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Date: Tue, 11 May 2010 14:09:43 -0400 (EDT)
From: "Jakob Homan (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Updated: (HDFS-1061) Memory footprint optimization for
 INodeFile object.
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     [ https://issues.apache.org/jira/browse/HDFS-1061?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jakob Homan updated HDFS-1061:
------------------------------

    Hadoop Flags: [Incompatible change, Reviewed]

Contrib test failure unrelated. +1. Marking as incompatible change due to more strict bounds checking.

> Memory footprint optimization for INodeFile object. 
> ----------------------------------------------------
>
>                 Key: HDFS-1061
>                 URL: https://issues.apache.org/jira/browse/HDFS-1061
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>    Affects Versions: 0.22.0
>            Reporter: Bharath Mundlapudi
>            Assignee: Bharath Mundlapudi
>            Priority: Minor
>             Fix For: 0.22.0
>
>         Attachments: HDFS-1061-1.patch, HDFS-1061-2.patch, HDFS-1061-3.patch, HDFS-1061.patch
>
>
> I am proposing a footprint optimization to merge blockReplication and preferredBlockSize fields into one 'long header' field in INodeFile class. This saves 8 bytes per INodeFile object on a 64 bit JVM. This memory optimization is transparent and changes are very minimal.

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