A61 update: fix ring_hash proactive connection attempt logic#475
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dfawley
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ejona86
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I do think talking so much about priority makes things overly complicated. CONNECTING has always implied "the LB policy is connecting." And since we adopted sticky-TF everywhere, TF also implies "the LB policy is connecting (with backoff)". But I understand why priority is being discussed; it just is unfortunate it is being discussed so much.
This was referenced Feb 17, 2025
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See grpc/proposal#475 for details. While I was at it, I greatly simplified the logic, avoiding an unnecessary duplicate loop over all endpoints that we didn't need to be doing. I removed an unnecessary end2end test that was broken by this change. That test actually should have broken when I first changed ring_hash to delegate to pick_first back in #34244, and I'm not sure why it didn't. But it definitely broke here when I changed the logic to not choose endpoints in any specific order when triggering connection attempts, and since the test was really intended to test a behavior that we no longer guarantee, I removed it. In its place, I added a unit test that shows the new behavior in a much clearer way. (Originally, we didn't have a good way to write unit tests for LB policies, so all of our tests were written as e2e tests. Now that we do have a good framework for unit tests, we've been slowly finding e2e tests that really should be unit tests instead, and moving them over when we find them.) Closes #38741 COPYBARA_INTEGRATE_REVIEW=#38741 from markdroth:ring_hash_tf_and_connecting_fix 6c4c773 PiperOrigin-RevId: 728255272
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See grpc/proposal#475 for details. While I was at it, I greatly simplified the logic, avoiding an unnecessary duplicate loop over all endpoints that we didn't need to be doing. I removed an unnecessary end2end test that was broken by this change. That test actually should have broken when I first changed ring_hash to delegate to pick_first back in grpc#34244, and I'm not sure why it didn't. But it definitely broke here when I changed the logic to not choose endpoints in any specific order when triggering connection attempts, and since the test was really intended to test a behavior that we no longer guarantee, I removed it. In its place, I added a unit test that shows the new behavior in a much clearer way. (Originally, we didn't have a good way to write unit tests for LB policies, so all of our tests were written as e2e tests. Now that we do have a good framework for unit tests, we've been slowly finding e2e tests that really should be unit tests instead, and moving them over when we find them.) Closes grpc#38741 COPYBARA_INTEGRATE_REVIEW=grpc#38741 from markdroth:ring_hash_tf_and_connecting_fix 6c4c773 PiperOrigin-RevId: 728255272
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Fix logic for ring_hash proactive connection attempts to trigger even if the state update was not triggered by an endpoint entering TRANSIENT_FAILURE state. This addresses two edge cases spotted by @arjan-bal: