[GitHub] leventov edited a comment on issue #7057: Make asynchronous emitters have the same (configurable?) policy when event queue is full

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leventov edited a comment on issue #7057: Make asynchronous emitters have the same (configurable?) policy when event queue is full
URL: https://github.com/apache/incubator-druid/issues/7057#issuecomment-463395385
 
 
   Yes, that was not very precise to call it "backpressure" policy, because we probably never want actual backpressure in metrics emitter, because metrics are relatively unimportant to slow down queries. Rephrased to "event throttling" policy. Simple policies might be "drop oldest" and "drop newest". Some more sophisticated policies may change the event "level" (like logging level) when the queue is full, like stop emitting some relatively less important kinds of events. (Probably trying to return to the default level after some backoff time or when the queue becomes sufficiently empty).

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