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  1. Documentation
  2. DOCS-13884

Investigate changes in SERVER-48742: Log whenever profiler settings are changed via setProfilingLevel



    • Task
    • Status: Closed
    • Major - P3
    • Resolution: Fixed
    • None
    • 4.7.0, 4.4.2, 4.0.22, 4.2.12
    • manual, Server
    • None
    • 3
    • ServerDocs2020: Feb9 - Feb16, ServerDocs2020: Feb16 - Feb23, ServerDocs2020: Feb23 - Mar2
    • true



      Downstream Change Summary

      We now log whenever the profile settings (level, slowms, sampleRate, filter) change at runtime (which happens via the profile command).

      Description of Linked Ticket

      We should add a log message, at log level 0, whenever the server's profiling settings are changed at run-time. The typical way you change these settings is via the setProfilingLevel shell helper: https://docs.mongodb.com/manual/reference/method/db.setProfilingLevel/index.html

      This will make it easier to understand log files. The server logs slow queries to the log file, using the profiling setting to decide what 'slow' means. For someone digging through a log file, and seeing the number of slow queries suddenly go up or down, it might be helpful to know whether that's because the workload changed or the profiling settings changed.

      Scope of changes

      Suggest updating https://docs.mongodb.com/manual/reference/command/profile/#behavior and https://docs.mongodb.com/manual/reference/method/db.setProfilingLevel/index.html to reflect this new behavior, along with the usual release notes update. There may be other places to doc this behavior, but those are the first pages which come to mind.

      Impact to Other Docs

      MVP (Work and Date)

      Resources (Scope or Design Docs, Invision, etc.)


        Issue Links



              jason.price@mongodb.com Jason Price
              backlog-server-pm Backlog - Core Eng Program Management Team
              Jess Mokrzecki Jess Mokrzecki
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                2 years, 4 weeks, 3 days ago