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From "Haohui Mai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7416) Revisit the abstraction between NameNodeRpcServer, FSNameSystem and FSDirectory
Date Mon, 01 Dec 2014 19:53:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14230334#comment-14230334
] 

Haohui Mai commented on HDFS-7416:
----------------------------------

This jira also separates different functionalities in {{FSNameSystem}} / {{FSDirectory}} into
different classes. Today {{FSNameSystem}} has around 8000~9000 lines of code. This jira proposes
to separate these 8000~9000 lines of code to different classes based for better maintainability.
I also plan to move the separated classes under a new package name (e.g. {{o.a.h.hdfs.namenode.namespace}})
once the initial refactoring is finished.

> Revisit the abstraction between NameNodeRpcServer, FSNameSystem and FSDirectory
> -------------------------------------------------------------------------------
>
>                 Key: HDFS-7416
>                 URL: https://issues.apache.org/jira/browse/HDFS-7416
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Haohui Mai
>            Assignee: Haohui Mai
>
> {{NameNodeRpcServer}}, {{FSNameSystem}} and {{FSDirectory}} implement the namespace of
the NN. In the current implementation the boundary of these classes are not fully clear.
> This jira tracks the efforts of clarifying the boundaries between these three classes
so that they can be more easily maintained in the long term.



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