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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