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Date: Fri, 30 Oct 2009 23:56:59 +0000 (UTC)
From: "stack (JIRA)" <jira@apache.org>
To: hbase-dev@hadoop.apache.org
Subject: [jira] Updated: (HBASE-1730) Near-instantaneous online schema and
 table state updates
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     [ https://issues.apache.org/jira/browse/HBASE-1730?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack updated HBASE-1730:
-------------------------

    Attachment: 1730.patch

Started in on HCD.  Added test for new serialization.  Depends on jackson 1.0.1.  Long way from finished.

This work might have us move from ruby map representations to JSON in UI, shell and in znode.  Will see.  Shouldn't be prob. really since HRegionInfo will no longer be shown in shell as much since it will no longer be in .META. when this work is done.

> 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.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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