[ https://issues.apache.org/jira/browse/BEAM-833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15671180#comment-15671180 ] 

ASF GitHub Bot commented on BEAM-833:
-------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/incubator-beam/pull/1254


> Exercise Dynamic Splitting in the DirectRunner
> ----------------------------------------------
>
>                 Key: BEAM-833
>                 URL: https://issues.apache.org/jira/browse/BEAM-833
>             Project: Beam
>          Issue Type: Improvement
>          Components: runner-direct
>            Reporter: Thomas Groh
>            Assignee: Thomas Groh
>
> This primarily means calling the {{BoundedSource#splitAtFraction}} API during the evaluation of a BoundedReadEvaluatorFactory - this can return the work via addUnprocessedElements. 
> At a later point, the {{MonitorRunnable}} within {{ExecutorServiceParallelExecutor}} can examine currently evaluating work and invoke a {{TransformExecutor#split}} method, which can return to the runner some amount of input, which can be scheduled to use more of the available threads.



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