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Date: Thu, 23 Aug 2012 00:49:44 +1100 (NCT)
From: "Hudson (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-6621) Reduce calls to Bytes.toInt
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    [ https://issues.apache.org/jira/browse/HBASE-6621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13439500#comment-13439500 ] 

Hudson commented on HBASE-6621:
-------------------------------

Integrated in HBase-0.94-security #48 (See [https://builds.apache.org/job/HBase-0.94-security/48/])
    HBASE-6621 Reduce calls to Bytes.toInt (Revision 1375665)

     Result = FAILURE
larsh : 
Files : 
* /hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/KeyValue.java
* /hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileReaderV2.java

                
> Reduce calls to Bytes.toInt
> ---------------------------
>
>                 Key: HBASE-6621
>                 URL: https://issues.apache.org/jira/browse/HBASE-6621
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>            Priority: Minor
>             Fix For: 0.96.0, 0.94.2
>
>         Attachments: 6621-0.96.txt, 6621-0.96-v2.txt, 6621-0.96-v3.txt, 6621-0.96-v4.txt
>
>
> Bytes.toInt shows up quite often in a profiler run.
> It turns out that one source is HFileReaderV2$ScannerV2.getKeyValue().
> Notice that we call the KeyValue(byte[], int) constructor, which forces the constructor to determine its size by reading some of the header information and calculate the size. In this case, however, we already know the size (from the call to readKeyValueLen), so we could just use that.
> In the extreme case of 10000's of columns this noticeably reduces CPU. 

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