Improve namenode scalability by splitting the FSNamesystem synchronized section
in a read/write lock
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Key: HDFS-1093
URL: https://issues.apache.org/jira/browse/HDFS-1093
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: dhruba borthakur
Assignee: dhruba borthakur
Most critical data structures in the NameNode (NN) are protected by a
syncronized methods in the FSNamesystem class. This essentially makes critical
code paths in the NN single-threaded. However, a large percentage of the NN
calls are listStatus, getBlockLocations, etc which do not change internal data
structures at all, these are read-only calls. If we change the FSNamesystem
lock to a read/write lock, many of the above operations can occur in parallel,
thus improving the scalability of the NN.
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