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From "Bharath Mundlapudi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1061) Memory footprint optimization for INodeFile object.
Date Mon, 10 May 2010 20:06:31 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12865899#action_12865899
] 

Bharath Mundlapudi commented on HDFS-1061:
------------------------------------------

Thanks for the review, Jakob.

Some thoughts on your comments:

1. Yes, Zero replica seems odd but didn't want to break the old semantics since earlier versions
was allowing 0 and < 0 values. Atleast its clear NOT accept < 0 values. 
2.  The reason i put always-fail assert because the test-case always throws an exception.


Let me know if you want me to add/change something. 



> 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.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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