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https://issues.apache.org/jira/browse/BEAM-3087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16341059#comment-16341059
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Aljoscha Krettek commented on BEAM-3087:
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There was one user that had a problem because of this but I didn't hear about
it recently, so I think it's ok to push it back.
> Extend lock scope in Flink UnboundedSourceWrapper
> -------------------------------------------------
>
> Key: BEAM-3087
> URL: https://issues.apache.org/jira/browse/BEAM-3087
> Project: Beam
> Issue Type: Bug
> Components: runner-flink
> Reporter: Aljoscha Krettek
> Priority: Critical
> Fix For: 2.3.0
>
>
> In {{UnboundedSourceWrapper}} the lock scope is not big enough: we
> synchronise in {{emitElement()}} but should instead synchronise inside the
> reader loop in {{run()}} because the {{Source}} interface does not allow
> concurrent calls.
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