Arunan Sugunakumar created HTTPCORE-644:
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Summary: High CPU usage noticed for SSLIOSession.close() after JDK
upgrade
Key: HTTPCORE-644
URL: https://issues.apache.org/jira/browse/HTTPCORE-644
Project: HttpComponents HttpCore
Issue Type: Bug
Components: HttpCore, HttpCore NIO
Environment: Oracle JDK 1.8.0_261 (released in July 2020)
AdoptOpenJDK (build 11.0.8+10)
All versions after Oracle JDK 11.0.1
Reporter: Arunan Sugunakumar
Attachments: image-2020-08-03-13-02-35-195.png
We are using a *forked version (4.3.3)* of HttpCore NIO. We recently had an
issue because of JDK upgrade. When a HTTPS connection is closed from the server
side, the server CPU usage seems to be increasing and stays on forever. We
debugged and found out that after the HTTPS response is written back to the
client, the server tries to close the connection and the SSLIOSession. Prior to
JDK 8 261 versions (& Prior to Oracle JDK 11.0.2), after SSLIOSession closes
the outBound connection, the Handshake status is returned as NEED_UNWRAP. When
such status is returned, we set the new event Mask as Read EventMask. In the
new JDK versions it is returned as NOT_HANDSHAKING. In such cases, the
SSLSession is not getting closed properly, and the server is constantly trying
to close the connection with Write events which causes the CPU spike. We
debugged the JDK code, and we were able to find a commit[1], which might have
caused this behaviour. With this JDK commit, TransportContext Handshake status
is returned as NOT_HANDSHAKING even after closeOutbound() is called. (The issue
is reproducible for both TLSv1.2 and TLSv1.3)
(Code snippet from JDK 11 commit)
!image-2020-08-03-13-02-35-195.png!
*I am not sure, whether this issue is reproducible in the latest HttpCore
version*. But since this a JDK level change, it might affect all versions. We
observed the issue with the following JDK versions.
* Oracle JDK 1.8.0_261 (released in July 2020)
* AdoptOpenJDK (build 11.0.8+10)
* All versions after Oracle JDK 11.0.1
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