Mersher Flow Control

• Flow control avoids microservice overload operations by controlling the data transfer rate. This guide will show you how to use the flow control capabilities provided by mersher

Before you start

• Walk through mersher-quick-start and have mersher display programs running.

Enable

• Change the configuration file chassis.yaml of mersher_calculator. Add a flow control configuration in chassis.yaml as follows. Restart the service.

  flowcontrol:
   Provider:
     qps:
       enabled: true                 # enable rate limiting or not
       global:
         limit: 0                    # default limit of provider
       limit:
         Server: 0                  # rate limit for request from a provider
  

  The frequency limit configuration make the request accepted per second is 0 which means no service is provided.

Verification

• Click the Submit button and you can see that the request was rejected due to the flow control of mersher. Now the request can not reach real httpserver.

What’s next

• See quick start for Service Management

• Learn more about Flow Control