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https://issues.apache.org/jira/browse/HBASE-1886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12767395#action_12767395
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Andrew Purtell commented on HBASE-1886:
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bq. it's a new feature that changes stuff directly where we are the weakest eg
.META. scanner.
I have an internal customer who would like live attributes in 0.20 branch. I
hope we can work something out. Not sure what you mean about changing the META
scanner... I don't recall making any changes there.
bq. our patch relies on the SyncTableAttributes called every now and then to
sync the Master internal state with what clients may have changed in ZK
Only on shutdown presently.
bq. Thanks for starting work on this!
Thanks. It's definitely a work in progress. I'm hoping to have some time to
iterate on it this week and will address all of your comments. Thanks for
looking at the patch J-D!
> 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
> Assignee: Andrew Purtell
> Fix For: 0.20.2, 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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