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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-1730) Near-instantaneous online schema and table state updates
Date Fri, 30 Oct 2009 23:56:59 GMT

     [ 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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