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From "Daniel Halperin (JIRA)" <>
Subject [jira] [Commented] (BEAM-47) UnboundedSource should support dynamic work rebalancing
Date Fri, 01 Apr 2016 17:00:28 GMT


Daniel Halperin commented on BEAM-47:

I don't think so. SplittableDoFn is a replacement for the PTransforms that
wrap UnboundedSource, not UnboundedSource itself.

On Fri, Apr 1, 2016 at 9:58 AM, Eugene Kirpichov (JIRA) <>

> UnboundedSource should support dynamic work rebalancing
> -------------------------------------------------------
>                 Key: BEAM-47
>                 URL:
>             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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