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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1061) Memory footprint optimization for INodeFile object.
Date Wed, 24 Mar 2010 16:07:27 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12849244#action_12849244
] 

Tsz Wo (Nicholas), SZE commented on HDFS-1061:
----------------------------------------------

We probably could safely assume that preferredBlockSize is a power of 2.  In such case, only
the exponents need be stored.  A 6-bit integer is good enough.

> 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
>            Priority: Minor
>             Fix For: 0.22.0
>
>
> 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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