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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, 10 May 2013 21:31:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13654866#comment-13654866
] 

Jimmy Xiang commented on HBASE-8420:
------------------------------------

Did some quest scan testing with YCSB on a same cluster: 1 master node + 4 region server nodes.
 All are the same except the hbase jar file.
Total rows: 3,000,000.  Scan ops count: 3,000 (not that many).

With prefetching (v2):

throughput: 36.9 ops/sec, avg latency: 27.0 ms, 95th: 48 ms, 99th: 69 ms

Without prefetching (without the patch at all):

throughput: 32.8 ops/sec, avg latency: 30.4 ms, 95th: 50 ms, 99th: 227 ms

On average, the latency is about 10% shorter.

                
> 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, trunk-8420_v1.patch, trunk-8420_v2.patch,
trunk-8420_v3.patch
>
>
> This should help scanner performance.  We should have it in trunk.

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