[HDFS-2197] Refactor RPC call implementations out of NameNode class

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.23.0
• Fix Version/s: HA branch (HDFS-1623), 0.23.0
• Component/s: namenode
• Hadoop Flags: Reviewed
• Assignee: Todd Lipcon
• Reporter: Todd Lipcon
• Created: 26/Jul/11 01:43
• Updated: 16/Mar/15 18:07
• Resolved: 12/Sep/11 19:49

Description

For HA, the NameNode will gain a bit of a state machine, to be able to transition between standby and active states. This would be cleaner in the code if the NameNode class were just a container for various services, as discussed in HDFS-1974. It's also nice for testing, where it would become easier to construct just the RPC handlers around a mock NameSystem, with no HTTP server, for example.

This JIRA is to move all of the protocol implementations out of NameNode into a separate NameNodeRPCServer class.

Issue Links

• relates to: HDFS-2314 MRV1 test compilation broken after HDFS-2197