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https://issues.apache.org/jira/browse/HBASE-4213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13106776#comment-13106776
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Subbu M Iyer commented on HBASE-4213:
-------------------------------------
In addition to most of the review comments, V9 adds:
1. Handle cases when the table is not in enabled state.
2. Ensures that concurrent alter requests are not missed.
3. Validate that alter can survive cases when one of the RS goes down during
alter, or multiple RS going down during alter or adding new RS servers to the
cloud during an alter.
4. Handle cases when primary master is brought down during alter and secondary
takes over.
5. Added new test cases for all of the above mentioned cases.
To-Do:
1. Revisit the load balancer toggling. It doesn't seem right.
2. Add monitoring support for alter process.
3. Gracefully handle cases when ZooKeeper throws exceptions during an alter.
4. Add fine grained tests to validate master failover cases.
5. Address any other comments/suggestions.
> Support for fault tolerant, instant schema updates with out master's
> intervention (i.e with out enable/disable and bulk assign/unassign) through
> ZK.
> ----------------------------------------------------------------------------------------------------------------------------------------------------
>
> 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: 4213-Instant_Schema_change_through_ZK.patch,
> 4213-V5-Support_instant_schema_changes_through_ZK.patch,
> 4213-V7-Support_instant_schema_changes_through_ZK.patch,
> 4213-V8-Support_instant_schema_changes_through_ZK.patch,
> 4213-V9-Support_instant_schema_changes_through_ZK.patch, 4213.v6,
> 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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