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https://issues.apache.org/jira/browse/HBASE-5401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14276336#comment-14276336
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Nick Dimiduk commented on HBASE-5401:
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I don't know why the 10x multiplier is there. I usually run in --nomapred mode,
so I haven't thought about this much. If you want to work out a patch we can
get it committed.
> PerformanceEvaluation generates 10x the number of expected mappers
> ------------------------------------------------------------------
>
> Key: HBASE-5401
> URL: https://issues.apache.org/jira/browse/HBASE-5401
> Project: HBase
> Issue Type: Bug
> Components: test
> Reporter: Oliver Meyn
>
> With a command line like 'hbase org.apache.hadoop.hbase.PerformanceEvaluation
> randomWrite 10' there are 100 mappers spawned, rather than the expected 10.
> The culprit appears to be the outer loop in writeInputFile which sets up 10
> splits for every "asked-for client". I think the fix is just to remove that
> outer loop.
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