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https://issues.apache.org/jira/browse/HBASE-4213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13087521#comment-13087521
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Ted Yu commented on HBASE-4213:
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I think load balancer should be temporarily disabled at the beginning of
instant schema change.
At the end, balancer should be enabled.
We should perform some testing on a table which has over 400 regions to see how
long it takes for a cluster under normal load.
If it is not too long, disabling balancer should be fine.
> Support instant schema updates with out master's intervention (i.e with out
> enable/disable and bulk assign/unassign)
> --------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-4213
> URL: https://issues.apache.org/jira/browse/HBASE-4213
> Project: HBase
> Issue Type: Improvement
> Reporter: Subbu M Iyer
> Assignee: Subbu M Iyer
> Fix For: 0.92.0
>
> Attachments: HBASE-4213-Instant_schema_change.patch,
> HBASE-4213_Instant_schema_change_-Version_2_.patch
>
>
> This Jira is a slight variation in approach to what is being done as part of
> https://issues.apache.org/jira/browse/HBASE-1730
> Support instant schema updates such as Modify Table, Add Column, Modify
> Column operations:
> 1. With out enable/disabling the table.
> 2. With out bulk unassign/assign of regions.
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