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From "Uma Maheswara Rao G (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3075) Add mechanism to restore the removed storage directories
Date Sun, 11 Mar 2012 22:28:39 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13227256#comment-13227256

Uma Maheswara Rao G commented on HDFS-3075:

Hi Brandon,
It seems to me that you are looking for the same issue(HADOOP-4885) which is already addressed
Also we have the property to enable or disable that feature "dfs.namenode.name.dir.restore".
Are you talking about some other issue/improvement here?
> Add mechanism to restore the removed storage directories
> --------------------------------------------------------
>                 Key: HDFS-3075
>                 URL: https://issues.apache.org/jira/browse/HDFS-3075
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>    Affects Versions: 0.24.0, 1.1.0
>            Reporter: Brandon Li
>            Assignee: Brandon Li
> When a storage directory is inaccessible, namenode removes it from the valid storage
dir list to a removedStorageDirs list. Those storage directories will not be restored when
they become healthy again. 
> The proposed solution is to restore the previous failed directories at the beginning
of checkpointing, say, rollEdits, by copying necessary metadata files from healthy directory
to unhealthy ones. In this way, whenever a failed storage directory is recovered by the administrator,
he/she can immediately force a checkpointing to restored a failed directory.

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