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https://issues.apache.org/jira/browse/HBASE-10576?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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rajeshbabu updated HBASE-10576:
-------------------------------
Attachment: HBASE-10576.patch
Here is the custom load balancer ensures co-location of user table regions and
correponding index table regions.
It is wrapper over normal load balancer like StochasticLoadBalancer or any other
which can be configurable(the configuration is
hbase.index.balancer.delegator.class).
*Before creating index table we should add both user table and index table to
balancer.
We may need to populate user table region locations from master to balancer.
{code}
IndexLoadBalancer#addTablesToColocate();
IndexLoadBalancer#populateRegionLocations();
{code}
*Similary while droping table we can remove the tables from colocation
{code}
IndexLoadBalancer#removeTablesFromColocation().
{code}
The above steps can be done through master coprocessor hooks because no direct
client APIs for this.
Hooks implemented in TestIndexLoadBalancer.MockedMasterObserver gives some
basic idea.
*We need set parent table attribute to index table descriptor to repopulate
tables to colocate on master startup.
{code}
htd.setValue(IndexLoadBalancer.PARENT_TABLE_KEY, userTableName.toBytes());
{code}
> Custom load balancer to co-locate the regions of two tables which are having
> same split keys
> --------------------------------------------------------------------------------------------
>
> Key: HBASE-10576
> URL: https://issues.apache.org/jira/browse/HBASE-10576
> Project: HBase
> Issue Type: Sub-task
> Components: Balancer
> Reporter: rajeshbabu
> Assignee: rajeshbabu
> Attachments: HBASE-10576.patch
>
>
> To support local indexing both user table and index table should have same
> split keys. This issue to provide custom balancer to colocate the regions of
> two tables which are having same split keys.
> This helps in Phoenix as well.
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