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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6621) Reduce calls to Bytes.toInt
Date Wed, 22 Aug 2012 13:49:44 GMT

    [ 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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