update resource manager starting script

hadoop/nodemanager/run.sh

@@ -1,3 +1,21 @@
 #!/bin/bash
 
+check_namenode() {
+  safe_mode_status=$(hdfs dfsadmin -safemode get | grep 'Safe mode is OFF')
+  if [[ $safe_mode_status == *"Safe mode is OFF"* ]]; then
+    echo "NameNode is out of Safe Mode."
+    return 0
+  else
+    echo "NameNode is still in Safe Mode. Waiting..."
+    return 1
+  fi
+}
+
+# Wait for NameNode to leave Safe Mode
+until check_namenode; do
+  sleep 10
+done
+
+echo "Starting ResourceManager..."
+
 $HADOOP_HOME/bin/yarn --config $HADOOP_CONF_DIR nodemanager