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From "Thomas Groh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BEAM-344) Merge, Split, Delay, and Reorder bundles in the DirectRunner
Date Mon, 03 Apr 2017 18:06:41 GMT

    [ https://issues.apache.org/jira/browse/BEAM-344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15953925#comment-15953925
] 

Thomas Groh commented on BEAM-344:
----------------------------------

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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