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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2197) Refactor RPC call implementations out of NameNode class
Date Tue, 26 Jul 2011 01:45:10 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13070900#comment-13070900
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Todd Lipcon commented on HDFS-2197:
-----------------------------------

I had a first pass at this today and it's fairly doable. But, it will probably conflict a
lot with the BackupNode changes in HDFS-1073, so I plan to target this for _after_ that branch
is merged into a trunk.

> 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
>
> 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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