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https://issues.apache.org/jira/browse/HDDS-15551?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sergey Soldatov updated HDDS-15551:
-----------------------------------
Status: Patch Available (was: Open)
> Stream reads should respect gRPC flow control backpressure
> ----------------------------------------------------------
>
> Key: HDDS-15551
> URL: https://issues.apache.org/jira/browse/HDDS-15551
> Project: Apache Ozone
> Issue Type: Bug
> Components: Ozone Client
> Affects Versions: 2.1.0
> Reporter: Sergey Soldatov
> Assignee: Sergey Soldatov
> Priority: Major
> Labels: pull-request-available
>
> When ClientCallStreamObserver.isReady() returns false, the HTTP/2 send window
> is exhausted. Calling onNext() immediately queues the request in the gRPC
> client buffer, where it is never delivered to the DataNode's handler until
> the window reopens, causing poll() to time out waiting for a response that
> cannot arrive. Additionally, the backpressure wait used
> ozone.client.read.timeout (default 30s) as its deadline, independent of and
> additive to the stream-read poll timeout (default 10s), yielding up to 40s
> total delay.
> Previously, the issue was hidden by closing the gRPC stream during the seek
> operation.
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