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From "Shevek (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-5727) Faster, simpler id.hashCode() which does not allocate memory
Date Tue, 28 Apr 2009 15:39:30 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-5727?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Shevek updated HADOOP-5727:
---------------------------

    Attachment: 03_id-noallocate.patch

Another attempt at the patch, running svn diff from a different root.

> 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, 03_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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