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https://issues.apache.org/jira/browse/HDFS-14150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16724820#comment-16724820
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Takanobu Asanuma commented on HDFS-14150:
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We may be able to simply skip synchronization of the quota definition when the
mount point is multiple sub-clusters because users won't be confusing like a
single cluster. So the current specification may be good for multiple
sub-clusters.
> RBF: Quotas of the sub-cluster should be removed when removing the mount point
> ------------------------------------------------------------------------------
>
> Key: HDFS-14150
> URL: https://issues.apache.org/jira/browse/HDFS-14150
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Takanobu Asanuma
> Assignee: Takanobu Asanuma
> Priority: Major
> Labels: RBF
>
> From HDFS-14143
> {noformat}
> $ hdfs dfsrouteradmin -add /ns1_data ns1 /data
> $ hdfs dfsrouteradmin -setQuota /ns1_data -nsQuota 10 -ssQuota 10
> $ hdfs dfsrouteradmin -ls /ns1_data
> Source Destinations Owner
> Group Mode Quota/Usage
> /ns1_data ns1->/data tasanuma
> users rwxr-xr-x [NsQuota: 10/1, SsQuota:
> 10 B/0 B]
> $ hdfs dfsrouteradmin -rm /ns1_data
> $ hdfs dfsrouteradmin -add /ns1_data ns1 /data
> $ hdfs dfsrouteradmin -ls /ns1_data
> Source Destinations Owner
> Group Mode Quota/Usage
> /ns1_data ns1->/data tasanuma
> users rwxr-xr-x [NsQuota: -/-, SsQuota:
> -/-]
> $ hadoop fs -put file1 /ns1_data/file1
> put: The DiskSpace quota of /data is exceeded: quota = 10 B = 10 B but
> diskspace consumed = 402653184 B = 384 MB
> {noformat}
> This is because the quotas of the subclusters still remain after "hdfs
> dfsrouteradmin -rm". And "hdfs dfsrouteradmin -add" doesn't reflect the
> existing quotas.
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