ZanderXu created HDFS-17489:
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Summary: [FGL] Implement a LockPool
Key: HDFS-17489
URL: https://issues.apache.org/jira/browse/HDFS-17489
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: ZanderXu
Assignee: ZanderXu
A lockPool to mange all locks.
It will allocate a lock and cache it if this lock doesn't been cached when
acquiring lock, and it will uncache a unused lock from memory when releasing
lock.
And it also should support persist locks in memory
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