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https://issues.apache.org/jira/browse/IMPALA-7271?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lars Volker resolved IMPALA-7271.
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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.
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