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Support for FailMasterPromotionOnLagMinutes#1115
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shlomi-noach merged 22 commits intomasterfrom May 2, 2020
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thanks for the mention @shlomi-noach! I will be testing it out! |
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Behavior of this change is now validated via the (new) system tests framework: |
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Fixes #83
Scenario:
M -> Rtopology was running with replicaRbroken for a few hours without anyone noticing. Then, masterMfails.Curent behavior:
orchestratorpromotesR. But by this we lose:Rbut not executed (e.g. because of some SQL error), orM.New config variable
FailMasterPromotionOnLagMinutestellsorchestratorto fail a promotion if, at the time a candidate replica is chosen, it is determined to be lagging too much ( >=FailMasterPromotionOnLagMinutes).cc @sougou @mcrauwel