ZanderXu created HDFS-17386:
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Summary: [FGL] Replace the global BM lock with directory
tree-based fine-grained lock
Key: HDFS-17386
URL: https://issues.apache.org/jira/browse/HDFS-17386
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: ZanderXu
Third, we need to replace the global BM lock with the directory tree-based
fine-grained locking.
All fine-grained locking tasks will be completed after this ticket.
The final lock mode is:
* The global FS read lock
* The directory tree-based fine-grained lock
Before this ticket, we need to revert some features first, which introduced
complex block dependencies, such as: HDFS-13671.
Since directory tree-based fine-grained locking only need to hold the write
lock of the underlaying child and the read lock of the parent or ancestor
directory, meta information changes for the parent or ancestor directory are
eventually consistent, such as: storage policy and quota.
This ticket will change some current implementation, so it's hard to let
end-user to choose to use lock mode through configuration.
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