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Posted to dev@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2016/04/26 23:06:12 UTC

[jira] [Created] (HBASE-15716) HRegion#RegionScannerImpl scannerReadPoints synchronization costs

stack created HBASE-15716:
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             Summary: HRegion#RegionScannerImpl scannerReadPoints synchronization costs
                 Key: HBASE-15716
                 URL: https://issues.apache.org/jira/browse/HBASE-15716
             Project: HBase
          Issue Type: Bug
          Components: Performance
            Reporter: stack


Here is a [~lhofhansl] special.

When we construct the region scanner, we get our read point and then store it with the scanner instance in a Region scoped CSLM. This is done under a synchronize on the CSLM.

This synchronize on a region-scoped Map creating region scanners is the outstanding point of lock contention according to flight recorder (My work load is workload c, random reads).





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