farmmamba created HDFS-17330:
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Summary: CachingGetSpaceUsed#used should use LongAdder after DN
splits lock
Key: HDFS-17330
URL: https://issues.apache.org/jira/browse/HDFS-17330
Project: Hadoop HDFS
Issue Type: Improvement
Components: datanode
Affects Versions: 3.3.6
Reporter: farmmamba
Assignee: farmmamba
After HDFS-15382, dn uses fine-grained lock.
So we should better use LongAdder instead of AtomicLong in class
CachingGetSpaceUsed.
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