Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/14710#discussion_r76347979 --- Diff: core/src/main/scala/org/apache/spark/deploy/client/StandaloneAppClient.scala --- @@ -220,19 +225,13 @@ private[spark] class StandaloneAppClient( endpointRef: RpcEndpointRef, context: RpcCallContext, msg: T): Unit = { - // Create a thread to ask a message and reply with the result. Allow thread to be + // Ask a message and create a thread to reply with the result. Allow thread to be // interrupted during shutdown, otherwise context must be notified of NonFatal errors. - askAndReplyThreadPool.execute(new Runnable { - override def run(): Unit = { - try { - context.reply(endpointRef.askWithRetry[Boolean](msg)) - } catch { - case ie: InterruptedException => // Cancelled - case NonFatal(t) => - context.sendFailure(t) - } - } - }) + endpointRef.ask[Boolean](msg).andThen { + case Success(b) => context.reply(b) + case Failure(ie: InterruptedException) => // Cancelled + case Failure(NonFatal(t)) => context.sendFailure(t) + }(askAndReplyExecutionContext) --- End diff -- Do you need `askAndReplyExecutionContext` anymore? It seems now all the heavy lifting is being done in the RPC thread pool, and the `andThen` code could just use `ThreadUtils.sameThreadExecutionContext` since it doesn't do much.
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