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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-14628) Save object creation for scanning with FAST_DIFF encoding
Date Sat, 17 Oct 2015 05:19:05 GMT

     [ https://issues.apache.org/jira/browse/HBASE-14628?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Lars Hofhansl updated HBASE-14628:
    Attachment: 14628-0.98.txt

Found the problem. Here's a 0.98 patch.
The actual macro win is 5% (not the 10% I promised above).

Readability is roughly equal, I feel. Have a look and let me whether it's worth the change.

> Save object creation for scanning with FAST_DIFF encoding
> ---------------------------------------------------------
>                 Key: HBASE-14628
>                 URL: https://issues.apache.org/jira/browse/HBASE-14628
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>         Attachments: 14628-0.98.txt
> I noticed that (at least in 0.98 - master is entirely different) we create ByteBuffer
just to create a byte[], which is then used to create a KeyValue.
> We can save the creation of the ByteBuffer and hence save allocating an extra object
for each KV we find by creating the byte[] directly.
> In a Phoenix count\(*) query that saved from 10% of runtime.

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