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From "Todd Lipcon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1218) 20 append: Blocks recovered on startup should be treated with lower priority during block synchronization
Date Wed, 28 Mar 2012 21:27:29 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13240746#comment-13240746
] 

Todd Lipcon commented on HDFS-1218:
-----------------------------------

Since this issue has been closed a long time, mind opening a new one against branch-1? If
you could come up with a test case that would also be great. Seems like you could modify the
existing test cases just to make sure that the other replica eventually gets removed.
                
> 20 append: Blocks recovered on startup should be treated with lower priority during block
synchronization
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-1218
>                 URL: https://issues.apache.org/jira/browse/HDFS-1218
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>    Affects Versions: 0.20-append
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Critical
>             Fix For: 0.20.205.0
>
>         Attachments: HDFS-1218.20s.2.patch, hdfs-1281.txt
>
>
> When a datanode experiences power loss, it can come back up with truncated replicas (due
to local FS journal replay). Those replicas should not be allowed to truncate the block during
block synchronization if there are other replicas from DNs that have _not_ restarted.

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