• fix: change enqueue error to debug log level #19686 👈(View in Graphite)
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I don't think it is simple coincidence that we started seeing failures. Still, I'm confident it's benign. Each mapper runs in a goroutine that selects work to do or context cancellation. When a peer disconnects we cancel the context and close the ConnIO. There is a race between work in progress and cancellation.

As the test suite changes the timing of different things in goroutines can shift around for reasons unrelated to the test whose outcome changes. This flaky logging condition was always there, but for whatever reason we didn't hit it in our test suite until recently.