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https://issues.apache.org/jira/browse/HADOOP-15311?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HADOOP-15311 started by Erik Krogen.
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> 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
>
> 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.
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