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https://issues.apache.org/jira/browse/HBASE-4213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13104255#comment-13104255
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Subbu M Iyer commented on HBASE-4213:
-------------------------------------
Andrew, thanks for your comments.
In V8.
1. Axed all boolean based public API's from HBaseAdmin and HMAster.
2. Schema changes will now drive off the config param.
3. alter_instant removed.
4. We have new JIRA 4370 where we plan to address the Master/RS failover
scenarios in depth. So, we will probably address your new test case scenario
there. The current JIRA is to put a basic framework to support schema changes
through ZK in place.
Currently, when a RS dies halfway through the change the ZK node might stay on
for ever, although the schema changes would have been completed when the RS
comes back alive. This will be addressed intelligently in 4370 by stamping the
RS hostname in ZK and so on. (more details in 4370)
Hope this helps and let me know for any thing else.
thanks
Subbu
> 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.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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