ZanderXu created HDFS-17385:
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Summary: [FGL] Replace the global FS locking with directory
tree-based fine-grained locking
Key: HDFS-17385
URL: https://issues.apache.org/jira/browse/HDFS-17385
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: ZanderXu
Second, we can replace the global FS locking with directory tree-based
fine-grained locking.
This ticket doesn't remove this global FS locking, it just replaces the global
FS write lock with the global FS read lock and directory tree-based
fine-grained lock.
For block-related operations and DN-related operations still need the global BM
lock.
The lock order should be:
* The global FS lock
* The global BM lock
* The directory tree-based fine-grained lock
This ticket should supports:
* End-user can choose lock mode
** One global lock mode
** Global FS lock and global BM lock mode
** Global FS read lock, global BM lock and tree-based fine-grained lock
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