[ https://issues.apache.org/jira/browse/KUDU-2381?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Todd Lipcon resolved KUDU-2381. ------------------------------- Resolution: Fixed Fix Version/s: 1.11.0 > Optimize DeltaMemStore for case of no matching deltas > ----------------------------------------------------- > > Key: KUDU-2381 > URL: https://issues.apache.org/jira/browse/KUDU-2381 > Project: Kudu > Issue Type: Improvement > Components: perf, tablet > Reporter: Todd Lipcon > Assignee: ZhangYao > Priority: Major > Fix For: 1.11.0 > > > Currently in a scan workload which scans 280 columns I see DeltaMemStore > iteration taking up a significant amount of CPU in the scan, despite the fact > that the dataset has no updates. Of 1.6sec in > MaterializingIterator::NextBlock, we spent 0.61s in DMSIterator::PrepareBatch > and 0.14s in DMSIterator::MayHaveDeltas. So, about 46% of our time here is on > wasted work. -- This message was sent by Atlassian JIRA (v7.6.3#76005)