[HBASE-1886] move table and column family attributes to ZK to make them live

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Duplicate
• Fix Version/s: 0.90.0
• Assignee: Andrew Kyle Purtell
• Reporter: Andrew Kyle Purtell
• Created: 05/Oct/09 02:11
• Updated: 20/Nov/15 13:01
• Resolved: 23/Oct/09 22:41

Description

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:

/hbase
  /table
    /<table-name>
      /attr
        /<table-attr-name>
        /<family-name>
          /<family-attr-name>

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.