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https://issues.apache.org/jira/browse/BEAM-5211?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Weise updated BEAM-5211:
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Attachment: jstack.log
> Flink Streaming ExecutableStage operator chain blocks grpc receiver threads
> ----------------------------------------------------------------------------
>
> Key: BEAM-5211
> URL: https://issues.apache.org/jira/browse/BEAM-5211
> Project: Beam
> Issue Type: Bug
> Components: runner-flink
> Affects Versions: 2.6.0
> Reporter: Thomas Weise
> Assignee: Thomas Weise
> Priority: Major
> Labels: portability
> Fix For: 2.7.0
>
> Attachments: jstack.log
>
>
> The operator attempts to emit results as they are received, within the grpc
> thread, while the subtask thread is waiting for bundle completion. This leads
> to blocking of grpc threads and eventually deadlock when multiple stages are
> within an operator chain. Observed with wordcount, see attached stacktrace.
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