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Posted to issues-all@impala.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2018/07/10 00:51:00 UTC

[jira] [Created] (IMPALA-7271) KRPC: cross-port caching of GetLoggedInUser

Todd Lipcon created IMPALA-7271:
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             Summary: 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


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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