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Posted to issues@hbase.apache.org by "Lars Hofhansl (Updated) (JIRA)" <ji...@apache.org> on 2012/03/22 20:34:23 UTC

[jira] [Updated] (HBASE-4657) Improve the efficiency of our MR jobs with a few configurations

     [ https://issues.apache.org/jira/browse/HBASE-4657?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lars Hofhansl updated HBASE-4657:
---------------------------------

    Attachment: 4657.txt

How about something as simple as this.
Set cacheBlocks to false where appropriate, and also advises how to disable speculative execution and to set scanner caching to 100.
                
> 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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