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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