Using HashMap instead of TreeMap for some maps in Namenode yields 17%
performance improvement
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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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