Integrated: 8357639: DigestEchoClient fails intermittently due to: java.io.IOException: Data received while in pool

[Daniel Fuchs]

On Fri, 23 May 2025 14:35:30 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

> The java/net/httpclient/DigestEchoClient.java fails intemittently with IOException: HTTP/1.1 header parser received no bytes.
> 
> Analysis shows that this is caused by the CleanupTrigger which receives data after the reused connection has been taken out of the HTTP/1.1 clear pool (Caused by: java.io.IOException: Data received while in pool). This should not happen.
> 
> The fix for [JDK-8338569](https://bugs.openjdk.org/browse/JDK-8338569) has improved the situation but apparently didn't fix the issue completely.
> The issue is that the write publisher manages to come active before the read subscriber has been switched, which opens a window in which the old read subscriber receives the data that should have been passed to the new one.
> 
> To fix that, this change  proposes to pause reading at the selector level before connecting the flows with the new publisher /subscriber pair. This should ensure that data doesn't reach the "old" subscriber, if the new write publisher manage to send data before the new read subscriber is subscribed.

This pull request has now been integrated.

Changeset: 0582bd29
Author:    Daniel Fuchs <dfuchs at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/0582bd290d5a8b6344ae7ada36492cc2f33df050
Stats:     67 lines in 1 file changed: 26 ins; 30 del; 11 mod

8357639: DigestEchoClient fails intermittently due to: java.io.IOException: Data received while in pool

Reviewed-by: djelinski

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PR: https://git.openjdk.org/jdk/pull/25416