Hi Tien

You can refer to QOS feature of DUBBO.

QoS's Parameters: http://dubbo.apache.org/en-us/docs/user/references/qos.html 
<http://dubbo.apache.org/en-us/docs/user/references/qos.html>
Usage: https://dubbo.apache.org/en-us/blog/introduction-to-dubbo-qos.html 
<https://dubbo.apache.org/en-us/blog/introduction-to-dubbo-qos.html>


best regards,

Jason

> On Sep 23, 2019, at 16:50, Tien Dat PHAN <[email protected]> wrote:
> 
> Dear experts,
> 
> We are using Dubbo for exporting our services to outside clients.
> During the execution, we may have to switch some nodes into maintenance mode 
> (for maintenance purposes of course), which means those nodes are not serving 
> requests until they are switched back to normal mode.
> 
> Our question is: what is the recommended procedure to gracefully put an 
> exported service into maintenance mode, without causing a perturbation on the 
> client side, which may still maintain an open connection with the exported 
> service?
> 
> Best regards
> Tien Dat PHAN

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