hbase-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "ryan rawson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1730) online schema and tableAdd updates
Date Thu, 29 Oct 2009 23:51:59 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12771703#action_12771703

ryan rawson commented on HBASE-1730:

while we are thinking about this, i'd like to be able to do:

- add new CF 
- remove existing CF
- change compression
- change other things

without taking a table offline. that would be some killer features right there!

> online schema and tableAdd 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
> 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. 

This message is automatically generated by JIRA.
You can reply to this email to add a comment to the issue online.

View raw message