[SPARK-25174][YARN] Limit the size of diagnostic message for am to unregister itself from rm

## What changes were proposed in this pull request?

When using older versions of spark releases,  a use case generated a huge code-gen file which hit the limitation `Constant pool has grown past JVM limit of 0xFFFF`.  In this situation, it should fail immediately. But the diagnosis message sent to RM is too large,  the ApplicationMaster suspended and RM's ZKStateStore was crashed. For 2.3 or later spark releases the limitation of code-gen has been removed, but maybe there are still some uncaught exceptions that contain oversized error message will cause such a problem.

This PR is aim to cut down the diagnosis message size.

## How was this patch tested?

Please review http://spark.apache.org/contributing.html before opening a pull request.

Closes #22180 from yaooqinn/SPARK-25174.

Authored-by: Kent Yao <[email protected]>
Signed-off-by: Marcelo Vanzin <[email protected]>

Author: yaooqinn

resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMaster.scala

@@ -19,7 +19,7 @@ package org.apache.spark.deploy.yarn
 
 import java.io.{File, IOException}
 import java.lang.reflect.{InvocationTargetException, Modifier}
-import java.net.{Socket, URI, URL}
+import java.net.{URI, URL}
 import java.security.PrivilegedExceptionAction
 import java.util.concurrent.{TimeoutException, TimeUnit}
 
@@ -28,6 +28,7 @@ import scala.concurrent.Promise
 import scala.concurrent.duration.Duration
 import scala.util.control.NonFatal
 
+import org.apache.commons.lang3.{StringUtils => ComStrUtils}
 import org.apache.hadoop.fs.{FileSystem, Path}
 import org.apache.hadoop.util.StringUtils
 import org.apache.hadoop.yarn.api._
@@ -368,7 +369,7 @@ private[spark] class ApplicationMaster(args: ApplicationMasterArguments) extends
         }
         logInfo(s"Final app status: $finalStatus, exitCode: $exitCode" +
           Option(msg).map(msg => s", (reason: $msg)").getOrElse(""))
-        finalMsg = msg
+        finalMsg = ComStrUtils.abbreviate(msg, sparkConf.get(AM_FINAL_MSG_LIMIT).toInt)
         finished = true
         if (!inShutdown && Thread.currentThread() != reporterThread && reporterThread != null) {
           logDebug("shutting down reporter thread")

resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/config.scala

@@ -192,6 +192,12 @@ package object config {
     .toSequence
     .createWithDefault(Nil)
 
+  private[spark] val AM_FINAL_MSG_LIMIT = ConfigBuilder("spark.yarn.am.finalMessageLimit")
+    .doc("The limit size of final diagnostic message for our ApplicationMaster to unregister from" +
+      " the ResourceManager.")
+    .bytesConf(ByteUnit.BYTE)
+    .createWithDefaultString("1m")
+
   /* Client-mode AM configuration. */
 
   private[spark] val AM_CORES = ConfigBuilder("spark.yarn.am.cores")