[SPARK-6870][Yarn] Catch InterruptedException when yarn application state...

[SPARK-6870][Yarn] Catch InterruptedException when yarn application state monitor thread been interrupted

On PR #5305 we interrupt the monitor thread but forget to catch the InterruptedException, then in the log will print the stack info, so we need to catch it.

Author: linweizhong <linweizhong@huawei.com>

Closes #5479 from Sephiroth-Lin/SPARK-6870 and squashes the following commits:

f775f93 [linweizhong] Update, don't need to call Thread.currentThread() on monitor thread
0e2ef1f [linweizhong] Update
0d8958a [linweizhong] Update
3513fdb [linweizhong] Catch InterruptedException

yarn/src/main/scala/org/apache/spark/scheduler/cluster/YarnClientSchedulerBackend.scala

@@ -128,10 +128,13 @@ private[spark] class YarnClientSchedulerBackend(
     assert(client != null && appId != null, "Application has not been submitted yet!")
     val t = new Thread {
       override def run() {
-        val (state, _) = client.monitorApplication(appId, logApplicationReport = false)
-        logError(s"Yarn application has already exited with state $state!")
-        sc.stop()
-        Thread.currentThread().interrupt()
+        try {
+          val (state, _) = client.monitorApplication(appId, logApplicationReport = false)
+          logError(s"Yarn application has already exited with state $state!")
+          sc.stop()
+        } catch {
+          case e: InterruptedException => logInfo("Interrupting monitor thread")
+        }
       }
     }
     t.setName("Yarn application state monitor")