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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 01:20:39 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13229819#comment-13229819
] 

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

The format-addStorageDir solution make the failed directory "active" immediately even it's
not a real active state. The state is visible from the nn UI and JMX. If the checkpoint fails,
the fake "Active" state can be misleading.

The copy-over solution may do some extra work but it sets the recovered storage directories
in the real active state. 


I agree those 3 JIRA issues you mentioned should be back ported too to branch 1.02 (the backport
patch here is for branch-1 not 1.02). 

It's a good point about the network mount problem. :-)  
It's also a problem with original patch: the "format-addStorageDir" creates the storage directory
if it doesn't exist. However, if this storage directory is a mount point, it shouldn't be
created automatically. HDFS-3095 is filed for this issue.

                
> 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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