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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8420) Port HBASE-6874 Implement prefetching for scanners from 0.89-fb
Date Fri, 24 May 2013 21:57:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13666725#comment-13666725

Jimmy Xiang commented on HBASE-8420:

Did some testing with ycsb?  The scan throughput is improved by about 6.5% with the latest
patch. One issue with this testing is that the client side doesn't do too much with the result,
so the benefit of prefetching is not fully used.

By default, prefetching is enabled in the trunk version. To turn it of, users have to turn
it off in the Scan object.

In the 0.94 version, however, prefetching is disabled so as not to change the existing behavior.

If no objection, I will push the trunk version in.  However, for the 0.94 version, I will
wait for [~lhofhansl] to have a review.
> Port  HBASE-6874  Implement prefetching for scanners from 0.89-fb
> -----------------------------------------------------------------
>                 Key: HBASE-8420
>                 URL: https://issues.apache.org/jira/browse/HBASE-8420
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Jimmy Xiang
>            Assignee: Jimmy Xiang
>         Attachments: 0.94-8420_v1.patch, 0.94-8420_v2.patch, 0.94-8420_v6.1.patch, trunk-8420_v1.patch,
trunk-8420_v2.patch, trunk-8420_v3.patch, trunk-8420_v4.patch, trunk-8420_v5.1.patch, trunk-8420_v5.patch,
trunk-8420_v6.1.patch, trunk-8420_v6.patch
> This should help scanner performance.  We should have it in trunk.

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