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https://issues.apache.org/jira/browse/BEAM-47?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15221977#comment-15221977
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Daniel Halperin commented on BEAM-47:
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(SplittableDoFn could make this obsolete)
> UnboundedSource should support dynamic work rebalancing
> -------------------------------------------------------
>
> Key: BEAM-47
> URL: https://issues.apache.org/jira/browse/BEAM-47
> Project: Beam
> Issue Type: New Feature
> Components: sdk-java-extensions
> Reporter: Daniel Halperin
>
> BoundedSource has splitAtFraction and related code to enable large work items
> to be split dynamically and moved to other workers.
> UnboundedSource does not have this support -- instead, runners are expected
> to allocate many splits initially and rebalance those between workers.
> We should add dynamic work rebalancing to UnboundedSource. This will almost
> certainly be done by checkpointing the source, and then the dynamically
> produced splits will both inherit the checkpoint (or a split-adapted version
> of it).
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