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From "Subbu M Iyer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-1730) Near-instantaneous online schema and table state updates
Date Sat, 27 Aug 2011 02:27:42 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13092168#comment-13092168
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Subbu M Iyer commented on HBASE-1730:
-------------------------------------

Nilemma/Nicholas,

Are you (or some one) already working on incorporating the required changes from 4213 to trunk
after your patch is applied?

I would like to work on it as I already have most of the required changes, but would not want
to step into your shoes if some one on your side is already working on it.

Please let me know.

> Near-instantaneous online schema and table state updates
> --------------------------------------------------------
>
>                 Key: HBASE-1730
>                 URL: https://issues.apache.org/jira/browse/HBASE-1730
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Andrew Purtell
>            Assignee: stack
>            Priority: Critical
>             Fix For: 0.92.0
>
>         Attachments: 1730-v2.patch, 1730-v3.patch, 1730.patch, HBASE-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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