[ http://issues.apache.org/jira/browse/HADOOP-603?page=all ]
eric baldeschwieler updated HADOOP-603:
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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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