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