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https://issues.apache.org/jira/browse/HBASE-7050?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell resolved HBASE-7050.
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Resolution: Not A Problem
> 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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