Skip to main content
ArpitAgarwal
Gold ⭐️
ArpitAgarwal
Gold ⭐️
October 29, 2015

Adding a Service RPC Port to an Existing HA Cluster with ZKFCs

  • October 5, 2026 at 9:44 AM
  • 0 replies
  • 3471 views
  • Translate All

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:

  1. Add the following settings to hdfs-site.xml.

<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.

    Terms & ConditionsAccessibility statement