func (s *RegionRequestSender) sendCopReqToRegion(ctx *RPCContext, req *coprocessor.Request, timeout time.Duration) (resp *coprocessor.Response, retry bool, err error) {
req.Context = ctx.KVCtx
resp, err = s.client.SendCopReq(ctx.Addr, req, timeout)
if err != nil {
if e := s.onSendFail(ctx, err); e != nil {
return nil, false, errors.Trace(err)
}
return nil, true, nil
}
return
}
