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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
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sam rash commented on HDFS-1218:
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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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