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[SPARK-13776][WebUI]Limit the max number of acceptors and selectors for Jetty #11615

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[SPARK-13776][WebUI]Limit the max number of acceptors and selectors for Jetty #11615

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ea99768
Add spark.ui.threads to set the max number of the UI threads
zsxwing Mar 9, 2016
8422f6e
Consider the number of selector too
zsxwing Mar 11, 2016
e772aed
Remove 'setMinThreads'
zsxwing Mar 11, 2016
068887b
Revert an irrelevant change
zsxwing Mar 15, 2016
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12 changes: 11 additions & 1 deletion core/src/main/scala/org/apache/spark/ui/JettyUtils.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,7 @@ import scala.collection.mutable.ArrayBuffer
import scala.language.implicitConversions
import scala.xml.Node

import org.eclipse.jetty.server.{Connector, Request, Server}
import org.eclipse.jetty.server.{AbstractConnector, Connector, Request, Server}
import org.eclipse.jetty.server.handler._
import org.eclipse.jetty.server.nio.SelectChannelConnector
import org.eclipse.jetty.server.ssl.SslSelectChannelConnector
Expand Down Expand Up @@ -270,9 +270,19 @@ private[spark] object JettyUtils extends Logging {

gzipHandlers.foreach(collection.addHandler)
connectors.foreach(_.setHost(hostName))
// As each Acceptor will use one thread, the number of threads should at least be the number
// of acceptors plus 1. (See SPARK-13776)
var minThreads = 1
connectors.collect { case c: AbstractConnector => c }.foreach { c =>
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Nit: the Scala math class is math vs Math but I wouldn't change it just for that. I think this looks like the right kind of approach.

// Limit the max acceptor number to 8 so that we don't waste a lot of threads
c.setAcceptors(Math.min(c.getAcceptors, 8))
minThreads += c.getAcceptors
}
server.setConnectors(connectors.toArray)

val pool = new QueuedThreadPool
pool.setMaxThreads(Math.max(pool.getMaxThreads, minThreads))
pool.setMinThreads(Math.min(pool.getMinThreads, pool.getMaxThreads))
pool.setDaemon(true)
server.setThreadPool(pool)
val errorHandler = new ErrorHandler()
Expand Down