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From "Gregory Chanan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-7050) Document locking of HRegion
Date Thu, 25 Oct 2012 03:08:11 GMT
Gregory Chanan created HBASE-7050:

             Summary: Document locking of HRegion
                 Key: HBASE-7050
                 URL: https://issues.apache.org/jira/browse/HBASE-7050
             Project: HBase
          Issue Type: Task
          Components: documentation, Transactions/MVCC
            Reporter: Gregory Chanan
            Priority: Minor

Would be good to have some documentation on the locking in HRegion.  In particular, the updateLock
and the row locks.

With the optimizations that have been made, e.g. HBASE-5541 this isn't straightforward.

When do these locks need to be held?  What structures do they protect access to?  Why does
the updateLock not need to be held during rollback?  Those sorts of questions.

I've started do to some of this, but haven't fully fleshed it out.

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