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From "Jakob Homan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1061) Memory footprint optimization for INodeFile object.
Date Sat, 24 Apr 2010 20:45:51 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12860584#action_12860584
] 

Jakob Homan commented on HDFS-1061:
-----------------------------------

The patch looks good, but Hudson is right - we should have some basic sanity unit tests here,
if for no other reason, than to catch any mistakes that may be introduced later that don't
jive with the assumptions made in the patch.  The new logic in INodeFile is easily testable.
 I'll +1 and commit once some basic unit tests are included.

> 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.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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