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https://issues.apache.org/jira/browse/HBASE-1886?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Purtell updated HBASE-1886:
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Attachment: live_attributes.patch
> move table and column family attributes to ZK to make them live
> ---------------------------------------------------------------
>
> Key: HBASE-1886
> URL: https://issues.apache.org/jira/browse/HBASE-1886
> Project: Hadoop HBase
> Issue Type: Improvement
> Reporter: Andrew Purtell
> Fix For: 0.21.0
>
> Attachments: live_attributes.patch
>
>
> This is a first cut at moving table and column family attributes up to ZK
> where they can be modified any time without requiring a disable/enable table
> cycle. Adds methods to ZooKeeperWrapper for support server side. Adds methods
> to HTableInterface for client side access. Client side talks directly to ZK.
> The new hierarchy for attributes in ZK is like:
> {noformat}
> /hbase
> /table
> /<table-name>
> /attr
> /<table-attr-name>
> /<family-name>
> /<family-attr-name>
> {noformat}
> As before attribute names and values are byte[], but now that they are hosted
> in ZK, the path delimiter ('/') cannot be used.
> Attached patch compiles but has not been tested. I put it up for a concept
> review. Next step before this is functional is to deprecate the attribute
> related methods on HTD and HCD and chase through the warnings to find all
> users who should be updated to use the ZK wrapper or new HTable methods
> instead. And, of course, then add test cases that successfully complete.
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