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https://issues.apache.org/jira/browse/HBASE-4657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13235947#comment-13235947
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Zhihong Yu commented on HBASE-4657:
-----------------------------------
Patch looks good.
What about src/main/java/org/apache/hadoop/hbase/mapred/RowCounter.java ?
FirstKeyOnlyFilter should be added there (can be done separately).
> Improve the efficiency of our MR jobs with a few configurations
> ---------------------------------------------------------------
>
> Key: HBASE-4657
> URL: https://issues.apache.org/jira/browse/HBASE-4657
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 0.90.4
> Reporter: Jean-Daniel Cryans
> Assignee: Lars Hofhansl
> Fix For: 0.94.0
>
> Attachments: 4657.txt
>
>
> This is a low hanging fruit, some of our MR jobs like RowCounter and
> CopyTable don't even setCacheBlocks on the scan object which out of the box
> completely screws up a running system. Another thing would be to disable
> speculative execution.
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