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https://issues.apache.org/jira/browse/HDFS-17330?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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farmmamba resolved HDFS-17330.
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    Resolution: Not A Problem

> 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
>            Priority: Major
>
> After HDFS-15382, dn uses fine-grained lock.
> So we should better use LongAdder instead of AtomicLong in class 
> CachingGetSpaceUsed.



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