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https://issues.apache.org/jira/browse/MAPREDUCE-1819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12919108#action_12919108
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Scott Chen commented on MAPREDUCE-1819:
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+1 Looks good.
Let's wait for a few days. Then I will commit it.
> RaidNode should be smarter in submitting Raid jobs
> --------------------------------------------------
>
> Key: MAPREDUCE-1819
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1819
> Project: Hadoop Map/Reduce
> Issue Type: Task
> Components: contrib/raid
> Affects Versions: 0.20.1
> Reporter: Ramkumar Vadali
> Assignee: Ramkumar Vadali
> Attachments: MAPREDUCE-1819.4.patch, MAPREDUCE-1819.patch,
> MAPREDUCE-1819.patch.2, MAPREDUCE-1819.patch.3
>
>
> The RaidNode currently computes parity files as follows:
> 1. Using RaidNode.selectFiles() to figure out what files to raid for a policy
> 2. Using #1 repeatedly for each configured policy to accumulate a list of
> files.
> 3. Submitting a mapreduce job with the list of files from #2 using
> DistRaid.doDistRaid()
> This task addresses the fact that #2 and #3 happen sequentially. The proposal
> is to submit a separate mapreduce job for the list of files for each policy
> and use another thread to track the progress of the submitted jobs. This will
> help reduce the time taken for files to be raided.
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