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https://issues.apache.org/jira/browse/BEAM-1438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15859960#comment-15859960
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Kenneth Knowles commented on BEAM-1438:
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Assigning because it looks like you have this well underway.
> The default behavior for the Write transform doesn't work well with the
> Dataflow streaming runner
> -------------------------------------------------------------------------------------------------
>
> Key: BEAM-1438
> URL: https://issues.apache.org/jira/browse/BEAM-1438
> Project: Beam
> Issue Type: Bug
> Components: runner-dataflow
> Reporter: Reuven Lax
> Assignee: Reuven Lax
>
> If a Write specifies 0 output shards, that implies the runner should pick an
> appropriate sharding. The default behavior is to write one shard per input
> bundle. This works well with the Dataflow batch runner, but not with the
> streaming runner which produces large numbers of small bundles.
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