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Posted to issues@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2011/06/11 01:04:58 UTC

[jira] [Updated] (HBASE-3928) Some potential performance improvements to Bytes/KeyValue

     [ https://issues.apache.org/jira/browse/HBASE-3928?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack updated HBASE-3928:
-------------------------

    Priority: Critical  (was: Minor)

Marking critical because has patch available and perf.

> Some potential performance improvements to Bytes/KeyValue
> ---------------------------------------------------------
>
>                 Key: HBASE-3928
>                 URL: https://issues.apache.org/jira/browse/HBASE-3928
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.92.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Critical
>         Attachments: hbase-3928.txt
>
>
> We use Bytes.compareTo() a lot where we could be using a more efficient equals() method. The trick that makes equals() faster than compareTo is that we can short-circuit two common cases:
> Case 1) the length is not the same - only need to do one comparison
> Case 2) the two arrays have the same length and a common prefix: compare the last byte first, since it's the one most likely to differ (given we are usually comparing adjacent sorted data).

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