Merge -c 1390218 from trunk to branch-2 to fix HADOOP-8794. Rename YARN_HOME to HADOOP_YARN_HOME. Contributed by Vinod K V.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1390222 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -51,6 +51,8 @@ Release 2.0.2-alpha - 2012-09-07
     HADOOP-8689. Make trash a server side configuration option. (eli)
 
     HADOOP-8710. Remove ability for users to easily run the trash emptire. (eli)
+    
+    HADOOP-8794. Rename YARN_HOME to HADOOP_YARN_HOME. (vinodkv via acmurthy)
 
   NEW FEATURES
  

hadoop-common-project/hadoop-common/src/main/bin/hadoop-config.sh

@@ -268,21 +268,21 @@ fi
 CLASSPATH=${CLASSPATH}:$HADOOP_HDFS_HOME/$HDFS_DIR'/*'
 
 # put yarn in classpath if present
-if [ "$YARN_HOME" = "" ]; then
+if [ "$HADOOP_YARN_HOME" = "" ]; then
   if [ -d "${HADOOP_PREFIX}/$YARN_DIR" ]; then
-    export YARN_HOME=$HADOOP_PREFIX
+    export HADOOP_YARN_HOME=$HADOOP_PREFIX
   fi
 fi
 
-if [ -d "$YARN_HOME/$YARN_DIR/webapps" ]; then
-  CLASSPATH=${CLASSPATH}:$YARN_HOME/$YARN_DIR
+if [ -d "$HADOOP_YARN_HOME/$YARN_DIR/webapps" ]; then
+  CLASSPATH=${CLASSPATH}:$HADOOP_YARN_HOME/$YARN_DIR
 fi
 
-if [ -d "$YARN_HOME/$YARN_LIB_JARS_DIR" ]; then
-  CLASSPATH=${CLASSPATH}:$YARN_HOME/$YARN_LIB_JARS_DIR'/*'
+if [ -d "$HADOOP_YARN_HOME/$YARN_LIB_JARS_DIR" ]; then
+  CLASSPATH=${CLASSPATH}:$HADOOP_YARN_HOME/$YARN_LIB_JARS_DIR'/*'
 fi
 
-CLASSPATH=${CLASSPATH}:$YARN_HOME/$YARN_DIR'/*'
+CLASSPATH=${CLASSPATH}:$HADOOP_YARN_HOME/$YARN_DIR'/*'
 
 # put mapred in classpath if present AND different from YARN
 if [ "$HADOOP_MAPRED_HOME" = "" ]; then
@@ -291,7 +291,7 @@ if [ "$HADOOP_MAPRED_HOME" = "" ]; then
   fi
 fi
 
-if [ "$HADOOP_MAPRED_HOME/$MAPRED_DIR" != "$YARN_HOME/$YARN_DIR" ] ; then
+if [ "$HADOOP_MAPRED_HOME/$MAPRED_DIR" != "$HADOOP_YARN_HOME/$YARN_DIR" ] ; then
   if [ -d "$HADOOP_MAPRED_HOME/$MAPRED_DIR/webapps" ]; then
     CLASSPATH=${CLASSPATH}:$HADOOP_MAPRED_HOME/$MAPRED_DIR
   fi

hadoop-common-project/hadoop-common/src/main/bin/start-all.sh

@@ -33,6 +33,6 @@ if [ -f "${HADOOP_HDFS_HOME}"/sbin/start-dfs.sh ]; then
 fi
 
 # start yarn daemons if yarn is present
-if [ -f "${YARN_HOME}"/sbin/start-yarn.sh ]; then
-  "${YARN_HOME}"/sbin/start-yarn.sh --config $HADOOP_CONF_DIR
+if [ -f "${HADOOP_YARN_HOME}"/sbin/start-yarn.sh ]; then
+  "${HADOOP_YARN_HOME}"/sbin/start-yarn.sh --config $HADOOP_CONF_DIR
 fi