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Posted to issues@hbase.apache.org by "Jimmy Xiang (JIRA)" <ji...@apache.org> on 2013/05/30 23:08:20 UTC

[jira] [Commented] (HBASE-8635) Define prefetcher.resultsize.max as percentage

    [ https://issues.apache.org/jira/browse/HBASE-8635?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13670717#comment-13670717 ] 

Jimmy Xiang commented on HBASE-8635:
------------------------------------

Attached a patch. It changed the meaning of "hbase.hregionserver.prefetcher.resultsize.max" from the actual bytes to the percentage.  Didn't change the parameter name. Added a check to make sure the value is between 0 and 1.  The default is 0.1.  The max heap size is calculated only once in HRegionServer to save some time, although it could change according to the java doc.
                
> Define prefetcher.resultsize.max as percentage
> ----------------------------------------------
>
>                 Key: HBASE-8635
>                 URL: https://issues.apache.org/jira/browse/HBASE-8635
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Ted Yu
>            Assignee: Jimmy Xiang
>            Priority: Minor
>         Attachments: trunk-8635.patch
>
>
> Currently "hbase.hregionserver.prefetcher.resultsize.max" defines global limit for prefetching.
> The default value is 256MB.
> It would be more flexible to define this measure as a percentage of the heap.

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