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Posted to dev@hbase.apache.org by "Vladimir Rodionov (JIRA)" <ji...@apache.org> on 2014/09/12 21:07:34 UTC

[jira] [Created] (HBASE-11965) Optimize locking in HRegion

Vladimir Rodionov created HBASE-11965:
-----------------------------------------

             Summary: Optimize locking in HRegion
                 Key: HBASE-11965
                 URL: https://issues.apache.org/jira/browse/HBASE-11965
             Project: HBase
          Issue Type: Bug
          Components: Performance
            Reporter: Vladimir Rodionov
            Assignee: Vladimir Rodionov


Described in this thread:

http://mail-archives.apache.org/mod_mbox/hbase-dev/201409.mbox/%3CCAAg3a2qmWJtQbdAk7PrX%2BW8SZWxsYhNggM5f2RNkGTXUri34YQ%40mail.gmail.com%3E

*startRegionOperation* and *closeRegionOperation* in HRegion acquires and releases region-wide lock. The locking happens for every mutation, read and scan next. This is a serious bottleneck if we do:

* Mutli - get on a same region.
* Run multiple scanners on same region.
* Do scan during compaction.
* Access region simultaneously from different threads (most generic case)



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