Piotr Nowojski closed FLINK-14516.
    Fix Version/s: 1.10.0
     Release Note: Non credit-based network flow control code was removed 
alongside of the configuration option {{ taskmanager.network.credit-model }}. 
It's default value {{true}} is now the only option in Flink.
       Resolution: Fixed

Merged to master as 2dc0e3a3663f6c09ad726dfacad53760c47e15a0^ and 

> Remove non credit based network code
> ------------------------------------
>                 Key: FLINK-14516
>                 URL: https://issues.apache.org/jira/browse/FLINK-14516
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Runtime / Network
>    Affects Versions: 1.9.0
>            Reporter: Piotr Nowojski
>            Assignee: Piotr Nowojski
>            Priority: Critical
>              Labels: pull-request-available
>             Fix For: 1.10.0
>          Time Spent: 20m
>  Remaining Estimate: 0h
> After [a survey on the dev mailing 
> list|http://apache-flink-mailing-list-archive.1008284.n3.nabble.com/SURVEY-Dropping-non-Credit-based-Flow-Control-td33714.html]
>  the feedback was that old code path is not used and no longer needed. Based 
> on that we should be safe to drop it and make credit based flow control the 
> only option (currently it's the default).

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