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https://issues.apache.org/jira/browse/BEAM-106?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16911481#comment-16911481
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Luke Cwik commented on BEAM-106:
--------------------------------
Unroll the loop some fixed number of iterations. If any records make it to the
last iteration, either save those and re-read them in a new pipeline so that it
goes through more iterations or rerun the original pipeline with the loop
unrolled with a higher number of iterations.
> Native support for conditional iteration
> ----------------------------------------
>
> Key: BEAM-106
> URL: https://issues.apache.org/jira/browse/BEAM-106
> Project: Beam
> Issue Type: New Feature
> Components: sdk-ideas
> Reporter: Luke Cwik
> Priority: Major
>
> Ported from: https://github.com/GoogleCloudPlatform/DataflowJavaSDK/issues/50
> There are a variety of use cases which would benefit from native support for
> conditional iteration.
> For instance,
> http://stackoverflow.com/questions/31654421/conditional-iterations-in-google-cloud-dataflow/31659923?noredirect=1#comment51264604_31659923
> asks about being able to write a loop like the following:
> {code}
> PCollection data = ...
> while(needsMoreWork(data)) {
> data = doAStep(data)
> }
> {code}
> If there are specific use cases please let us know the details. In the future
> we will use this issue to post progress updates.
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