HBASE-4243 HADOOP_HOME should be auto-detected

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1166761 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -459,6 +459,7 @@ Release 0.91.0 - Unreleased
    HBASE-4342  Update Thrift to 0.7.0 (Moaz Reyad)
    HBASE-4260  Expose a command to manually trigger an HLog roll
                (ramkrishna.s.vasudevan)
+   HBASE-4243  HADOOP_HOME should be auto-detected (Roman Shaposhnik)
 
   TASKS
    HBASE-3559  Move report of split to master OFF the heartbeat channel

bin/hbase

@@ -205,6 +205,14 @@ function append_path() {
 
 JAVA_PLATFORM=""
 
+#Try to guess HADOOP_HOME 
+if [ -z "$HADOOP_HOME" ]; then
+  HADOOP_IN_PATH=$(readlink -f "$(which hadoop 2>/dev/null)")
+  if [ -f "${HADOOP_IN_PATH}" ]; then
+    HADOOP_HOME=$(readlink -f "$(dirname  ${HADOOP_IN_PATH})"/..)
+  fi
+fi
+
 #If avail, add Hadoop to the CLASSPATH and to the JAVA_LIBRARY_PATH
 if [ ! -z $HADOOP_HOME ]; then
   HADOOPCPPATH=""