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https://issues.apache.org/jira/browse/APEXCORE-510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15524014#comment-15524014
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Vlad Rozov commented on APEXCORE-510:
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What classes overwrite DefaultOutputPort.setup()?
> Enforce DefaultOutputPort.emit() or Sink.put() thread affinity
> --------------------------------------------------------------
>
> Key: APEXCORE-510
> URL: https://issues.apache.org/jira/browse/APEXCORE-510
> Project: Apache Apex Core
> Issue Type: Improvement
> Reporter: Vlad Rozov
>
> Apex platform assumes that an operator interacts with the platform using the
> dedicated operator thread. Currently, operators may create worker threads and
> emit tuples from a worker thread. This leads to undefined behavior and hard
> to find bugs, so it should be possible to enforce that
> DefaultOutputPort.emit() and/or Sink.put() are called on the operator thread.
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