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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5727) Faster, simpler id.hashCode() which does not allocate memory
Date Sat, 25 Apr 2009 09:46:30 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12702671#action_12702671

Hadoop QA commented on HADOOP-5727:

-1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 768376.

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no tests are needed for this patch.

    -1 patch.  The patch command could not apply the patch.

Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/240/console

This message is automatically generated.

> Faster, simpler id.hashCode() which does not allocate memory
> ------------------------------------------------------------
>                 Key: HADOOP-5727
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5727
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Shevek
>         Attachments: 00_id-noallocate.patch
> Integer.valueOf allocates memory if the integer is not in the object-cache, which is
the vast majority of cases for the task id. It is possible to compute the hash code of an
integer without going via the integer cache, and hence avoiding allocating memory.

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