Refactor RPC call implementations out of NameNode class
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Key: HDFS-2197
URL: https://issues.apache.org/jira/browse/HDFS-2197
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Affects Versions: 0.23.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
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.
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