ZanderXu created HDFS-17384:
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Summary: [FGL] Replace the global lock with global FS Lock and
global BM lock
Key: HDFS-17384
URL: https://issues.apache.org/jira/browse/HDFS-17384
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: ZanderXu
First, we can replace the current global lock with two locks, global FS lock
and global BM lock.
The global FS lock is used to make directory tree-related operations
thread-safe.
The global BM lock is used to make block-related operations and DN-related
operations thread-safe.
For some operations involving both directory tree and block or DN, the global
FS lock and the global BM lock are acquired.
There are some special requirements for this ticket.
* End-user can choose to use global lock or fine-grained lock through
configuration.
* Try not to modify the current implementation logic as much as possible.
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