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From "Zhihong Yu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4657) Improve the efficiency of our MR jobs with a few configurations
Date Thu, 22 Mar 2012 19:44:22 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13235947#comment-13235947

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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