Lars Hofhansl created HBASE-10117:
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Summary: Avoid synchronization in HRegionScannerImpl.isFilterDone
Key: HBASE-10117
URL: https://issues.apache.org/jira/browse/HBASE-10117
Project: HBase
Issue Type: Bug
Components: Performance
Reporter: Lars Hofhansl
Fix For: 0.94.15, 0.96.2, 0.98.1
A while ago I introduced HRegoinScannerImpl.nextRaw() to allow coprocessors and
scanners with caching > 1 to avoid repeated synchronization during the scanning
(which puts up memory fences, which in turns slows things down on multi core
machines).
Looking at the code again I see that isFilterDone() is called from nextRaw()
and isFilterDone() is synchronized. isFilterDone() is only called from two
places. The other place is rare in RegionServer.next() when we're bypassing at
the request of a coprocessor. We can add synchronization there.
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