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Previously, etcd wrote to stderr in JSON format:
{"level":"warn","ts":"2025-04-11T03:32:06.676527Z","caller":"embed/config.go:689","msg":"Running http and grpc server on single port. This is not recommended for production."}
{"level":"warn","ts":"2025-04-11T03:32:06.676707Z","caller":"embed/config.go:689","msg":"Running http and grpc server on single port. This is not recommended for production."}
{"level":"warn","ts":"2025-04-11T03:32:06.677056Z","caller":"etcdmain/etcd.go:146","msg":"failed to start etcd","error":"listen tcp 127.0.0.1:37803: bind: address already in use"}
{"level":"fatal","ts":"2025-04-11T03:32:06.677104Z","caller":"etcdmain/etcd.go:204","msg":"discovery failed","error":"listen tcp 127.0.0.1:37803: bind: address already in use","stacktrace":"go.etcd.io/etcd/server/v3/etcdmain.startEtcdOrProxyV2\n\tgo.etcd.io/etcd/server/v3/etcdmain/etcd.go:204\ngo.etcd.io/etcd/server/v3/etcdmain.Main\n\tgo.etcd.io/etcd/server/v3/etcdmain/main.go:40\nmain.main\n\tgo.etcd.io/etcd/server/v3/main.go:31\nruntime.main\n\truntime/proc.go:272"}
This has several drawbacks:
- Not very readable.
- When used in tests which start etcd themselves (for example, scheduler_perf),
the output is not associated with the current test.
- Contains warnings that are confusing for developers who don't know that they
are harmless.
Intercepting output, parsing it and reformating makes the output nicer. Instead
of a mixture of JSON messages (see above) and normal test output, we now get
the etcd output embedded inside the test output. We can also filter out some
known harmless messages. Cleaning up more output or avoiding it in the first
place might be a good next step.
With `go test -v ./test/integration/scheduler_perf/dra`:
=== RUN TestSchedulerPerf
=== RUN TestSchedulerPerf/SchedulingWithResourceClaimTemplate
=== RUN TestSchedulerPerf/SchedulingWithResourceClaimTemplate/fast
I0411 13:21:03.353458 65212 feature_gate.go:385] feature gates: {map[SchedulerQueueingHints:false]}
...
I0411 13:21:10.552975 65212 cidrallocator.go:210] stopping ServiceCIDR Allocator Controller
I0411 13:21:10.567327 65212 etcd.go:210] "etcd output" logger="TestSchedulerPerf/SchedulingWithResourceClaimTemplate/fast" error="accept tcp 127.0.0.1:42245: use of closed network connection" level="warn" ts="2025-04-11T13:21:10.567045+0200" caller="embed/serve.go:160" msg="stopping insecure grpc server due to error"
I0411 13:21:10.567398 65212 etcd.go:210] "etcd output" logger="TestSchedulerPerf/SchedulingWithResourceClaimTemplate/fast" ts="2025-04-11T13:21:10.567198+0200" caller="embed/serve.go:162" msg="stopped insecure grpc server due to error" error="accept tcp 127.0.0.1:42245: use of closed network connection" level="warn"
I0411 13:21:15.567917 65212 etcd.go:227] "etcd didn't exit in 5 seconds, killing it" logger="TestSchedulerPerf/SchedulingWithResourceClaimTemplate/fast"
I0411 13:21:15.567964 65212 etcd.go:234] "etcd exited" logger="TestSchedulerPerf/SchedulingWithResourceClaimTemplate/fast" err="signal: terminated"
With per-test output `go test -v ./test/integration/scheduler_perf/dra -args -use-testing-log`:
=== RUN TestSchedulerPerf
=== RUN TestSchedulerPerf/SchedulingWithResourceClaimTemplate
=== RUN TestSchedulerPerf/SchedulingWithResourceClaimTemplate/fast
I0411 13:19:03.540497 28645 feature_gate.go:385] feature gates: {map[DynamicResourceAllocation:true]}
...
I0411 13:19:10.519994 28645 cidrallocator.go:210] stopping ServiceCIDR Allocator Controller
etcd.go:210: I0411 13:19:10.533131] etcd output msg="stopping insecure grpc server due to error" error="accept tcp 127.0.0.1:46637: use of closed network connection" level="warn" ts="2025-04-11T13:19:10.532900+0200" caller="embed/serve.go:160"
etcd.go:210: I0411 13:19:10.533274] etcd output msg="stopped insecure grpc server due to error" error="accept tcp 127.0.0.1:46637: use of closed network connection" level="warn" ts="2025-04-11T13:19:10.533022+0200" caller="embed/serve.go:162"
etcd.go:227: I0411 13:19:15.533715] etcd didn't exit in 5 seconds, killing it
etcd.go:234: I0411 13:19:15.533803] etcd exited err="signal: terminated"