MAPREDUCE-6472. MapReduce AM should have java.io.tmpdir=./tmp to be consistent with tasks. Contributed by Naganarasimha G R

hadoop-mapreduce-project/CHANGES.txt

@@ -590,6 +590,9 @@ Release 2.7.2 - UNRELEASED
     MAPREDUCE-6474. ShuffleHandler can possibly exhaust nodemanager file
     descriptors (Kuhu Shukla via jlowe)
 
+    MAPREDUCE-6472. MapReduce AM should have java.io.tmpdir=./tmp to be
+    consistent with tasks (Naganarasimha G R via jlowe)
+
 Release 2.7.1 - 2015-07-06 
 
   INCOMPATIBLE CHANGES

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/main/java/org/apache/hadoop/mapred/YARNRunner.java

@@ -402,6 +402,10 @@ public class YARNRunner implements ClientProtocol {
     vargs.add(MRApps.crossPlatformifyMREnv(jobConf, Environment.JAVA_HOME)
         + "/bin/java");
 
+    Path amTmpDir =
+        new Path(MRApps.crossPlatformifyMREnv(conf, Environment.PWD),
+            YarnConfiguration.DEFAULT_CONTAINER_TEMP_DIR);
+    vargs.add("-Djava.io.tmpdir=" + amTmpDir);
     MRApps.addLog4jSystemProperties(null, vargs, conf);
 
     // Check for Java Lib Path usage in MAP and REDUCE configs

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/TestYARNRunner.java

@@ -461,7 +461,8 @@ public class TestYARNRunner extends TestCase {
     int adminPos = -1;
     int userIndex = 0;
     int userPos = -1;
-    
+    int tmpDirPos = -1;
+
     for(String command : commands) {
       if(command != null) {
         assertFalse("Profiler should be disabled by default",
@@ -473,11 +474,16 @@ public class TestYARNRunner extends TestCase {
         userPos = command.indexOf("-Xmx1024m");
         if(userPos >= 0)
           userIndex = index;
+
+        tmpDirPos = command.indexOf("-Djava.io.tmpdir=");
       }
       
       index++;
     }
-    
+
+    // Check java.io.tmpdir opts are set in the commands
+    assertTrue("java.io.tmpdir is not set for AM", tmpDirPos > 0);
+
     // Check both admin java opts and user java opts are in the commands
     assertTrue("AM admin command opts not in the commands.", adminPos > 0);
     assertTrue("AM user command opts not in the commands.", userPos > 0);