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https://issues.apache.org/jira/browse/FLINK-8520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16362144#comment-16362144
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Chesnay Schepler commented on FLINK-8520:
-----------------------------------------

There's a race condition between the callback decrementing the pending count 
and the sink checking&waiting on the count which can cause the sink to deadlock 
during snapshotState() and close(). Bumping this to Blocker.

> CassandraConnectorITCase.testCassandraTableSink unstable on Travis
> ------------------------------------------------------------------
>
>                 Key: FLINK-8520
>                 URL: https://issues.apache.org/jira/browse/FLINK-8520
>             Project: Flink
>          Issue Type: Bug
>          Components: Cassandra Connector, Table API & SQL, Tests
>    Affects Versions: 1.5.0
>            Reporter: Till Rohrmann
>            Assignee: Chesnay Schepler
>            Priority: Blocker
>              Labels: test-stability
>             Fix For: 1.5.0, 1.4.2
>
>
> The {{CassandraConnectorITCase.testCassandraTableSink}} fails on Travis with 
> a timeout.
>  
> https://travis-ci.org/tillrohrmann/flink/jobs/333711342



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