Created on 10-28-2015 05:22 PM
Configuring a separate service RPC port can improve the responsiveness of the NameNode by allowing DataNode and client requests to be processed via separate RPC queues.
Adding a service RPC port to an HA cluster with automatic failover via ZKFCs requires a workaround step.
The steps to configure a service RPC port are as follows:
<property> <name>dfs.namenode.servicerpc-address.mycluster.nn1</name> <value>nn1.example.com:8040</value> </property> <property> <name>dfs.namenode.servicerpc-address.mycluster.nn2</name> <value>nn2.example.com:8040</value> </property>
2. Restart NameNodes.
3. Stop the ZKFC processes on both NameNodes
4. Run the following command to reset the ZKFC state in ZooKeeper
hdfs zkfc -formatZK
Without this step you will see the following exception after ZKFC restart.
java.lang.RuntimeException: Mismatched address stored in ZK for NameNode
5. Restart the ZKFCs.
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