Fault Tolerance

Introduction

go-chassis support fault-tolerance, so that you can define if error occurs, how to deal with this error.

Configuration

the fault-tolerace related configurations is all in load_balancing.yaml, prefix is cse.loadbalance. set retryEnabled to true to enable it

retryEnabled

(optional, bool) Enable fault tolerance, default is false

retryOnSame

(optional, int) if remote call failed, then retry on same instance, default is 0

retryOnNext

(optional, int) if remote call failed, then call load balancing again to get next instance, default is 0

backoff.kind

(optional, string) backoff policy: [exponential|constant|zero] default is exponential

• zero: do not wait for any time。

• constant: after each failed retry, wait for constant time. Use backoff.minMs to set the time。

• exponential: time wil exponential growth after each retry, till this time reach to MaxMs. Use backoff.minMs to set the the first wait time

backoff.MinMs

(optional, int) minimum wait time between each retry, unit is ms, default is 0

backoff.MaxMs

(optional, int) maximum wait time between each retry, unit is ms, default is 0

example

edit load_balancing.yaml.

servicecomb:
  loadbalance:
    retryEnabled: true
    retryOnNext: 2
    retryOnSame: 3
    backoff:
      kind: exponential
      minMs: 200
      maxMs: 400