Uploaded image for project: 'Couchbase Server'
  1. Couchbase Server
  2. MB-20521

query engine accounting information is generating unique keys causing ns_server to use & leak memory.

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Details

    • Bug
    • Status: Closed
    • Critical
    • Resolution: Fixed
    • 4.0.0, 4.1.0, 4.1.1, 4.1.2, 4.5.0
    • 4.5.1, 4.6.0, 5.0.0
    • query
    • Security Level: Public
    • None
    • Untriaged
    • No

    Description

      The leak happens in query stats collector. We expect a stable and finite set of stats from the cbq-engine. We cache some internal information on a per stat basis, so our memory usage is proportional to the number of stats returned by cbq-engine. In this particular case (and I was able to reproduce it easily), cbq-engine returns bunch of uniquely named stats, which results in ever growing memory consumption.
      Short excerpt of the kind of stats returned by the cbq-engine:

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       <<"updates.count">>]
      Most of these look like some garbage to me, so assigning to the query team.
      

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            marco.greco Marco Greco added a comment -

            fixed with changes 66756 and 66765

            marco.greco Marco Greco added a comment - fixed with changes 66756 and 66765

            Verified that the memory bloat observed as a result of this issue is resolved after running build 4.5.1-2817 for a week.

            matt.carabine Matt Carabine added a comment - Verified that the memory bloat observed as a result of this issue is resolved after running build 4.5.1-2817 for a week.

            Build 4.6.0-3318 contains query commit 7b304ddcca42e6b848e9ee26693d522f9ebd5142 with commit message:
            MB-20521 format statistic names avoiding fixed buffers
            https://github.com/couchbase/query/commit/7b304ddcca42e6b848e9ee26693d522f9ebd5142

            build-team Couchbase Build Team added a comment - Build 4.6.0-3318 contains query commit 7b304ddcca42e6b848e9ee26693d522f9ebd5142 with commit message: MB-20521 format statistic names avoiding fixed buffers https://github.com/couchbase/query/commit/7b304ddcca42e6b848e9ee26693d522f9ebd5142

            I'm I correct in believing 4.1.0 and 4.1.2 are also affected by this bug?

            pvarley Patrick Varley added a comment - I'm I correct in believing 4.1.0 and 4.1.2 are also affected by this bug?

            Reopen it quickly to update the affected versions.

            pvarley Patrick Varley added a comment - Reopen it quickly to update the affected versions.

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              marco.greco Marco Greco
              keshav Keshav Murthy
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