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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 17:31:59 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12767398#action_12767398
] 

Jonathan Gray commented on HBASE-1886:
--------------------------------------

One other thing.  We might bump families into their own node under the table.  I expect we
will have other things we'd like to publish into ZK on a per-table basis (and probably per-family),
like load, status, whatever.

{noformat}
/hbase
  /table
    /<table-name>
      /families/<family-name>
      /load({'json':'load info'})
{noformat}
  

> 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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