xds: Fix XDS control plane client retry timer backoff duration when connection closes after results are received#11766
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larry-safran merged 2 commits intogrpc:masterfrom Dec 19, 2024
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It appears this is using the connection-style backoff, which does indeed start the timer at the start of the previous attempt. https://github.com/grpc/grpc/blob/master/doc/connection-backoff.md#proposed-backoff-algorithm |
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Nit: include |
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And in this case the title should also say "xds client" in some fashion. The title is not clear as-is. |
…he delay calculation logic.
larry-safran
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ejona86
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Dec 19, 2024
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danielzhaotongliu
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Dec 19, 2024
| // Reset the backoff sequence if had received a response, or backoff sequence | ||
| // has never been initialized. | ||
| retryBackoffPolicy = backoffPolicyProvider.get(); | ||
| stopwatch.reset(); |
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Quick question for my understanding, StopWatch itself is not a thread-safe class and requires external synchronization, but in the control plane client it is thread safe because we run it in the synchronization context?
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Yes. We rely heavily on synchronization context.
larry-safran
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The backoffPolicy was calculating time since last attempt, but if the stream had been successfully connected and received responses it should delay from the current time (i.e. reset the stopwatch). Changed test so that stopwatch wasn't always 0, which masked the problem.