Konstantin Shvachko created HDFS-14731:
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Summary: [FGL] Remove redundant locking on NameNode.
Key: HDFS-14731
URL: https://issues.apache.org/jira/browse/HDFS-14731
Project: Hadoop HDFS
Issue Type: Sub-task
Components: namenode
Reporter: Konstantin Shvachko
Currently NameNode has two global locks: FSNamesystemLock and FSDirectoryLock.
An analysis shows that single FSNamesystemLock is sufficient to guarantee
consistency of the NameNode state. FSDirectoryLock can be removed.
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