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https://issues.apache.org/jira/browse/BEAM-1294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15962245#comment-15962245
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ASF GitHub Bot commented on BEAM-1294:
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Github user asfgit closed the pull request at:
https://github.com/apache/beam/pull/2033
> Long running UnboundedSource Readers
> ------------------------------------
>
> Key: BEAM-1294
> URL: https://issues.apache.org/jira/browse/BEAM-1294
> Project: Beam
> Issue Type: Improvement
> Components: runner-spark
> Reporter: Amit Sela
> Assignee: Aviem Zur
>
> When reading from an UnboundedSource, current implementation will cause each
> split to create a new Reader every micro-batch.
> As long as the overhead of creating a reader is relatively low, it's
> reasonable (though I'd still be happy to get rid of), but in cases where the
> creation overhead is large it becomes unreasonable forcing large batches.
> One way to solve this could be to create a pool of lazy-init readers to serve
> each executor, maybe via Broadcast variables.
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