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stack commented on HBASE-5898: ------------------------------ [~lhofhansl] Can we make a new issue w/ your important finding? Need to fix. Do something like "...adhoc fix where attempt seek + read and if the istream is locked we'll switch to pread. That way we get seek + read when possible and pread when necessary." Its pretty critical I'd say. Opening a pool of readers would be a PITA. > Consider double-checked locking for block cache lock > ---------------------------------------------------- > > Key: HBASE-5898 > URL: https://issues.apache.org/jira/browse/HBASE-5898 > Project: HBase > Issue Type: Improvement > Components: Performance > Affects Versions: 0.94.1 > Reporter: Todd Lipcon > Assignee: Todd Lipcon > Priority: Critical > Fix For: 0.94.3, 0.96.0 > > Attachments: 5898-0.94.txt, 5898-TestBlocksRead.txt, 5898-v2.txt, > 5898-v3.txt, 5898-v4.txt, 5898-v4.txt, HBASE-5898-0.patch, > HBASE-5898-1.patch, HBASE-5898-1.patch, hbase-5898.txt > > > Running a workload with a high query rate against a dataset that fits in > cache, I saw a lot of CPU being used in IdLock.getLockEntry, being called by > HFileReaderV2.readBlock. Even though it was all cache hits, it was wasting a > lot of CPU doing lock management here. I wrote a quick patch to switch to a > double-checked locking and it improved throughput substantially for this > workload. -- 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