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https://issues.apache.org/jira/browse/BEAM-8846?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17002445#comment-17002445
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Luke Cwik commented on BEAM-8846:
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The stream observers are meant to be thread safe already. All that needs to
change is updating the documentation.
> Force synchronization of the stream observer in BeamFnControlClient
> -------------------------------------------------------------------
>
> Key: BEAM-8846
> URL: https://issues.apache.org/jira/browse/BEAM-8846
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-harness
> Affects Versions: 2.18.0
> Reporter: sunjincheng
> Assignee: sunjincheng
> Priority: Major
> Time Spent: 2.5h
> Remaining Estimate: 0h
>
> Currently there is no synchronization to access the stream observer in
> BeamFnControlClient which is not thread safe. We should fix it.
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