Github user guoxu1231 commented on a diff in the pull request: https://github.com/apache/spark/pull/10464#discussion_r48676000 --- Diff: streaming/src/main/scala/org/apache/spark/streaming/dstream/SocketInputDStream.scala --- @@ -52,46 +52,60 @@ class SocketReceiver[T: ClassTag]( storageLevel: StorageLevel ) extends Receiver[T](storageLevel) with Logging { + private var socket: Socket = _ + def onStart() { - // Start the thread that receives data over a connection - new Thread("Socket Receiver") { - setDaemon(true) - override def run() { receive() } - }.start() + + try { + logInfo(s"Connecting to $host:$port") + socket = new Socket(host, port) + logInfo(s"Connected to $host:$port") + + // Start the thread that receives data over a connection + new Thread("Socket Receiver") { + setDaemon(true) + override def run() { receive() } + }.start() + } catch { + case e: ConnectException => + restart(s"Error connecting to $host:$port", e) + case NonFatal(e) => --- End diff -- "This is now in the wrong place. It was correct where it was." Sorry, I didn't catch this comment. I thought you means the "new Thread" block so I moved the "new Thead" block outside the try/catch block, It will looks like cause NPE. could you give more information about which block is now in the wrong block?
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