rabbah opened a new issue #3693: new invokers cause load balanacer to reallocate black box invokers URL: https://github.com/apache/incubator-openwhisk/issues/3693 The logic to update the set of managed and black box invokers will cause new invokers (when a sufficient number is added) to become black box invokers, and reallocates ones that were black box invokers as managed invokers. https://github.com/apache/incubator-openwhisk/blob/166189a8f15c99d9237e7020865a34c5bc92a0c2/core/controller/src/main/scala/whisk/core/loadBalancer/ShardingContainerPoolBalancer.scala#L422-L431 This can cause new invokers to re-pull images, and activations which might have been warn start on previous invokers now become cold starts. Updating this test https://github.com/apache/incubator-openwhisk/blob/f64722498bc2f5eadc356b3ae26ebb85de1bcdbf/tests/src/test/scala/whisk/core/loadBalancer/test/ShardingContainerPoolBalancerTests.scala#L45 ``` // apply third update, growing the state val update3 = IndexedSeq(healthy(0), healthy(1), healthy(2)) state.updateInvokers(update3) state.invokers shouldBe update3 state.managedInvokers shouldBe update3.dropRight(1) state.blackboxInvokers shouldBe IndexedSeq(update3.last) ``` shows the change in invoker sets. @markusthoemmes had a good suggestion in Slack which is better long term. I'll leave it to him to document in a future comment.
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