[ https://issues.apache.org/jira/browse/IMPALA-7271?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Lars Volker resolved IMPALA-7271. --------------------------------- Resolution: Fixed Fix Version/s: Impala 3.1.0 Resolved as part of IMPALA-7006 > KRPC: cross-port caching of GetLoggedInUser > ------------------------------------------- > > Key: IMPALA-7271 > URL: https://issues.apache.org/jira/browse/IMPALA-7271 > Project: IMPALA > Issue Type: Bug > Components: Backend > Affects Versions: Impala 2.12.0 > Reporter: Todd Lipcon > Assignee: Lars Volker > Priority: Major > Fix For: Impala 3.1.0 > > > In a production cluster I am seeing a high rate of 'mmap' calls under a > workload which starts and stops a lot of exchanges. These are causing a lot > contention for the mmap semaphore, which is then causing page faults to be > rather slow. By running perf record -e syscalls:*mmap I can see that most of > the calls are coming from KRPC's call to GetLoggedInUser when initting a > Proxy object. This was fixed by https://gerrit.cloudera.org/#/c/9895/ which > needs to be cherry-picked over. -- This message was sent by Atlassian JIRA (v7.6.3#76005)