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Posted to hdfs-dev@hadoop.apache.org by "Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org> on 2010/04/28 10:15:32 UTC

[jira] Created: (HDFS-1114) Reducing NameNode memory usage by an alternate hash table

Reducing NameNode memory usage by an alternate hash table
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                 Key: HDFS-1114
                 URL: https://issues.apache.org/jira/browse/HDFS-1114
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: name-node
            Reporter: Tsz Wo (Nicholas), SZE


NameNode uses a java.util.HashMap to store BlockInfo objects.  When there are many blocks in HDFS, this map uses a lot of memory in the NameNode.  We may optimize the memory usage by a light weight hash table implementation.

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