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From "Brandon Li (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-4885) Try to restore failed replicas of Name Node storage (at checkpoint time)
Date Thu, 15 Mar 2012 16:55:39 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13230297#comment-13230297
] 

Brandon Li commented on HADOOP-4885:
------------------------------------

I did manual tests before including the unit tests in the backport patch. 

The new edit log is immediately created in the new storage directory, but the rolled edit
log doesn't exist in the recovered storage directory. From the NN UI, the healthy storage
directory and recovered directory both have "Active" status. This is why I said it's "misleading".

It would be a more obvious problem when the storage directory is a fsimage only directory.
From the NN UI/JMX, the administrator can't tell which "Active" storage directory has fsimage
inside and which doesn't. The same "Active" state here means differently at differnt time
with different directories.
                
> Try to restore failed replicas of Name Node storage (at checkpoint time)
> ------------------------------------------------------------------------
>
>                 Key: HADOOP-4885
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4885
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Boris Shkolnik
>            Assignee: Boris Shkolnik
>             Fix For: 0.21.0
>
>         Attachments: HADOOP-4885-1.patch, HADOOP-4885-3.patch, HADOOP-4885-3.patch, HADOOP-4885.branch-1.patch,
HADOOP-4885.branch-1.patch.2, HADOOP-4885.branch-1.patch.3, HADOOP-4885.patch, HADOOP-4885.patch
>
>


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