merge MAPREDUCE-4123 from trunk. Remove the 'mapred groups' command, which is no longer supported. (Contributed by Devaraj K)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1393776 13f79535-47bb-0310-9956-ffa450edef68

hadoop-mapreduce-project/CHANGES.txt

@@ -4,6 +4,9 @@ Release 2.0.3-alpha - Unreleased
   
   INCOMPATIBLE CHANGES
 
+    MAPREDUCE-4123. Remove the 'mapred groups' command, which is no longer 
+    supported. (Devaraj K via sseth)
+
   NEW FEATURES
 
   IMPROVEMENTS

hadoop-mapreduce-project/bin/mapred

@@ -35,7 +35,6 @@ function print_usage(){
   echo "  queue                get information regarding JobQueues"
   echo "  classpath            prints the class path needed for running"
   echo "                       mapreduce subcommands"
-  echo "  groups               get the groups which users belong to"
   echo "  historyserver        run job history servers as a standalone daemon"
   echo "  distcp <srcurl> <desturl> copy file or directories recursively"
   echo "  archive -archiveName NAME -p <parent path> <src>* <dest> create a hadoop archive"
@@ -63,9 +62,6 @@ elif [ "$COMMAND" = "sampler" ] ; then
   HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
 elif [ "$COMMAND" = "classpath" ] ; then
   echo -n 
-elif [ "$COMMAND" = "groups" ] ; then
-  CLASS=org.apache.hadoop.mapred.tools.GetGroups
-  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
 elif [ "$COMMAND" = "historyserver" ] ; then
   CLASS=org.apache.hadoop.mapreduce.v2.hs.JobHistoryServer
   HADOOP_OPTS="$HADOOP_OPTS -Dmapred.jobsummary.logger=${HADOOP_JHS_LOGGER:-INFO,console} $HADOOP_JOB_HISTORYSERVER_OPTS"
@@ -74,7 +70,8 @@ elif [ "$COMMAND" = "historyserver" ] ; then
   fi
 elif [ "$COMMAND" = "mradmin" ] \
     || [ "$COMMAND" = "jobtracker" ] \
-    || [ "$COMMAND" = "tasktracker" ] ; then
+    || [ "$COMMAND" = "tasktracker" ] \
+    || [ "$COMMAND" = "groups" ] ; then
   echo "Sorry, the $COMMAND command is no longer supported."
   echo "You may find similar functionality with the \"yarn\" shell command."
   print_usage