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https://issues.apache.org/jira/browse/BEAM-65?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15570384#comment-15570384
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ASF GitHub Bot commented on BEAM-65:
------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/incubator-beam/pull/896


> SplittableDoFn
> --------------
>
>                 Key: BEAM-65
>                 URL: https://issues.apache.org/jira/browse/BEAM-65
>             Project: Beam
>          Issue Type: New Feature
>          Components: beam-model
>            Reporter: Daniel Halperin
>            Assignee: Eugene Kirpichov
>            Priority: Minor
>
> SplittableDoFn is a proposed enhancement for "dynamically splittable work" to 
> the Beam model.
> Among other things, it would allow a unified implementation of 
> bounded/unbounded sources with dynamic work rebalancing and the ability to 
> express multiple scalable steps (e.g., global expansion -> file sizing & 
> parsing -> splitting files into independently-processable blocks) via 
> composition rather than inheritance.
> This would make it much easier to implement many types of sources, to modify 
> and reuse existing sources. Also, it would improve scalability of the Beam 
> model by moving things like splitting a source from the control plane (where 
> it is today -- glob -> List<FileBasedSource> sent over service APIs) into the 
> data plane (PCollection<Glob> -> PCollection<FileName> -> ...).



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