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https://issues.apache.org/jira/browse/BEAM-344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15953925#comment-15953925
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Thomas Groh commented on BEAM-344:
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Splitting is done. Ordering is arbitrary but there is no explicit reordering.
Merging and delaying bundles gets relatively deep into the guts of the
DirectRunner, so I don't know how suitable this is for a starter bug.
> 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: Minor
>
> 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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