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[SPARK-21176] [Web UI] Limit number of selector threads for admin ui proxy servlets to 8 #18437

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IngoSchuster wants to merge 4 commits into from
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[SPARK-21176] [Web UI] Limit number of selector threads for admin ui proxy servlets to 8 #18437

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2d7d4f1
SPARK-21176: Limit number of selector threads for ProxyServlet to 8
IngoSchuster Jun 23, 2017
7cc808b
Update JettyUtils.scala
IngoSchuster Jun 28, 2017
1e17a20
Update JettyUtils.scala
IngoSchuster Jun 29, 2017
c6198d2
Update JettyUtils.scala
IngoSchuster Jun 29, 2017
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12 changes: 12 additions & 0 deletions core/src/main/scala/org/apache/spark/ui/JettyUtils.scala
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Expand Up @@ -26,6 +26,8 @@ import scala.language.implicitConversions
import scala.xml.Node

import org.eclipse.jetty.client.api.Response
import org.eclipse.jetty.client.HttpClient
import org.eclipse.jetty.client.http.HttpClientTransportOverHTTP
import org.eclipse.jetty.proxy.ProxyServlet
import org.eclipse.jetty.server._
import org.eclipse.jetty.server.handler._
Expand Down Expand Up @@ -208,6 +210,16 @@ private[spark] object JettyUtils extends Logging {
rewrittenURI.toString()
}

override def newHttpClient(): HttpClient = {
// SPARK-21176: Use the Jetty logic to calculate the number of selector threads (#CPUs/2),
// but limit it to 8 max.
// Otherwise, it might happen that we exhaust the threadpool since in reverse proxy mode
// a proxy is instantiated for each executor. If the head node has many processors, this
// can quickly add up to an unreasonably high number of threads.
val numSelectors = math.max(1, math.min(8, Runtime.getRuntime().availableProcessors() / 2))
new HttpClient(new HttpClientTransportOverHTTP(numSelectors), null)
}

override def filterServerResponseHeader(
clientRequest: HttpServletRequest,
serverResponse: Response,
Expand Down