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  1. IMPALA
  2. IMPALA-7271

KRPC: cross-port caching of GetLoggedInUser

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Details

    • Bug
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • Impala 2.12.0
    • Impala 3.1.0
    • Backend
    • None
    • ghx-label-6

    Description

      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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            lv Lars Volker
            tlipcon Todd Lipcon
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