[ https://issues.apache.org/jira/browse/BEAM-3087?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jean-Baptiste Onofré updated BEAM-3087:
---------------------------------------
    Fix Version/s:     (was: 2.3.0)
                   2.4.0

> 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: 2.4.0
>
>
> 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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