Introduce a zk hosted table-wide read/write lock so only one table operation at
a time
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Key: HBASE-5494
URL: https://issues.apache.org/jira/browse/HBASE-5494
Project: HBase
Issue Type: Improvement
Reporter: stack
I saw this facility over in the accumulo code base.
Currently we just try to sort out the mess when splits come in during an online
schema edit; somehow we figure we can figure all possible region transition
combinations and make the right call.
We could try and narrow the number of combinations by taking out a zk table
lock when doing table operations.
For example, on split or merge, we could take a read-only lock meaning the
table can't be disabled while these are running.
We could then take a write only lock if we want to ensure the table doesn't
change while disabling or enabling process is happening.
Shouldn't be too hard to add.
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