cdsbalancer: test cleanup part 3/N #6564
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easwars
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Overall comment on this file: I like how you rewrote the tests to expect a child config to the cluster_resolver corresponding to the leaf clusters. However, I feel like by switching the tests over we drop a lot of the functionality wrt the cds balancer not sending an update yet due to the aggregate cluster graph not being filled yet (i.e. all the roots). You have a case for this from A->A not sending but drop a lot of the verifications that it doesn't send in many tests. Maybe add them by only adding management server resources for different clusters when needed, and have assertions it doesn't send before adding the management server resources for a specific cluster (instead of filling out the full tree at the beginning of the test).
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A specific example of a dropped assertion: https://github.com/grpc/grpc-go/pull/6564/files#diff-6eccd90237cb4345aac6d80e2e740c5d686f42cab9799b3eaf261e392785af54L288. I think these checks are important, but luckily we can plumb it into the e2e style way as well :).
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I've added this check to the following tests:
TestAggregateClusterSuccess_ThenUpdateChildClustersTestAggregatedClusterSuccess_DiamondDependencyTestAggregatedClusterSuccess_IgnoreDups
The first one checks the base case for aggregate clusters, while the next two test some other interesting cases.
| // This shouldn't cause an update to be written to the update buffer, | ||
| // as cluster C has not received a cluster update yet. |
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Another example of a scenario that is lost. This is a corner case but is important because cluster C gets a callback which is unknown before specifying the same D, and tests the flip from this aggregate cluster is ready to update since the whole tree has updates (including both B and C's children) vs. it's not yet ready.
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Specifically, tests this complicated algorithm/data structure of clusters seen: https://github.com/grpc/grpc-go/blob/master/xds/internal/balancer/cdsbalancer/cluster_handler.go#L215.
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@zasweq : Had to force push since I had to rebase to master. |
| mgmtServer, nodeID, _, _, _, _, _ := setupWithManagementServer(t) | ||
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| // Configure the management server with the aggregate cluster resource | ||
| // pointing to two child clusters. But don't include resource corresponding |
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Specify the child clusters, and mention you include EDS cluster. Applies to all aggregate cluster comments added in commit 3 explaining not send update yet.
| // Tests the case where the cluster resource requested by the cds LB policy is | ||
| // an aggregate cluster root pointing to two child clusters, one of type EDS and | ||
| // the other of type LogicalDNS. Verifies that the load balancing configuration | ||
| // pushed to the cluster_resolver LB policy is as expected. The test then | ||
| // updates the aggregate cluster to point to two child clusters, the same leaf | ||
| // cluster of type EDS and a different leaf cluster of type LogicalDNS and | ||
| // verifies that the load balancing configuration pushed to the cluster_resolver | ||
| // LB policy contains the expected discovery mechanisms corresponding to the | ||
| // child clusters. |
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For cases where you added no cluster update sent verification, please add that to top level testing comments.
This PR cleans up aggregate cluster tests in the cds LB policy. It makes the tests verify behavior rather than internal state. Cleaning up these tests helped identify the issue described in #6562.
#resource-agnostic-xdsclient-api
RELEASE NOTES: none