Jiayi Liao commented on FLINK-16645:

[~zjwang] Okay. I think this option should only work in 
{{ChannelSelectorRecordWriter}}, right?  

> Limit the maximum backlogs in subpartitions for data skew case
> --------------------------------------------------------------
>                 Key: FLINK-16645
>                 URL: https://issues.apache.org/jira/browse/FLINK-16645
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Runtime / Network
>            Reporter: Zhijiang
>            Priority: Major
>             Fix For: 1.11.0
> In the case of data skew, most of the buffers in partition's LocalBufferPool 
> are probably requested away and accumulated in certain subpartition, which 
> would increase in-flight data to slow down the barrier alignment.
> We can set up a proper config to control how many backlogs are allowed for 
> one subpartition. If one subpartition reaches this threshold, it will make 
> the buffer pool unavailable which blocks task processing continuously. Then 
> we can reduce the in-flight data for speeding up checkpoint process a bit and 
> not impact on the performance.

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