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https://issues.apache.org/jira/browse/MAPREDUCE-2042?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Johannes Zillmann updated MAPREDUCE-2042:
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Attachment: MAPREDUCE-2042.patch
Attached a [patch|^MAPREDUCE-2042.patch] for 0.20 branch which reads the splits
from file instead of creating them the second time.
> InputFormat#getSplits() is called twice in local mode
> -----------------------------------------------------
>
> Key: MAPREDUCE-2042
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2042
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: job submission
> Affects Versions: 0.20.1, 0.20.2
> Reporter: Johannes Zillmann
> Fix For: 0.20.3
>
> Attachments: MAPREDUCE-2042.patch
>
>
> In local mode the InputFormat#getSplits() is called twice in local mode.
> - 1st time: JobClient#writeOld/NewSplits() (then they write the splits to
> disk )
> - 2nd time: LocalJobRunner#run() (instead of reading the split file )
> That can become annoying in case the InputFormat access external resources or
> takes a little longer to create the splits.
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