@Override
        public void onCompleted() {
            latch.countDown();
        }
A {@link Benchmark} to check performance of armeria-grpc with large payloads in the megabytes, which is
a relatively common use case for a binary proxy (metadata + large binary blobs).
benchmarks/jmh/src/jmh/java/com/linecorp/armeria/grpc/downstream/LargePayloadBenchmark.java