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From "stack (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5494) Introduce a zk hosted table-wide read/write lock so only one table operation at a time
Date Wed, 29 Feb 2012 21:25:59 GMT
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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