
Greg Hogan created FLINK-7019:
---------------------------------

             Summary: 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 generated 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 and
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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