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Posted to issues@hbase.apache.org by "Zhihong Yu (JIRA)" <ji...@apache.org> on 2012/05/02 16:02:50 UTC
[jira] [Commented] (HBASE-5915) Improve performance of KeyValue
comparison
[ https://issues.apache.org/jira/browse/HBASE-5915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13266575#comment-13266575 ]
Zhihong Yu commented on HBASE-5915:
-----------------------------------
The following variable doesn't seem to be used:
{code}
+ int triggerBoundsCheck = buf[off + SIZEOF_LONG - 1];
{code}
What's its purpose ?
> Improve performance of KeyValue comparison
> ------------------------------------------
>
> Key: HBASE-5915
> URL: https://issues.apache.org/jira/browse/HBASE-5915
> Project: HBase
> Issue Type: Improvement
> Components: performance
> Affects Versions: 0.94.1
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: hbase-5915.txt
>
>
> Got bored tonight and poked around at making KeyValue comparison faster. I was able to get a ~23% speedup on a micro-benchmark I wrote by using Unsafe in a few more places. This should make some difference for real workloads, since this is usually one of the top CPU consumers.
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