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https://issues.apache.org/jira/browse/HBASE-4213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13088462#comment-13088462
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Subbu M Iyer commented on HBASE-4213:
-------------------------------------
Latest patch includes the following changes:
1. Load balancer will be turned off (if already enabled) before an instant
schema change operation.
2. Load balancer will be turned on (if was on before the instant schema change).
3. Added a ZK based check instead of sleep timer for couple of tests.
4. Master stores the number of online RS while creating the schema change node.
On completion the master compares against this count (rather than current
number of active RS which might have changed during the schema change
operation) with number of active RS to determine if all the RS have completed
the schema change operation.
> 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,
> HBASE_Instant_schema_change-version_3_.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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