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From "Uma Maheswara Rao G (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 Thu, 29 Mar 2012 09:12:32 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13241096#comment-13241096
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Uma Maheswara Rao G commented on HDFS-1218:
-------------------------------------------

Todd, here is the JIRA filed HDFS-3161
                
> 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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