[ http://issues.apache.org/jira/browse/HADOOP-410?page=all ]
Doug Cutting resolved HADOOP-410.
---------------------------------
Resolution: Fixed
I just committed this. Thanks, Milind!
> Using HashMap instead of TreeMap for some maps in Namenode yields 17%
> performance improvement
> ---------------------------------------------------------------------------------------------
>
> Key: HADOOP-410
> URL: http://issues.apache.org/jira/browse/HADOOP-410
> Project: Hadoop
> Issue Type: Improvement
> Components: dfs
> Affects Versions: 0.5.0
> Environment: linux
> Reporter: Milind Bhandarkar
> Assigned To: Milind Bhandarkar
> Fix For: 0.5.0
>
> Attachments: hashmap.patch
>
>
> For blocksMap in FSNameSystem and activeBlocks map in FSDirectory, if we use
> HashMap instead of TreeMap, it yields 17% performance improvement (without
> significant difference in memory consumption).
> I am attaching a patch, alongwith a namenode benchmark.
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