更新 'defaults'

defaults

@@ -3,6 +3,6 @@
     "spladder_docker":"registry.cn-shanghai.aliyuncs.com/pgx-docker-registry/spladder:v2.4.2",
     "spladder_cluster":"OnDemand bcs.a2.3xlarge img-ubuntu-vpc",
     "samtools_docker":"registry.cn-shanghai.aliyuncs.com/pgx-docker-registry/samtools:v1.3.1",
-    "samtools_cluster":"OnDemand bcs.a2.3xlarge img-ubuntu-vpc",
+    "samtools_cluster":"OnDemand bcs.a2.large img-ubuntu-vpc",
     "disk_size":"200"
     }