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https://issues.apache.org/jira/browse/HBASE-1730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12737689#action_12737689
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Andrew Purtell commented on HBASE-1730:
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+1 on all of Ryan's points.
> online schema updates
> ---------------------
>
> Key: HBASE-1730
> URL: https://issues.apache.org/jira/browse/HBASE-1730
> Project: Hadoop HBase
> Issue Type: Improvement
> Reporter: Andrew Purtell
> Fix For: 0.21.0
>
>
> We should not need to take a table offline to update HCD or HTD.
> One option for that is putting HTDs and HCDs up into ZK, with mirror on disk
> catalog tables to be used only for cold init scenarios, as discussed on IRC.
> In this scheme, regionservers hosting regions of a table would watch
> permanent nodes in ZK associated with that table for schema updates and take
> appropriate actions out of the watcher. In effect, schema updates become
> another item in the ToDo list.
> {{/hbase/tables/<table-name>/schema}}
> Must be associated with a write locking scheme also handled with ZK
> primitives to avoid situations where one concurrent update clobbers another.
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