Description
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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Attachments
Issue Links
- relates to
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HDFS-1440 TestComputeInvalidateWork fails intermittently
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- Closed
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