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From "Lars Hofhansl (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4657) Improve the efficiency of our MR jobs with a few configurations
Date Wed, 21 Mar 2012 17:31:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13234549#comment-13234549
] 

Lars Hofhansl commented on HBASE-4657:
--------------------------------------

You mean cache blocks should be disabled?
I also found that none of our M/R jobs set scanner caching.
                
> 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
>             Fix For: 0.94.0
>
>
> 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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