LAM-49 refactored init scripts to show the same response on status switch.

ansible/roles/apache-flink/templates/flink-init.j2

@@ -6,9 +6,6 @@ source /etc/environment
 # The path where Apache Flink is installed.
 INSTALLATION_PATH="{{ installation_path }}"
 
-# The full path of the pid file to use.
-PIDFILE="$INSTALLATION_PATH/flink/flink.pid"
-
 # The full path of the lock file to use.
 LOCKFILE="$INSTALLATION_PATH/flink/flink-lock"
 
@@ -19,11 +16,8 @@ START_COMMAND="$INSTALLATION_PATH/flink/bin/yarn-session.sh -n {{ number_of_task
 # before Flink's deployment.
 STOP_COMMAND="$HADOOP_HOME/bin/yarn application --kill"
 
-# The command that will return the status of Apache Flink.
-STATUS_COMMAND="$HADOOP_HOME/bin/yarn application -status"
-
 start(){
-  nohup $START_COMMAND &
+  nohup $START_COMMAND > /dev/null &
   RETVAL=$?
   [ $RETVAL -eq 0 ] && touch $LOCKFILE
   return $RETVAL
@@ -31,7 +25,7 @@ start(){
 
 stop(){
   id=$($HADOOP_HOME/bin/yarn application --list | grep "Flink session" | cut -f1)
-  nohup $STOP_COMMAND $id &
+  nohup $STOP_COMMAND $id > /dev/null &
   RETVAL=$?
   [ $RETVAL -eq 0 ] && $(rm -f $LOCKFILE)
   return $RETVAL
@@ -58,8 +52,7 @@ case "$1" in
     [ -f $LOCKFILE ] && restart || :
     ;;
   status)
-    id=$($HADOOP_HOME/bin/yarn application --list | grep "Flink session" | cut -f1)
-    $STATUS_COMMAND $id
+    [ -f $LOCKFILE ] && echo "Apache Flink is running." || echo "Apache Flink is not running."
     RETVAL=$?
     ;;
   *)

ansible/roles/apache-hadoop/templates/hdfs-init.j2

@@ -15,18 +15,15 @@ START_COMMAND="$INSTALLATION_PATH/hadoop/sbin/start-dfs.sh"
 # The command that will stop Apache HDFS.
 STOP_COMMAND="$INSTALLATION_PATH/hadoop/sbin/stop-dfs.sh"
 
-# The command that will return the status of Apache HDFS.
-STATUS_COMMAND="$INSTALLATION_PATH/hadoop/bin/hdfs dfsadmin -report"
-
 start(){
-  nohup $START_COMMAND &
+  nohup $START_COMMAND > /dev/null &
   RETVAL=$?
   [ $RETVAL -eq 0 ] && touch $LOCKFILE
   return $RETVAL
 }
 
 stop(){
-  nohup $STOP_COMMAND &
+  nohup $STOP_COMMAND > /dev/null &
   RETVAL=$?
   [ $RETVAL -eq 0 ] && $(rm -f $LOCKFILE)
   return $RETVAL
@@ -53,7 +50,7 @@ case "$1" in
     [ -f $LOCKFILE ] && restart || :
     ;;
   status)
-    $STATUS_COMMAND
+    [ -f $LOCKFILE ] && echo "Apache HDFS is running." || echo "Apache HDFS is not running."
     RETVAL=$?
     ;;
   *)

ansible/roles/apache-hadoop/templates/yarn-init.j2

@@ -16,14 +16,14 @@ START_COMMAND="$INSTALLATION_PATH/hadoop/sbin/start-yarn.sh"
 STOP_COMMAND="$INSTALLATION_PATH/hadoop/sbin/stop-yarn.sh"
 
 start(){
-  nohup $START_COMMAND &
+  nohup $START_COMMAND > /dev/null &
   RETVAL=$?
   [ $RETVAL -eq 0 ] && touch $LOCKFILE
   return $RETVAL
 }
 
 stop(){
-  nohup $STOP_COMMAND &
+  nohup $STOP_COMMAND > /dev/null &
   RETVAL=$?
   [ $RETVAL -eq 0 ] && $(rm -f $LOCKFILE)
   return $RETVAL
@@ -50,7 +50,7 @@ case "$1" in
     [ -f $LOCKFILE ] && restart || :
     ;;
   status)
-    [ -f $LOCKFILE ] && echo "Hadoop Yarn is running." || echo "Hadoop Yarn is not running."
+    [ -f $LOCKFILE ] && echo "Apache Yarn is running." || echo "Apache Yarn is not running."
     RETVAL=$?
     ;;
   *)

ansible/roles/apache-kafka/templates/kafka-init.j2

@@ -14,7 +14,7 @@ START_COMMAND="$INSTALLATION_PATH/kafka/bin/kafka-server-start.sh $INSTALLATION_
 
 start(){
   touch $PIDFILE
-  nohup $START_COMMAND & echo $! > $PIDFILE
+  nohup $START_COMMAND > /dev/null & echo $! > $PIDFILE
   RETVAL=$?
   [ $RETVAL -eq 0 ] && touch $LOCKFILE
   return $RETVAL
@@ -48,7 +48,7 @@ case "$1" in
     [ -f $LOCKFILE ] && restart || :
     ;;
   status)
-    ps -p $(cat $PIDFILE)
+    [ -f $LOCKFILE ] && echo "Apache Kafka is running." || echo "Apache kafka is not running."
     RETVAL=$?
     ;;
   *)

ansible/roles/apache-kafka/templates/zookeeper-init.j2

@@ -14,7 +14,7 @@ START_COMMAND="$INSTALLATION_PATH/kafka/bin/zookeeper-server-start.sh $INSTALLAT
 
 start(){
   touch $PIDFILE
-  nohup $START_COMMAND & echo $! > $PIDFILE
+  nohup $START_COMMAND > /dev/null & echo $! > $PIDFILE
   RETVAL=$?
   [ $RETVAL -eq 0 ] && touch $LOCKFILE
   return $RETVAL
@@ -48,7 +48,7 @@ case "$1" in
     [ -f $LOCKFILE ] && restart || :
     ;;
   status)
-    ps -p $(cat $PIDFILE)
+    [ -f $LOCKFILE ] && echo "Apache Zookeeper is running." || echo "Apache Zookeeper is not running."
     RETVAL=$?
     ;;
   *)