Erik Krogen created HADOOP-15311:
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Summary: 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
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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