[HDFS-10391] Always enable NameNode service RPC port

• Type: Improvement
• Status: Reopened
• Priority: Major
• Resolution: Unresolved
• Component/s: datanode, namenode
• Labels: Incompatible
• Hadoop Flags: Incompatible change, Reviewed

Release Note

The NameNode service RPC port is enabled by default. This port is used by the NameNode to accept non-client requests i.e. requests from other HDFS services namely the DataNodes, ZooKeeper Failover Controllers and the Secondary NameNode. The default service RPC port is 9840. It can be changed via the configuration key dfs.namenode.servicerpc-address.

• Assignee: Gergely Novák
• Reporter: Arpit Agarwal
• Created: 11/May/16 23:47
• Updated: 14/Oct/19 15:37

Description

The NameNode should always be setup with a service RPC port so that it does not have to be explicitly enabled by an administrator.

Issue Links

• breaks: HDFS-12451 Datanodes don't start with this message: "Problem connecting to server: localhost:9840"
• is required by: HDFS-12242 Limit the protocols on client and service RPC ports

Sub-Tasks

• Always start NameNode Service RPC Server: Open