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From bugzi...@apache.org
Subject [Bug 63223] New: org.apache.coyote.http2.Http2UpgradeHandler.pruneClosedStreams
Date Sun, 03 Mar 2019 09:30:59 GMT
https://bz.apache.org/bugzilla/show_bug.cgi?id=63223

            Bug ID: 63223
           Summary: org.apache.coyote.http2.Http2UpgradeHandler.pruneClose
                    dStreams
           Product: Tomcat 9
           Version: 9.0.14
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: blocker
          Priority: P2
         Component: Catalina
          Assignee: dev@tomcat.apache.org
          Reporter: udi@kantzuker.com
  Target Milestone: -----

We have a blocking potential bug occurring on our web server, 
Once in a while the server get into blocking state not accepting new
connections. 

The logs are showing the following errors every few milliseconds: 

19-Feb-2019 06:09:10.455 WARNING [https-openssl-apr-8443-exec-435]
org.apache.coyote.http2.Http2UpgradeHandler.pruneClosedStreams Connection
[3442] Failed to fully prune the connection because streams were active / used
in the priority tree. There are [7] too many streams
19-Feb-2019 06:09:10.455 WARNING [https-openssl-apr-8443-exec-435]
org.apache.coyote.http2.Http2UpgradeHandler.pruneClosedStreams Connection
[3442] Failed to fully prune the connection because streams were active / used
in the priority tree. There are [7] too many streams
19-Feb-2019 06:09:10.456 WARNING [https-openssl-apr-8443-exec-435]
org.apache.coyote.http2.Http2UpgradeHandler.pruneClosedStreams Connection
[3442] Failed to fully prune the connection because streams were active / used
in the priority tree. There are [7] too many streams
19-Feb-2019 06:09:10.457 WARNING [https-openssl-apr-8443-exec-435]
org.apache.coyote.http2.Http2UpgradeHandler.pruneClosedStreams Connection
[3442] Failed to fully prune the connection because streams were active / used
in the priority tree. There are [7] too many streams
19-Feb-2019 06:09:10.457 WARNING [https-openssl-apr-8443-exec-435]
org.apache.coyote.http2.Http2UpgradeHandler.pruneClosedStreams Connection
[3442] Failed to fully prune the connection because streams were active / used
in the priority tree. There are [7] too many streams


It may stuck in this state for a random of time in minutes, once it was stuck
like that for over an hour. when I restarted the server the errors disappeared.

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