[jira] [Updated] (HBASE-10576) Custom load balancer to co-locate the regions of two tables which are having same split keys

["rajeshbabu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-10576?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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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