ZanderXu created HDFS-17387:
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Summary: [FGL] Abstract selectable locking mode
Key: HDFS-17387
URL: https://issues.apache.org/jira/browse/HDFS-17387
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: ZanderXu
Abstract a lock mode to cover the current global lock and the new fine-grained
lock(global FS lock and global BM lock).
End-user can select to use lock mode through configuration.
The possible lock modes after this patch are as follows:
* GLOBAL Lock
* FS Lock
* BM Lock
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