online schema updates
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Key: HBASE-1730
URL: https://issues.apache.org/jira/browse/HBASE-1730
Project: Hadoop HBase
Issue Type: Improvement
Reporter: Andrew Purtell
Fix For: 0.21.0
We should not need to take a table offline to update HCD or HTD.
One option for that is putting HTDs and HCDs up into ZK, with mirror on disk
catalog tables to be used only for cold init scenarios, as discussed on IRC. In
this scheme, regionservers hosting regions of a table would watch permanent
nodes in ZK associated with that table for schema updates and take appropriate
actions out of the watcher. In effect, schema updates become another item in
the ToDo list.
{{/hbase/tables/<table-name>/schema}}
Must be associated with a write locking scheme also handled with ZK primitives
to avoid situations where one concurrent update clobbers another.
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