move table and column family attributes to ZK to make them live
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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
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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