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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1886) move table and column family attributes to ZK to make them live
Date Mon, 19 Oct 2009 18:13:59 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12767432#action_12767432

Jonathan Gray commented on HBASE-1886:

I have a few reasons for not wanting this part of branch, though I understand you needing
it for internal use.
- This is not a standalone issue... the design of this should be part of the larger master
redesign / increased usage of ZK (create/enable/disable tables, region assignment, load balancing,
- Putting this into branch while also moving forward with more changes for trunk could mean
a fork in ZK usage between the two
- And strictly speaking, this is a major change, not a major bug, and really doesn't belong
in a minor revision

I'd like to expand this conversation to be about all the stuff we want to move into ZK, how
we will design our usage of ZK, etc... rather than focusing on this single change.

On the other hand, we haven't had much work done in trunk around this stuff... this could
be a good first step.  I just don't want to tie our hands or limit our thinking because we
want to put this into branch.

> 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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