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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2223) Untangle depencencies between NN components
Date Wed, 10 Aug 2011 00:37:28 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13082023#comment-13082023
] 

Aaron T. Myers commented on HDFS-2223:
--------------------------------------

+1, patch looks good to me.

One question: It seems like it wouldn't be too tough to also remove the reference to {{FSNamesystem}}
from {{FSDirectory}}. Why not do that here? Feel free to say this should be done in a separate
JIRA.

> Untangle depencencies between NN components
> -------------------------------------------
>
>                 Key: HDFS-2223
>                 URL: https://issues.apache.org/jira/browse/HDFS-2223
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>    Affects Versions: 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hdfs-2223-1.txt, hdfs-2223-2.txt
>
>
> Working in the NN a lot for HA (HDFS-1623) I've come across a number of situations where
the tangled dependencies between NN components has been problematic for adding new features
and for testability. It would be good to untangle some of these and clarify what the distinction
is between the different components: NameNode, FSNamesystem, FSDirectory, FSImage, NNStorage,
and FSEditLog

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