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https://issues.apache.org/jira/browse/HBASE-21820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16777475#comment-16777475
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Guanghao Zhang commented on HBASE-21820:
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{quote}is this change going to be backward compatible
{quote}
There are no compatibility problem. As we only have CLUSTER scope quota in
protobuf but never implemented and exposed to client api. User can't set
CLUSTER scope quota before.
> Implement CLUSTER quota scope
> -----------------------------
>
> Key: HBASE-21820
> URL: https://issues.apache.org/jira/browse/HBASE-21820
> Project: HBase
> Issue Type: Sub-task
> Reporter: Yi Mei
> Assignee: Yi Mei
> Priority: Major
> Attachments: HBASE-21820.master.001.patch,
> HBASE-21820.master.002.patch, HBASE-21820.master.003.patch,
> HBASE-21820.master.004.patch, HBASE-21820.master.005.patch
>
>
> There are two kinds of quota scope: CLUSTER and MACHINE. CLUSTER quota means
> quota limit is shared by all machines of cluster. MACHINE quota means quota
> limit is used by single region server.
> Currently, all set quota operations use MACHINE scope as default and CLUSTER
> scope has not been implemented. So open this issue to implement CLUSTER quota
> scope.
> To split cluster quota limit to machines, the basic idea is for user,
> namespace, user over namespace and region server quota, use [ClusterLimit /
> RSNum] as machine limit. For table and user over table quota, use
> [ClusterLimit / TotalTableRegionNum * MachineTableRegionNum] as machine
> limit. Suggestions are welcomed.
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