[ https://issues.apache.org/jira/browse/KUDU-1977?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Todd Lipcon resolved KUDU-1977. ------------------------------- Resolution: Fixed Fix Version/s: 1.8.0 Fixed in b2b8fb74dc564b5e55af6406982e80f2efa19f3c > MetaCache cache hits should avoid ref count incr/decr > ----------------------------------------------------- > > Key: KUDU-1977 > URL: https://issues.apache.org/jira/browse/KUDU-1977 > Project: Kudu > Issue Type: Improvement > Components: client, perf > Affects Versions: 1.3.0 > Reporter: Todd Lipcon > Assignee: Todd Lipcon > Priority: Major > Fix For: 1.8.0 > > > Looking at CPU consumption of a client using perf tools (including the new > perf-c2c tool) I see that metacache hits in multi-threaded writers are rather > slow because of the reference count increments and decrements on the > MetaCache object. > In the case of the cache hit, there's no real need to allocate the LookupRpc > object, increment ref counts, and then decrement them. Instead we could move > the fast-path check out of LookupRpc and save some CPU. -- This message was sent by Atlassian JIRA (v7.6.3#76005)