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[SPARK-21159][core] Don't try to connect to launcher in standalone cluster mode. #18397

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[SPARK-21159][core] Don't try to connect to launcher in standalone cluster mode. #18397

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8 changes: 7 additions & 1 deletion core/src/main/scala/org/apache/spark/scheduler/cluster/StandaloneSchedulerBackend.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -58,7 +58,13 @@ private[spark] class StandaloneSchedulerBackend(

override def start() {
super.start()
launcherBackend.connect()

// SPARK-21159. The scheduler backend should only try to connect to the launcher when in client
// mode. In cluster mode, the code that submits the application to the Master needs to connect
// to the launcher instead.
if (sc.deployMode == "client") {
launcherBackend.connect()
}

// The endpoint for executors to talk to us
val driverUrl = RpcEndpointAddress(
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