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https://issues.apache.org/jira/browse/DRILL-5994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16384236#comment-16384236
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ASF GitHub Bot commented on DRILL-5994:
---------------------------------------

GitHub user vrozov opened a pull request:

    https://github.com/apache/drill/pull/1148

    DRILL-5994: enable configuring number of Jetty acceptors and selectors 
(default to 1 acceptor and 2 selectors)

    @arina-ielchiieva @ilooner @MitchelLabonte Please review

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/vrozov/drill DRILL-5994

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/drill/pull/1148.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #1148
    
----
commit d4feca33e71218905ac5ea1aad55c0b77af2c305
Author: Vlad Rozov <vrozov@...>
Date:   2018-03-02T18:39:31Z

    DRILL-5994: enable configuring number of Jetty acceptors and selectors 
(default to 1 acceptor and 2 selectors)

----


> Cannot start web server on a machine with more than 200 cores
> -------------------------------------------------------------
>
>                 Key: DRILL-5994
>                 URL: https://issues.apache.org/jira/browse/DRILL-5994
>             Project: Apache Drill
>          Issue Type: Improvement
>    Affects Versions: 1.11.0
>            Reporter: Mitchel Labonte
>            Assignee: Mitchel Labonte
>            Priority: Minor
>              Labels: doc-impacting, ready-to-commit
>             Fix For: 1.13.0
>
>
> If the WebServer is launched on a machine that has more than 200 cores, you 
> get the following stack trace:
> {noformat}
> Exception in thread "main" 
> org.apache.drill.exec.exception.DrillStartupException: Failure during initial 
> startup of Drillbit:
> at org.apache.drill.exec.server.Drillbit.start(Drillbit.java:313)
> at org.apache.drill.exec.server.Drillbit.start(Drillbit.java:289)
> at org.apache.drill.exec.server.Drillbit.start(Drillbit.java:285)
> Caused by: java.lang.IllegalStateException: Insufficient max threads in 
> ThreadPool: max=200 < needed=206
> at org.eclipse.jetty.server.Server.doStart(Server.java:321)
> at 
> org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
> at org.eclipse.drill.exec.server.rest.WebServer.start(WebServer.java:197)
> at org.eclipse.drill.exec.server.Drillbit.run(Drillbit.java:140)
> at org.eclipse.drill.exec.server.Drillbit.start(Drillbit.java:309)
> ... 2 more
> {noformat}
> The cause of this is that in the WebServer start method, a Server instance is 
> created with the default constructor, which initializes a QueuedThreadPool 
> with a default maxThreads value of 200, and there is no way to configure this 
> value.
> *For documentation*
> New config option - drill.exec.web_server.thread_pool_max.



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