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Date: Mon, 21 Jun 2010 20:59:57 -0400 (EDT)
From: "sam rash (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Commented: (HDFS-1218) 20 append: Blocks recovered on
 startup should be treated with lower priority during block synchronization
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    [ https://issues.apache.org/jira/browse/HDFS-1218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12880990#action_12880990 ] 

sam rash commented on HDFS-1218:
--------------------------------

disregard comment above, was meant for hdfs-895


> 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-append
>
>         Attachments: 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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