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https://issues.apache.org/jira/browse/HDFS-12934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16294497#comment-16294497
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Yiqun Lin commented on HDFS-12934:
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Any comments are welcomed.
> RBF: Federation supports global quota
> -------------------------------------
>
> Key: HDFS-12934
> URL: https://issues.apache.org/jira/browse/HDFS-12934
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Affects Versions: 3.0.0
> Reporter: Yiqun Lin
> Assignee: Yiqun Lin
> Labels: RBF
>
> Now federation doesn't support set the global quota for each folder.
> Currently the quota will be applied for each subcluster under the specified
> folder via RPC call.
> It will be very useful for users that federation can support setting global
> quota and exposing the command of this.
> In a federated environment, a folder can be spread across multiple
> subclusters. For this reason, we plan to solve this by following way:
> # Set global quota across each subcluster. We don't allow each subcluster cab
> exceed maximun quota value.
> # We need to construct one <Path, QuotaUsage> cache map for storing current
> quota usage of these subclusters, Every time we want to do WRITE operation
> under specified folder, we will get its quota usage from cache and verify its
> quota. If quota exceeded, throw exception, otherwise update its quota usage
> in cache when finishing operations.
> The quota will be set to mount table and as a new field in mount table. The
> set/unset command will be like:
> {noformat}
> hdfs dfsrouteradmin -setQuota <nsQuota> <ssQuota> <mount table>
> hdfs dfsrouteradmin -clrQuota <mount table>
> {noformat}
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