[jira] [Created] (HDFS-17385) [FGL] Replace the global FS locking with directory tree-based fine-grained locking

["ZanderXu (Jira)" <ji...@apache.org>]

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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