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https://issues.apache.org/jira/browse/BEAM-344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17545975#comment-17545975
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Danny McCormick commented on BEAM-344:
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This isn't actually real, but this issue has been migrated to
https://github.com/apache/beam/issues/17882
> Merge, Split, Delay, and Reorder bundles in the DirectRunner
> ------------------------------------------------------------
>
> Key: BEAM-344
> URL: https://issues.apache.org/jira/browse/BEAM-344
> Project: Beam
> Issue Type: Improvement
> Components: runner-direct
> Reporter: Thomas Groh
> Priority: P3
>
> PCollections have no guarantees about the ordering of elements between steps
> Randomly reordering, splitting and merging bundles will break user pipelines
> which assume some order will be maintained between steps and within a bundle.
> This assumption is not correct, so should break in the Direct Runner.
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