[jira] [Created] (FLINK-21789) Make FileChannelManagerImpl#getNextPathNum select data directory fairly

[Shang Yuanchun (Jira)]

Yingjie Cao created FLINK-21789:
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             Summary: Make FileChannelManagerImpl#getNextPathNum select data directory fairly
                 Key: FLINK-21789
                 URL: https://issues.apache.org/jira/browse/FLINK-21789
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / Network
            Reporter: Yingjie Cao
             Fix For: 1.13.0


The get and increase next path index in FileChannelManagerImpl#getNextPathNum is not atomic which may cause unfairness of data directory selection (bad for performance if multiple disk is configured).



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