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https://issues.apache.org/jira/browse/HADOOP-17997?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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xi chaomin resolved HADOOP-17997.
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Resolution: Won't Fix
> RBF: Namespace usage of mount table with multi subclusters can exceed quota
> ---------------------------------------------------------------------------
>
> Key: HADOOP-17997
> URL: https://issues.apache.org/jira/browse/HADOOP-17997
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs
> Reporter: xi chaomin
> Priority: Major
> Labels: pull-request-available
> Attachments: 1636424307319.jpg
>
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> # mkdir on each subcluster /test10
> # mount table: hdfs dfsrouteradmin -add /test10 ns1,ns2 /test10
> # set quota: hdfs dfsrouteradmin -setQuota /test10 -nsQuota 4
> # touch two files under hdfs://\{fed}/test10, now the namespace usage is 4(2
> directories and 2 files).
> # refresh and put a new file, the put is successfull, and the namespace
> usage comes to 5.
> !1636424307319.jpg!
> The router checks quota without considering the increments, It is difficult
> to limit quota precisely without increments , but throw exception when usage
> >= quota will be better.
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