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From "Uma Maheswara Rao G (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3573) Supply NamespaceInfo when instantiating JournalManagers
Date Wed, 12 Sep 2012 11:33:09 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13453905#comment-13453905
] 

Uma Maheswara Rao G commented on HDFS-3573:
-------------------------------------------

Todd, any reason for not porting this to branch-2 ?
I plan to port some of the BKJM improvements. But they are depending on this change from trunk.

Thanks a lot,
Uma
                
> Supply NamespaceInfo when instantiating JournalManagers
> -------------------------------------------------------
>
>                 Key: HDFS-3573
>                 URL: https://issues.apache.org/jira/browse/HDFS-3573
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>    Affects Versions: 3.0.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Minor
>             Fix For: 3.0.0
>
>         Attachments: hdfs-3573.txt, hdfs-3573.txt, hdfs-3573.txt, hdfs-3573.txt
>
>
> Currently, the JournalManagers are instantiated before the NamespaceInfo is loaded from
local storage directories. This is problematic since the JM may want to verify that the storage
info associated with the journal matches the NN which is starting up (eg to prevent an operator
accidentally configuring two clusters against the same remote journal storage). This JIRA
rejiggers the initialization sequence so that the JMs receive NamespaceInfo as a constructor
argument.

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