[Bug 65460] http2 request hang on request read

[bu...@apache.org]

https://bz.apache.org/bugzilla/show_bug.cgi?id=65460

Mark Thomas <ma...@apache.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|http2 request hang with     |http2 request hang on
                   |tomcat 9.0.50's overhead    |request read
                   |protection                  |

--- Comment #13 from Mark Thomas <ma...@apache.org> ---
I'm as sure as I can be this isn't overhead protection related.

The HTTP/2 streams are blocked, waiting to receive data. If the overhead
protection had been triggered, these streams would have been closed. The
exceptions in the logs are also consistent with request reads timing out.

What isn't yet clear is the root cause. Possibilities are:
1. The client isn't sending data. Unlikely given the issue started after the
move from 9.0.45 to 9.0.50.
2. The data is being received but the stream isn't being notified. Unlikely as
there have been no changes in this specific area.
3. Window updates are not being sent correctly. Seems the most likely candidate
at this point as there are changes for this in 9.0.49.

I was about to suggest a couple of things to try to collect more data. As part
of that I was checking exactly what debug logging is provided for Window
updates and I managed to recreate the issue.

I'm investigating now but setting overheadWindowUpdateThreshold="0" seems to
work around the issue.

-- 
You are receiving this mail because:
You are the assignee for the bug.
---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@tomcat.apache.org
For additional commands, e-mail: dev-help@tomcat.apache.org