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https://issues.apache.org/jira/browse/HDFS-1171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12921054#action_12921054
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Patrick Kling commented on HDFS-1171:
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In order to be able to handle a larger number of simultaneous block losses, we
should have the option of dispatching map reduce jobs to fix the affected files
in a distributed fashion. For greater flexibility, we propose a configuration
option that specifies whether to use the local or the distributed
implementation of the block fixer.
> RaidNode should fix missing blocks directly on Data Node
> --------------------------------------------------------
>
> Key: HDFS-1171
> URL: https://issues.apache.org/jira/browse/HDFS-1171
> Project: Hadoop HDFS
> Issue Type: Task
> Components: contrib/raid
> Affects Versions: 0.20.1
> Reporter: Ramkumar Vadali
>
> RaidNode currently does not fix missing blocks. The missing blocks have to be
> fixed manually.
> This task proposes that recovery be more automated:
> 1. RaidNode periodically fetches a list of corrupt files from the NameNode
> 2. If the corrupt files has a RAID parity file, RaidNode identifies missing
> block(s) in the file and recomputes the block(s) using the parity file and
> other good blocks
> 3. RaidNode sends the generated block contents to a DataNode
> a. RaidNode chooses a DataNode with the most available space to send the
> block.
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