test(default): config

defaults

@@ -30,6 +30,6 @@
   "sequenza_docker": "registry.cn-shanghai.aliyuncs.com/choppy-pipe/sequenza:3.0.0",
   "msisensor_docker": "registry.cn-shanghai.aliyuncs.com/choppy-pipe/msisensor-pro:1.2.0",
   "tmb_docker": "registry.cn-shanghai.aliyuncs.com/choppy-pipe/tmb_docker:1.0.0",
-  "cluster_config": "OnDemand bcs.a2.7xlarge img-ubuntu-vpc",
+  "cluster_config": "OnDemand bcs.b2.3xlarge img-ubuntu-vpc",
   "disk_size": "200"
 }