[SPARK-5732][CORE]:Add an option to print the spark version in spark …

…script.

Naturally, we may need to add an option to print the spark version in spark script. It is pretty common in script tool.
![9](https://cloud.githubusercontent.com/assets/7402327/6183331/cab1b74e-b38e-11e4-9daa-e26e6015cff3.JPG)

Author: uncleGen <hustyugm@gmail.com>
Author: genmao.ygm <genmao.ygm@alibaba-inc.com>

Closes #4522 from uncleGen/master-clean-150211 and squashes the following commits:

9f2127c [genmao.ygm] revert the behavior of "-v"
015ddee [uncleGen] minor changes
463f02c [uncleGen] minor changes

(cherry picked from commit c0ccd25)
Signed-off-by: Andrew Or <andrew@databricks.com>

core/src/main/scala/org/apache/spark/deploy/SparkSubmit.scala

@@ -37,6 +37,7 @@ import org.apache.ivy.core.settings.IvySettings
 import org.apache.ivy.plugins.matcher.GlobPatternMatcher
 import org.apache.ivy.plugins.resolver.{ChainResolver, IBiblioResolver}
 
+import org.apache.spark.SPARK_VERSION
 import org.apache.spark.deploy.rest._
 import org.apache.spark.executor._
 import org.apache.spark.util.{ChildFirstURLClassLoader, MutableURLClassLoader, Utils}
@@ -83,14 +84,25 @@ object SparkSubmit {
   // Exposed for testing
   private[spark] var exitFn: () => Unit = () => System.exit(1)
   private[spark] var printStream: PrintStream = System.err
-  private[spark] def printWarning(str: String) = printStream.println("Warning: " + str)
-  private[spark] def printErrorAndExit(str: String) = {
+  private[spark] def printWarning(str: String): Unit = printStream.println("Warning: " + str)
+  private[spark] def printErrorAndExit(str: String): Unit = {
     printStream.println("Error: " + str)
     printStream.println("Run with --help for usage help or --verbose for debug output")
     exitFn()
   }
+  private[spark] def printVersionAndExit(): Unit = {
+    printStream.println("""Welcome to
+      ____              __
+     / __/__  ___ _____/ /__
+    _\ \/ _ \/ _ `/ __/  '_/
+   /___/ .__/\_,_/_/ /_/\_\   version %s
+      /_/
+                        """.format(SPARK_VERSION))
+    printStream.println("Type --help for more information.")
+    exitFn()
+  }
 
-  def main(args: Array[String]) {
+  def main(args: Array[String]): Unit = {
     val appArgs = new SparkSubmitArguments(args)
     if (appArgs.verbose) {
       printStream.println(appArgs)

core/src/main/scala/org/apache/spark/deploy/SparkSubmitArguments.scala

@@ -417,6 +417,9 @@ private[spark] class SparkSubmitArguments(args: Seq[String], env: Map[String, St
         verbose = true
         parse(tail)
 
+      case ("--version") :: tail =>
+        SparkSubmit.printVersionAndExit()
+
       case EQ_SEPARATED_OPT(opt, value) :: tail =>
         parse(opt :: value :: tail)
 
@@ -485,6 +488,7 @@ private[spark] class SparkSubmitArguments(args: Seq[String], env: Map[String, St
         |
         |  --help, -h                  Show this help message and exit
         |  --verbose, -v               Print additional debug output
+        |  --version,                  Print the version of current Spark
         |
         | Spark standalone with cluster deploy mode only:
         |  --driver-cores NUM          Cores for driver (Default: 1).