ZanderXu created HDFS-17388:
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Summary: [FGL] Create RPC supports this fine-grained locking I
Key: HDFS-17388
URL: https://issues.apache.org/jira/browse/HDFS-17388
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: ZanderXu
The create RPC just involves directory tree if it creates a new file, and most
scenes are like this. It involves blocks only if the file is existing and it
tries to overwrite it.
So in most scenarios, the create RPC just needs FS lock.
The current implementation just holds the global write lock, so in order for
the improvement to be better accepted, the first step is just to replace the
lock mode without changing logic. We can minimize the scope of the global BM
lock in the second step.
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