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https://issues.apache.org/jira/browse/MAPREDUCE-801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12735967#action_12735967
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Hong Tang commented on MAPREDUCE-801:
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@doug, the motivation of this jira is PIG-878. The fact that such a bug has
slipped through our eyes for a long time is worrisome. I am open to alternative
proposals. But limiting the total number of locations for a very job may not be
useful because a large job is likely to touch some blocks on every host.
> MAPREDUCE framework should issue warning with too many locations for a split
> ----------------------------------------------------------------------------
>
> Key: MAPREDUCE-801
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-801
> Project: Hadoop Map/Reduce
> Issue Type: New Feature
> Reporter: Hong Tang
>
> Customized input-format may be buggy and report misleading locations through
> input-split, an example of which is PIG-878. When an input split returns too
> many locations, it would not only artificially inflate the percentage of data
> local or rack local maps, but also force scheduler to use more memory and
> work harder to conduct task assignment.
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