Throw an exception if the working directory or mapred.system dir doesn't exist. bz1115113

Author: childsb

src/main/java/org/apache/hadoop/fs/glusterfs/GlusterVolume.java

@@ -136,15 +136,17 @@ public void setConf(Configuration conf){
                 }
 
                 if(sameVolume(mapredSysDirectory) && !exists(mapredSysDirectory) ){
-                    mkdirs(mapredSysDirectory);
+                 //   mkdirs(mapredSysDirectory);
+                    throw new RuntimeException("Error (mapred.system.dir/mapreduce.jobtracker.system.dir) does not exist: " + mapredSysDirectory);
                 }
                 //Working directory setup
 
                 Path workingDirectory = getInitialWorkingDirectory();
                 if(!sameVolume(workingDirectory)){
                     workingDirectory = new Path("/");
                 }else if( !exists(workingDirectory)){
-                    mkdirs(workingDirectory);
+                   // mkdirs(workingDirectory);
+                    throw new RuntimeException("Error working directory does not exist: " + workingDirectory);
                 }
                 setWorkingDirectory(workingDirectory);