工作中遇到一個(gè)問題，上游服務(wù)通過grpc調(diào)用下游服務(wù)，但是由于下游服務(wù)負(fù)載太高導(dǎo)致上游服務(wù)的調(diào)用會隨機(jī)出現(xiàn)超時(shí)的情況，但是有一點(diǎn)不太明確：超時(shí)之后，下游服務(wù)還會繼續(xù)進(jìn)行計(jì)算么？

于是自己寫了一個(gè)damon試了一下：

client：

# Copyright 2015 gRPC authors.## Licensed under the Apache License, Version 2.0 (the 'License');# you may not use this file except in compliance with the License.# You may obtain a copy of the License at## http://www.apache.org/licenses/LICENSE-2.0## Unless required by applicable law or agreed to in writing, software# distributed under the License is distributed on an 'AS IS' BASIS,# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.# See the License for the specific language governing permissions and# limitations under the License.'''The Python implementation of the GRPC helloworld.Greeter client.'''from __future__ import print_functionimport loggingimport grpcimport helloworld_pb2import helloworld_pb2_grpcdef run(): # NOTE(gRPC Python Team): .close() is possible on a channel and should be # used in circumstances in which the with statement does not fit the needs # of the code. with grpc.insecure_channel(’localhost:50051’) as channel: stub = helloworld_pb2_grpc.GreeterStub(channel) response = stub.SayHello(helloworld_pb2.HelloRequest(name=’you’), timeout=30) print('Greeter client received: ' + response.message)if __name__ == ’__main__’: logging.basicConfig() run()

server：

# Copyright 2015 gRPC authors.## Licensed under the Apache License, Version 2.0 (the 'License');# you may not use this file except in compliance with the License.# You may obtain a copy of the License at## http://www.apache.org/licenses/LICENSE-2.0## Unless required by applicable law or agreed to in writing, software# distributed under the License is distributed on an 'AS IS' BASIS,# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.# See the License for the specific language governing permissions and# limitations under the License.'''The Python implementation of the GRPC helloworld.Greeter server.'''from concurrent import futuresimport timeimport loggingimport grpcimport helloworld_pb2import helloworld_pb2_grpc_ONE_DAY_IN_SECONDS = 60 * 60 * 24class Greeter(helloworld_pb2_grpc.GreeterServicer): def SayHello(self, request, context): count = 0 while count < 10: print(’time:%s’ % (time.time())) time.sleep(5) return helloworld_pb2.HelloReply(message=’Hello, %s!’ % request.name)def serve(): server = grpc.server(futures.ThreadPoolExecutor(max_workers=10)) helloworld_pb2_grpc.add_GreeterServicer_to_server(Greeter(), server) server.add_insecure_port(’[::]:50051’) server.start() try: while True: time.sleep(_ONE_DAY_IN_SECONDS) except KeyboardInterrupt: server.stop(0)if __name__ == ’__main__’: logging.basicConfig() serve()

這兩個(gè)例子就是在grpc官方提供的python例子上做了一下小的改動，得到的結(jié)果是：當(dāng)client超時(shí)報(bào)錯(cuò)退出之后，server還是會繼續(xù)進(jìn)行計(jì)算，直到結(jié)束，那如果是這樣的話，超時(shí)的機(jī)制對于server來說是沒有作用的，即使client已經(jīng)不再等待這個(gè)結(jié)果了，但是server還是會繼續(xù)計(jì)算，浪費(fèi)server的資源。

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