[jira] [Closed] (FLINK-24469) Incorrect calcualtion of the buffer size in case of channel data skew

["Dawid Wysakowicz (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-24469?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dawid Wysakowicz closed FLINK-24469.
------------------------------------
    Fix Version/s: 1.14.1
                   1.15.0
       Resolution: Implemented

Implemented in:
* master
** 6343e371c1d293c3df27c07cd0a4f65076a930b8
* 1.14.1
** 60d2a9cb9f04600e96f46f3362a01d65bcd8934b

> Incorrect calcualtion of the buffer size in case of channel data skew
> ---------------------------------------------------------------------
>
>                 Key: FLINK-24469
>                 URL: https://issues.apache.org/jira/browse/FLINK-24469
>             Project: Flink
>          Issue Type: Bug
>          Components: Runtime / Checkpointing
>    Affects Versions: 1.14.0
>            Reporter: Anton Kalashnikov
>            Assignee: Anton Kalashnikov
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.15.0, 1.14.1
>
>
> If only a couple out of 100 input channels are active then there is a huge throughput drop is observed. I suppose it happens because of the line inside of SingleInputGate#getBuffersInUseCount:
> {noformat}
> Math.max(1, channel.getBuffersInUseCount());
> {noformat}
> Right now, I don't think that it makes sense to have min value as 1, perhaps zero buffer in use is also ok.



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