ASF GitHub Bot commented on FLINK-8523:

Github user zhijiangW commented on the issue:

    Yes, I think it can make better use of floating buffers.
    As last confirmation with Piotr, this PR will not be merged into 
release-1.5, because there were still some issues not confirmed before. So I 
pended this PR and did not update it temporarily.
    What do you think of this PR issue? I can continue on it if necessary.

> Stop assigning floating buffers for blocked input channels in exactly-once 
> mode
> -------------------------------------------------------------------------------
>                 Key: FLINK-8523
>                 URL: https://issues.apache.org/jira/browse/FLINK-8523
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Network
>    Affects Versions: 1.5.0, 1.6.0
>            Reporter: zhijiang
>            Assignee: zhijiang
>            Priority: Major
>              Labels: pull-request-available
> In exactly-once mode, the input channel is set blocked state when reading 
> barrier from it. And the blocked state will be released after barrier 
> alignment or cancelled.
> In credit-based network flow control, we should avoid assigning floating 
> buffers for blocked input channels because the buffers after barrier will not 
> be processed by operator until alignment.
> To do so, we can fully make use of floating buffers and speed up barrier 
> alignment in some extent.

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