[jira] [Created] (FLINK-11082) Increase backlog only if it is available for consumption

[Shang Yuanchun (Jira)]

zhijiang created FLINK-11082:
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             Summary: Increase backlog only if it is available for consumption
                 Key: FLINK-11082
                 URL: https://issues.apache.org/jira/browse/FLINK-11082
             Project: Flink
          Issue Type: Sub-task
          Components: Network
    Affects Versions: 1.8.0
            Reporter: zhijiang
            Assignee: zhijiang


The backlog should indicate how many buffers are available in subpartition for downstream's  consumption. The availability is considered from two factors. One is {{BufferConsumer}} finished, and the other is flush triggered.

In current implementation, when the {{BufferConsumer}} is added into the subpartition, then the backlog is increased as a result, but this {{BufferConsumer}} is not yet available for network transport.

Furthermore, the backlog would affect requesting floating buffers on downstream side. That means some floating buffers are fetched in advance but not be used for long time, so the floating buffers are not made use of efficiently.

We found this scenario extremely for rebalance selector on upstream side, so we want to change when to increase backlog by finishing {{BufferConsumer}} or flush triggered.



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