SPARK-1652: Remove incorrect deprecation warning in spark-submit

This is a straightforward fix.

Author: Patrick Wendell <pwendell@gmail.com>

This patch had conflicts when merged, resolved by
Committer: Patrick Wendell <pwendell@gmail.com>

Closes #578 from pwendell/spark-submit-yarn and squashes the following commits:

96027c7 [Patrick Wendell] Test fixes
b5be173 [Patrick Wendell] Review feedback
4ac9cac [Patrick Wendell] SPARK-1652: spark-submit for yarn prints warnings even though calling as expected

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

@@ -137,6 +137,9 @@ object SparkSubmit {
         throw new Exception(msg)
       }
     }
+    
+    // Special flag to avoid deprecation warnings at the client
+    sysProps("SPARK_SUBMIT") = "true"
 
     val options = List[OptionAssigner](
       new OptionAssigner(appArgs.master, ALL_CLUSTER_MGRS, false, sysProp = "spark.master"),

core/src/test/scala/org/apache/spark/deploy/SparkSubmitSuite.scala

@@ -122,7 +122,7 @@ class SparkSubmitSuite extends FunSuite with ShouldMatchers {
     childArgsStr should include ("--num-executors 6")
     mainClass should be ("org.apache.spark.deploy.yarn.Client")
     classpath should have length (0)
-    sysProps should have size (0)
+    sysProps should have size (1)
   }
 
   test("handles YARN client mode") {
@@ -146,6 +146,7 @@ class SparkSubmitSuite extends FunSuite with ShouldMatchers {
     sysProps("spark.yarn.dist.files") should be ("file1.txt,file2.txt")
     sysProps("spark.yarn.dist.archives") should be ("archive1.txt,archive2.txt")
     sysProps("spark.executor.instances") should be ("6")
+    sysProps("SPARK_SUBMIT") should be ("true")
   }
 
   test("handles standalone cluster mode") {
@@ -159,7 +160,7 @@ class SparkSubmitSuite extends FunSuite with ShouldMatchers {
     childArgsStr should include ("launch spark://h:p thejar.jar org.SomeClass arg1 arg2")
     mainClass should be ("org.apache.spark.deploy.Client")
     classpath should have length (0)
-    sysProps should have size (1) // contains --jar entry
+    sysProps should have size (2) // contains --jar entry and SPARK_SUBMIT
   }
 
   test("handles standalone client mode") {

yarn/alpha/src/main/scala/org/apache/spark/deploy/yarn/Client.scala

@@ -169,8 +169,10 @@ class Client(clientArgs: ClientArguments, hadoopConf: Configuration, spConf: Spa
 object Client {
 
   def main(argStrings: Array[String]) {
-    println("WARNING: This client is deprecated and will be removed in a future version of Spark.")
-    println("Use ./bin/spark-submit with \"--master yarn\"")
+    if (!sys.props.contains("SPARK_SUBMIT")) {
+      println("WARNING: This client is deprecated and will be removed in a " +
+        "future version of Spark. Use ./bin/spark-submit with \"--master yarn\"")
+    }
 
     // Set an env variable indicating we are running in YARN mode.
     // Note that anything with SPARK prefix gets propagated to all (remote) processes

yarn/stable/src/main/scala/org/apache/spark/deploy/yarn/Client.scala

@@ -171,8 +171,10 @@ class Client(clientArgs: ClientArguments, hadoopConf: Configuration, spConf: Spa
 object Client {
 
   def main(argStrings: Array[String]) {
-    println("WARNING: This client is deprecated and will be removed in a future version of Spark.")
-    println("Use ./bin/spark-submit with \"--master yarn\"")
+    if (!sys.props.contains("SPARK_SUBMIT")) {
+      println("WARNING: This client is deprecated and will be removed in a " +
+        "future version of Spark. Use ./bin/spark-submit with \"--master yarn\"")
+    }
 
     // Set an env variable indicating we are running in YARN mode.
     // Note: anything env variable with SPARK_ prefix gets propagated to all (remote) processes -