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https://issues.apache.org/jira/browse/HDFS-2197?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated HDFS-2197:
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Attachment: hdfs-2197.txt
First pass at this refactoring. I moved all of the protocol implementation
methods and the start/stop of the RPC server into a new NameNodeRPCServer class.
It involved a fair number of changes to unit tests which were calling these
methods directly on a NameNode instance. MiniDFSCluster now exposes a separate
function to get a NamenodeProtocols object -- I think this is a net win, since
it makes it clear when unit tests are calling internal methods (like
nn.getFSImage()) vs methods which are accessible to clients via RPC (like
mkdirs)
> Refactor RPC call implementations out of NameNode class
> -------------------------------------------------------
>
> 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
> Attachments: hdfs-2197.txt
>
>
> 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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