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https://issues.apache.org/jira/browse/FLINK-9014?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Piotr Nowojski closed FLINK-9014.
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Resolution: Not A Problem
Assignee: Piotr Nowojski
This wasn't an issue. Senders with credit based flow control in case of back
pressure are also blocked on `requestBufferBuilderBlocking` as it is the case
for non credit base flow control.
Credit base flow controls works on one level deeper - in
netty/PartitionRequestQueue. Once Credit base flow control blocks a channel, it
prevents the netty from reading from blocked Subpartition. This means that
writers to this subpartition will be eventually blocked on waiting for buffers
(`requestBufferBuilderBlocking`).
> Adapt BackPressureStatsTracker to work with credit-based flow control
> ---------------------------------------------------------------------
>
> Key: FLINK-9014
> URL: https://issues.apache.org/jira/browse/FLINK-9014
> Project: Flink
> Issue Type: Sub-task
> Components: Network, Webfrontend
> Affects Versions: 1.5.0
> Reporter: Nico Kruber
> Assignee: Piotr Nowojski
> Priority: Critical
> Fix For: 1.5.0
>
>
> The {{BackPressureStatsTracker}} relies on sampling threads being blocked in
> {{LocalBufferPool#requestBufferBuilderBlocking}} to indicate backpressure but
> with credit-based flow control, we are also back-pressured if we did not get
> any credits (yet).
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