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https://issues.apache.org/jira/browse/HBASE-2459?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack resolved HBASE-2459.
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Resolution: Won't Fix
Context is different now. Resolving as won't fix.
> Use finer-grain locking in HConnectionManager
> ---------------------------------------------
>
> Key: HBASE-2459
> URL: https://issues.apache.org/jira/browse/HBASE-2459
> Project: HBase
> Issue Type: Improvement
> Components: Client
> Reporter: Jonathan Gray
> Priority: Minor
> Labels: moved_from_0_20_5, noob
>
> Currently we synchronize within HConnectionManager.locateRegionInMeta() when
> looking up the cached location (and querying meta if not cached). We use the
> same lock for every user-space region.
> We really only need per-region synchronization here.
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