Another question is whether this is the same the second time you create a
channel. The first time, the JVM may be taking time doing class loading.
On Tue, Aug 22, 2023 at 8:41 AM 'Yuri Golobokov' via grpc.io <
grpc-io@googlegroups.com> wrote:
> Hello,
> What is the round-trip time? How much time does DNS resolution take?
>
> On Tuesday, August 22, 2023 at 12:02:21 AM UTC-7 邹会江 wrote:
>
>> ### JAVA Code
>>
>> ```
>> channel =
>> ManagedChannelBuilder.forTarget(param.getTarget()).build();
>> long channelStart = System.currentTimeMillis();
>> asyncStub = ASRRouteGrpc.newStub(channel);
>> asrResponseStreamObserver = new
>> ASRResponseStreamObserver(speechTranscriberListener);
>> requestObserver = asyncStub.route(asrResponseStreamObserver);
>> RouteRequest requestConf = newRequestHead(param);
>> traceId = requestConf.getAsrConfig().getTraceId();
>> ConnectivityState currentChannelState =
>> channel.getState(true);
>> while (currentChannelState != ConnectivityState.READY) {
>> CountDownLatch latchUntilChannelReady = new
>> CountDownLatch(1);
>> channel.notifyWhenStateChanged(currentChannelState,
>> latchUntilChannelReady::countDown);
>> latchUntilChannelReady.await();
>> currentChannelState = channel.getState(true);
>> if (currentChannelState == ConnectivityState.CONNECTING) {
>> long channelConnecting = System.currentTimeMillis();
>> LOGGER.info("The transition from idle state to
>> connecting takes: {} ms", channelConnecting - channelStart);
>> }
>> }
>> long channelReady = System.currentTimeMillis();
>> if (LOGGER.isInfoEnabled()) {
>> LOGGER.info("Trace id: {}, channel start time: {},
>> channel ready time: {}, creating channel takes: {} ms", traceId,
>> channelStart, channelReady,
>> channelReady - channelStart);
>> }
>> ```
>> ### LOGGER
>>
>> ```
>> 2023-08-22 14:12:34,816 INFO client.ASRClient - The transition from idle
>> state to connecting takes: 1009 ms
>> 2023-08-22 14:12:34,841 INFO client.ASRClient - Trace id:
>> 6afd2c67-e8c5-4cea-bd5c-4b82591a52aa, channel start time: 1692684753807,
>> channel ready time: 1692684754841, creating channel takes: 1034 ms
>> ```
>> ### Description
>> #### code logic
>> 1. first create channel
>> 2. mark a time stamp(channelStart) after the channel is created
>> 3. get the state of channel ,the state is IDEL
>> 4. when the state of channel changes from IDEL to CONNECTING,mark a time
>> stamp(channelConnecting)
>> 5. when the state of channel changes from CONNECTING to READY, mark a
>> time stamp(channelReady)
>>
>> #### Log info
>> 1. It takes 1009ms for channel from IDLE state to CONNECTING state.
>> 2. It takes 25ms for channel from CONNECTIONG state to READY state.
>> ### What's i supposed
>> 1. Does it take too long for a channel to change from IDLE to CONNECTING?
>> 2. I want to reduce the time it takes for a channel to go from IDLE to
>> CONNECTING.
>>
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