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From "eric baldeschwieler (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-603) Extend SequenceFile to provide MapFile function by storing index at the end of the file
Date Mon, 16 Oct 2006 17:54:36 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-603?page=all ]

eric baldeschwieler updated HADOOP-603:
---------------------------------------

    Comment: was deleted

> Extend SequenceFile to provide MapFile function by storing index at the end of the file
> ---------------------------------------------------------------------------------------
>
>                 Key: HADOOP-603
>                 URL: http://issues.apache.org/jira/browse/HADOOP-603
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: Jim Kellerman
>
> MapFile increases the load on the name node as two files are created to provide a index
file format. If SequenceFile were extended by storing the index at the end of the file, 1/2
of the files currently created for a map/reduce operation would be needed, reducing the load
on the name node.
> Perhaps this is why Google implemented SSTable files in this manner. (SSTable files are
functionally identical to Hadoop MapFiles) (see the paper on BigTable - section 4 "Building
Blocks" http://labs.google.com/papers/bigtable.html)

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