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  1. WiredTiger
  2. WT-3937

Tune lookaside sweep to react to workload

    • Type: Icon: Improvement Improvement
    • Resolution: Fixed
    • Priority: Icon: Major - P3 Major - P3
    • 3.6.6, 4.0.0-rc0, WT3.1.0
    • Affects Version/s: None
    • Component/s: None
    • None
    • Storage Non-NYC 2018-04-09, Storage Non-NYC 2018-04-23, Storage Non-NYC 2018-05-07

      In WT-3766, bruce.lucas commented:

      I ran an insert workload and induced some replica set lag to create cache pressure. In about 5 minutes of running it generated about 2 billion lookaside table entries, for a LAS file size of about 1.2. GB (highly compressible data; would be much larger for more typical data).

      In 3.6.3 I can see 10 k lookaside table removes every 10 seconds - is that the expected effect of this change? At that rate it will take about 3 weeks to get rid of the lookaside table entries that took 5 minutes to generate, so I'm wondering about the efficacy of this; maybe it needs some tuning?

            sue.loverso@mongodb.com Susan LoVerso
            michael.cahill@mongodb.com Michael Cahill (Inactive)
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