英文:
How to solve grpc Deadline Exceeded error？
问题
我有一个由Go编写的gRPC服务器和一个Python客户端，有时会出现以下错误：
eggs/grpcio-1.0.0-py2.7-linux-x86_64.egg/grpc/_channel.py"，第432行，_end_unary_response_blocking函数中
raise _Rendezvous(state, None, None, deadline)
InternalServerError: Deadline Exceeded
> gRPC允许客户端在调用远程方法时指定截止时间。这指定了客户端在RPC完成之前希望等待服务器响应的时间，否则将返回DEADLINE_EXCEEDED错误。在服务器端，服务器可以查询截止时间，以查看特定方法是否已超时，或者完成该方法还剩多少时间。
>
> 截止时间的指定方式因语言而异-例如，在Python中始终需要指定截止时间，并非所有语言都有默认截止时间。
有没有办法解决这个错误？
英文:
I have grpc server which write by go and a python client, sometimes, the errors occurred as below:
eggs/grpcio-1.0.0-py2.7-linux-x86_64.egg/grpc/_channel.py\", line 432, in _end_unary_response_blocking\n raise _Rendezvous(state, None, None, deadline)\nInternalServerError: Deadline Exceeded\n"}
> gRPC allows clients to specify a deadline value when calling a remote
> method. This specifies how long the client wants to wait for a
> response from the server before the RPC finishes with the error
> DEADLINE_EXCEEDED. On the server side, the server can query the
> deadline to see if a particular method has timed out, or how much time
> is left to complete the method.
>
> How the deadline is specified varies from language to language - for
> example, a deadline value is always required in Python, and not all
> languages have a default deadline.
is there way to solve this error?
答案1
得分: 4
如上面的评论中提到的，截止日期可以是客户端和服务器之间的任何事情，包括网络和服务器的实现。由于您正在通过网络进行通信，偶尔会出现截止日期，例如在数据包丢失时。一般来说，您可以在这里有几个选择：
- 优化服务器实现，以更快地处理您的请求。
- 如果客户端设置了较短的截止日期，可以将其延长。
- 优雅地处理截止日期错误：
- 重试。确保使用指数退避，以免在服务器超载情况下使问题变得更糟。
- 向上游报告错误。
- 有时还可以回退到不使用该grpc调用并降低体验的方式。
英文:
As mentioned in the comment above, deadlines can be just about anything between the client and server, including the network and implementation of the server. As you are talking over a network, deadlines should be expected occasionally, for example during package losses. In general, there are a couple of options on what you can do here:
- Optimize the server implementation to handle your requests faster.
- In case the client sets a short deadline, increase this.
- Handle the deadline errors gracefully by:
- Retrying. Just make sure to use an exponential back-off, so you don't make the problem worse in case of a server overload situation.
- Report an error up-streams.
- Sometimes it may also be possible to fall back to not use that grpc call and degrade the experience.
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