initial version

findActiveNameNode.sh

@@ -0,0 +1,58 @@
+#!/bin/bash
+#set -x
+#Author: Devopam, EXILANT Technologies Private Limited (www.exilant.com)
+#Returns the active namenode FQDN via stdout
+#Exit status non-zero for any un/handled errors. Suppress error messages if not desired
+#Script replaces default http port to 8020 in the FQDN for direct consumption by Talend ETL job. Feel free to comment the next line if not desired
+portName=":8020"
+
+#check if script can execute hdfs commands
+if [ ! -z "$HADOOP_HOME" ]; then
+    set PATH=$PATH:$HADOOP_HOME/bin
+fi
+
+isBinaryAccessible=`which hdfs > /dev/null 2>&1`
+status=$?
+
+if [ $status -ne 0 ]; then
+    echo "Could not locate hdfs executable. Please set HADOOP_HOME properly or add hdfs binary in your default PATH"
+    exit 1
+fi        
+
+adminuser=`hdfs getconf -confKey dfs.cluster.administrators`
+if [ $? -ne 0 ]; then   
+    echo "User $USER doesn't have execute permission as hdfs admin OR cluster is not accessible from this host"
+    exit 1
+fi
+
+#Uncomment the following block if you wish to get the commands executed only via administrators defined in hive-site.xml
+#if [ `whoami` != $adminuser ]; then
+#    echo "Please execute as user $adminuser"
+#    exit 1
+#fi
+
+haClusterName=`hdfs getconf -confKey dfs.nameservices`
+
+if [ $? -ne 0 -o -z "$haClusterName" ]; then
+    echo "Unable to fetch HA ClusterName"
+    exit 1
+fi
+
+nameNodeIdString=`hdfs getconf -confKey dfs.ha.namenodes.$haClusterName`
+
+
+for nameNodeId in `echo $nameNodeIdString | tr "," " "`
+do
+    status=`hdfs haadmin -getServiceState $nameNodeId`
+    if [ $status = "active" ]; then 
+        nameNode=`hdfs getconf -confKey dfs.namenode.https-address.$haClusterName.$nameNodeId`
+        if [ -z "$portName" ] ; then
+            echo $nameNode
+            exit 0;
+        else
+            echo `echo $nameNode|cut -d":" -f1`$portName
+            exit 0;
+        fi
+    fi
+done
+