HDFS-12576. JournalNodes are getting started, even though dfs.namenode.shared.edits.dir is not configured. Contributed by Bharat Viswanadham.

hadoop-hdfs-project/hadoop-hdfs/src/main/bin/start-dfs.sh

@@ -146,7 +146,7 @@ fi
 
 JOURNAL_NODES=$("${HADOOP_HDFS_HOME}/bin/hdfs" getconf -journalNodes 2>&-)
 
-if [[ "{$JOURNAL_NODES-}" != $'\n' ]]; then
+if [[ "${#JOURNAL_NODES}" != 0 ]]; then
   echo "Starting journal nodes [${JOURNAL_NODES}]"
 
   hadoop_uservar_su hdfs journalnode "${HADOOP_HDFS_HOME}/bin/hdfs" \

hadoop-hdfs-project/hadoop-hdfs/src/main/bin/stop-dfs.sh

@@ -102,7 +102,7 @@ fi
 
 JOURNAL_NODES=$("${HADOOP_HDFS_HOME}/bin/hdfs" getconf -journalNodes 2>&-)
 
-if [[ "{$JOURNAL_NODES-}" != $'\n' ]]; then
+if [[ "${#JOURNAL_NODES}" != 0 ]]; then
   echo "Stopping journal nodes [${JOURNAL_NODES}]"
 
   hadoop_uservar_su hdfs journalnode "${HADOOP_HDFS_HOME}/bin/hdfs" \