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https://issues.apache.org/jira/browse/AMBARI-14050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15025917#comment-15025917
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Hudson commented on AMBARI-14050:
---------------------------------
FAILURE: Integrated in Ambari-branch-2.1 #934 (See
[https://builds.apache.org/job/Ambari-branch-2.1/934/])
AMBARI-14050 - Produce a Warning When Jetty Pool Size Is Too Low And (jhurley:
[http://git-wip-us.apache.org/repos/asf?p=ambari.git&a=commit&h=043bbf9bf4df9dfc11ea707afa17349316959202])
*
ambari-server/src/test/java/org/apache/ambari/server/controller/AmbariServerTest.java
*
ambari-server/src/main/java/org/apache/ambari/server/controller/AmbariServer.java
> Produce a Warning When Jetty Pool Size Is Too Low And Increase It
> -----------------------------------------------------------------
>
> Key: AMBARI-14050
> URL: https://issues.apache.org/jira/browse/AMBARI-14050
> Project: Ambari
> Issue Type: Bug
> Components: ambari-server
> Affects Versions: 2.0.0
> Reporter: Jonathan Hurley
> Assignee: Jonathan Hurley
> Priority: Critical
> Fix For: 2.1.3
>
> Attachments: AMBARI-14050.patch
>
>
> Ambari's default Jetty thread pool is configured at 25 threads. When deployed
> on a machine that has 48 "processors", Jetty's calculation for determining
> how many "Acceptor" and "Selector" threads to create never takes into account
> the core pool size. As a result, we get:
> - 12 "Acceptor" threads (these answer binds to port 8080)
> - 12 "Selector" threads (these pick available threads to answer bindings)
> - 1 free thread (these are the threads available to do stuff with)
> Notice that there's only 1 free thread. This means that Jetty effectively
> makes Ambari a single-threaded web application on larger systems!
> The "fix" is to increase the thread count in the {{ambari.properties}},
> however nobody knows to do this since no warning is produced.
> I suggest:
> - Log a warning on server startup if we detect that the core pool size is
> less than 3/4 of the available processors on the system.
> - Automatically increase the core pool size to the min(100, double existing
> size) when the above is detected
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