[jira] Commented: (HBASE-1730) Near-instantaneous online schema and table state updates

["Jean-Daniel Cryans (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-1730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12772368#action_12772368 ] 

Jean-Daniel Cryans commented on HBASE-1730:
-------------------------------------------

Looking good! I like how we get rid of all the doubled stuff because we had to maintain a string and a writable.

> Near-instantaneous online schema and table state updates
> --------------------------------------------------------
>
>                 Key: HBASE-1730
>                 URL: https://issues.apache.org/jira/browse/HBASE-1730
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: Andrew Purtell
>            Assignee: stack
>             Fix For: 0.21.0
>
>         Attachments: 1730-v2.patch, 1730.patch
>
>
> 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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