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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HBASE-6874) Implement prefetching for scanners
Date Thu, 25 Apr 2013 18:04:18 GMT

     [ https://issues.apache.org/jira/browse/HBASE-6874?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Jimmy Xiang resolved HBASE-6874.

       Resolution: Fixed
    Fix Version/s: 0.89-fb
> Implement prefetching for scanners
> ----------------------------------
>                 Key: HBASE-6874
>                 URL: https://issues.apache.org/jira/browse/HBASE-6874
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Karthik Ranganathan
>            Assignee: Karthik Ranganathan
>             Fix For: 0.89-fb
> I did some quick experiments by scanning data that should be completely in memory and
found that adding pre-fetching increases the throughput by about 50% from 26MB/s to 39MB/s.
> The idea is to perform the next in a background thread, and keep the result ready. When
the scanner's next comes in, return the pre-computed result and issue another background read.

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