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https://issues.apache.org/jira/browse/BEAM-65?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15854916#comment-15854916
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ASF GitHub Bot commented on BEAM-65:
------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/beam/pull/1895
> 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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