Erik Krogen created HADOOP-15311:

             Summary: HttpServer2 needs a way to configure the 
acceptor/selector count
                 Key: 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:
selectors > 0 ? selectors : Math.max(1, Math.min(4, 
Runtime.getRuntime().availableProcessors() / 2)))
    if (acceptors < 0) {
      acceptors = Math.max(1, Math.min(4, cores / 8));
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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