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Posted to mapreduce-issues@hadoop.apache.org by "Siddharth Seth (Updated) (JIRA)" <ji...@apache.org> on 2012/01/23 20:15:40 UTC
[jira] [Updated] (MAPREDUCE-3710) last split generated by
FileInputFormat.getSplits may not have the best locality
[ https://issues.apache.org/jira/browse/MAPREDUCE-3710?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Siddharth Seth updated MAPREDUCE-3710:
--------------------------------------
Status: Patch Available (was: Open)
> last split generated by FileInputFormat.getSplits may not have the best locality
> --------------------------------------------------------------------------------
>
> Key: MAPREDUCE-3710
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3710
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv1, mrv2
> Affects Versions: 1.0.0, 0.23.0
> Reporter: Siddharth Seth
> Assignee: Siddharth Seth
> Attachments: MR-3710_v1.txt
>
>
> The last split generated by FileInputFormat.getSplits considers {{blkLocations.length-1}} to be the hosts for the split.
> The last split may be larger than the rest (SPLIT_SLOP=1.1 by default) - in which case locality is picked up from a smaller block.
> e.g. 1027MB file with a 128MB split size. The last split ends up being 131MB. The hosts for locality end up being the nodes containing the 3MB block instead of the 128MB block.
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