[
https://issues.apache.org/jira/browse/HBASE-1730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12737688#action_12737688
]
ryan rawson commented on HBASE-1730:
------------------------------------
lets decide on a serialization format to use within ZK, that is NOT hadoop
writables. I would vote for JSON since the data is small, and it would be nice
for it to be human readable without programmatic intervention.
> online schema updates
> ---------------------
>
> Key: HBASE-1730
> URL: https://issues.apache.org/jira/browse/HBASE-1730
> Project: Hadoop HBase
> Issue Type: Improvement
> Reporter: Andrew Purtell
> 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.
