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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6874) Implement prefetching for scanners
Date Tue, 06 Nov 2012 19:28:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13491740#comment-13491740
] 

Lars Hofhansl commented on HBASE-6874:
--------------------------------------

Oh, I see. I had assumed the prefetching would be implemented on the client only (the RPCs
for scanning could be scheduled asynchronously, so the caller never has to wait for them);
but obviously there are many ways to do this.

                
> 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
>
> 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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