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https://issues.apache.org/jira/browse/HTTPCORE-644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17170527#comment-17170527
]
Arunan Sugunakumar commented on HTTPCORE-644:
---------------------------------------------
Hi [~olegk],
I upgraded the Httpcore version to 4.4.11 in Apache Synapse[1] and invoked an
API with HTTPS. I tried this with Oracle JDK 1.8.0_261 and still I could see
that the issue is getting reproduced. For every request, the CPU usage is
increasing. This behaviour is not observed in older JDK 8 versions.
CPU load observed from JProfiler. (CPU keeps on spinning)
!Screenshot 2020-08-04 at 08.53.58.png|width=539,height=155!
I took a thread dump and observed that it is continuously trying to process a
writable event.
!Screenshot 2020-08-04 at 08.48.18.png|width=715,height=249!
I captured the TCP packets for reference as well. (50269 is the client, 8243 is
the server)
!Screenshot 2020-08-04 at 08.57.47.png|width=854,height=366!
I still believe this issue is due to the commit[2] I mentioned in the
description above. We tried removing the commit and patched AdoptOpenJDK11, and
this issue was not observed. It seems JDK has made a breaking change which
affects Httpcore.
[1]- [https://github.com/apache/synapse][
[2] -
https://github.com/AdoptOpenJDK/openjdk-jdk11u/commit/8d1b63a4db2c6348a97b3cf45bd4d2caa7cad6b5|https://github.com/apache/synapse]
Regards,
Arunan
> 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
> Priority: Major
> Attachments: Screenshot 2020-08-04 at 08.48.18.png, Screenshot
> 2020-08-04 at 08.53.58.png, Screenshot 2020-08-04 at 08.57.47.png,
> 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
>
> Any help here is appreciated.
>
> [1]-
> [https://github.com/AdoptOpenJDK/openjdk-jdk11u/commit/8d1b63a4db2c6348a97b3cf45bd4d2caa7cad6b5]
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