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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2223) Untangle depencencies between NN components
Date Thu, 04 Aug 2011 05:55:27 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2223?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HDFS-2223:
------------------------------

    Attachment: hdfs-2223-2.txt

A little further cleanup - no longer need to keep checkpointDirs around as state inside FSImage,
since it's truly a load-time thing.

> 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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