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Posted to common-dev@hadoop.apache.org by "eric baldeschwieler (JIRA)" <ji...@apache.org> on 2006/10/16 19:54:36 UTC
[jira] Updated: (HADOOP-603) Extend SequenceFile to provide MapFile
function by storing index at the end of the file
[ 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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