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https://issues.apache.org/jira/browse/HBASE-8410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13763515#comment-13763515
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stack commented on HBASE-8410:
------------------------------
I took a look.
The Interface is named NamespaceDescriptorRetriever. A related, more general
Interface for dealing with TableDescriptors is called TableDescriptors. For
consistency should this Interface not be called NamespaceDescriptors?
Does it belong in hbase-common rather than in hbase-server?
The method list returns a Set which is a little disorientating. In
TableDescriptors, the equivalent method is named getAll.
NamespaceController seems a too general name for a class that does resource
checking. NamespaceResourceChecker or NamespaceAuditor?
Why is this not package private? +public class NamespaceTableAndRegionInfo {
Is not used in this package only?
How often do we do this: getNamespaceTableAndRegionInfo ?
We start this in the RS. Do we have to stop it when done?
+ this.zkNamespaceManager.start();
Do we have to add this to RegionServerServices? getNamespaceDescRetriever ?
Does the ZKNamespaceManager in RS do anything? Does it have to be on the RS?
Can't master do necessary checks?
Thanks.
> Basic quota support for namespaces
> ----------------------------------
>
> Key: HBASE-8410
> URL: https://issues.apache.org/jira/browse/HBASE-8410
> Project: HBase
> Issue Type: Sub-task
> Reporter: Francis Liu
> Assignee: Vandana Ayyalasomayajula
> Attachments: HBASE_8410_1_trunk.patch, HBASE_8410.patch,
> HBASE-8410_trunk_2.patch, HBASE-8410_trunk_3.patch, HBASE-8410_trunk_4.patch,
> HBASE-8410_trunk_4.patch, HBASE-8410_trunk_5.patch, HBASE-8410_trunk_6.patch,
> HBASE-8410_trunk_7.patch
>
>
> This task involves creating an observer which provides basic quota support to
> namespaces in terms of (1) number of tables and (2) number of regions. The
> quota support can be enabled by setting:
> <property>
> <name>hbase.coprocessor.region.classes</name>
> <value>org.apache.hadoop.hbase.namespace.NamespaceController</value>
> </property>
> <property>
> <name>hbase.coprocessor.master.classes</name>
> <value>org.apache.hadoop.hbase.namespace.NamespaceController</value>
> </property>
> in the hbase-site.xml.
> To add quotas to namespace, while creating namespace properties need to be
> added.
> Examples:
> 1. namespace_create 'ns1', {'hbase.namespace.quota.maxregion'=>'10'}
> 2. 1. namespace_create 'ns2', {'hbase.namespace.quota.maxtables'=>'2'},
> {'hbase.namespace.quota.maxregion'=>'5'}
> The quotas can be modified/added to namespace at any point of time.
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