hadoop-common-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Erik Krogen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15311) HttpServer2 needs a way to configure the acceptor/selector count
Date Tue, 13 Mar 2018 21:41:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16397706#comment-16397706
] 

Erik Krogen commented on HADOOP-15311:
--------------------------------------

Thanks Chris!

> HttpServer2 needs a way to configure the acceptor/selector count
> ----------------------------------------------------------------
>
>                 Key: HADOOP-15311
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15311
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: common
>            Reporter: Erik Krogen
>            Assignee: Erik Krogen
>            Priority: Major
>             Fix For: 3.0.2
>
>         Attachments: HADOOP-15311.000.patch, HADOOP-15311.001.patch, HADOOP-15311.002.patch
>
>
> HttpServer2 starts up with some number of acceptors and selectors, but only allows for
the automatic configuration of these based off of the number of available cores:
> {code:title=org.eclipse.jetty.server.ServerConnector}
> selectors > 0 ? selectors : Math.max(1, Math.min(4, Runtime.getRuntime().availableProcessors()
/ 2)))
> {code}
> {code:title=org.eclipse.jetty.server.AbstractConnector}
>     if (acceptors < 0) {
>       acceptors = Math.max(1, Math.min(4, cores / 8));
>     }
> {code}
> A thread pool is started of size, at minimum, {{acceptors + selectors + 1}}, so in addition
to allowing for a higher tuning value under heavily loaded environments, adding configurability
for this enables tuning these values down in resource constrained environments such as a MiniDFSCluster.



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)

---------------------------------------------------------------------
To unsubscribe, e-mail: common-issues-unsubscribe@hadoop.apache.org
For additional commands, e-mail: common-issues-help@hadoop.apache.org


Mime
View raw message