Lars Hofhansl created HBASE-8316:
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Summary: JoinedHeap for essential column families should reseek
instead of seek
Key: HBASE-8316
URL: https://issues.apache.org/jira/browse/HBASE-8316
Project: HBase
Issue Type: Sub-task
Reporter: Lars Hofhansl
Fix For: 0.98.0, 0.94.7, 0.95.1
This was raised by the Phoenix team. During a profiling session we noticed that
catching the joinedHeap up to the current rows via seek causes a performance
regression, which makes the joinedHeap only efficient when either a high or low
percentage is matched by the filter.
(High is fine, because the joinedHeap will not get behind as often and does not
need to be caught up, low is fine, because the seek isn't happening frequently).
In our tests we found that the solution is quite simple: Replace seek with
reseek. Patch coming soon.
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