[jira] [Created] (FLINK-10727) Remove unnecessary synchronization in SingleInputGate#requestPartitions()

["Nico Kruber (JIRA)" <ji...@apache.org>]

Nico Kruber created FLINK-10727:
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             Summary: Remove unnecessary synchronization in SingleInputGate#requestPartitions()
                 Key: FLINK-10727
                 URL: https://issues.apache.org/jira/browse/FLINK-10727
             Project: Flink
          Issue Type: Improvement
          Components: Network
    Affects Versions: 1.6.2, 1.5.5, 1.7.0
            Reporter: Nico Kruber
            Assignee: Nico Kruber


For every {{SingleInputGate#getNextBufferOrEvent()}}, {{SingleInputGate#requestPartitions()}} is called and this always synchronizes on the {{requestLock}} before checking the {{requestedPartitionsFlag}}. Since {{SingleInputGate#requestPartitions()}} is only called from the same thread (the task thread getting the record), it is enough to check the {{requestedPartitionsFlag}} first before synchronizing for the actual requests (if needed). {{UnionInputGate}} already goes the same way in its {{requestPartitions()}} implementation.



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