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  1. Moodle
  2. MDL-71768

More tuning of the redis session handler to reduce blocking wait time

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    • Icon: Improvement Improvement
    • Resolution: Unresolved
    • Icon: Minor Minor
    • None
    • Future Dev
    • Authentication, Performance
    • None

      A follow on from MDL-68577

      We've hit a couple clients who have very large courses with hundreds of requests. These inevitably pile up and as soon as the page takes more than 5 seconds then each requests hits the hard coded limit and their session polling gets throttled back to once a second which means the images load roughly once a second each and block each other.

      I'm not sure what to do here, the bottle next is really elsewhere and anything done here is a bandaid. However it could help things if when the 5 seconds is hit it slowly thottles back instead of a hard jump to every second. The original intention of the throttling was to avoid events which cause slowness from escalating and I want to retain that functionality.

      So proposing something like we hit 5 seconds and then every poll after that we slowly ramp up the poll delay by 10% until we hit some cap.

       

            Unassigned Unassigned
            brendanheywood Brendan Heywood
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