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Lars Hofhansl commented on HBASE-8316: -------------------------------------- Hmm... OK. Looked at the code. I buy that. Let's do that instead. > 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 > Components: Filters, Performance, regionserver > Reporter: Lars Hofhansl > Fix For: 0.98.0, 0.94.7, 0.95.1 > > Attachments: 8316-0.94.txt, 8316-trunk.txt > > > 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira