reduce to 4-6 instances, smaller memory (#962)

* reduce to 10 instances

* reduce memory and max instances

Author: gfr10598

cmd/etl_worker/app-batch.yaml

@@ -13,15 +13,15 @@ resources:
   cpu: 4
   # Instances support between [(cpu * 0.9) - 0.4, (cpu * 6.5) - 0.4]
   # Actual memory available is exposed via GAE_MEMORY_MB environment variable.
-  memory_gb: 15
+  memory_gb: 8
 
   # TODO - Adjust once we understand requirements.
   disk_size_gb: 10
 
 automatic_scaling:
   # This is intended for batch jobs.
-  min_num_instances: 10
-  max_num_instances: 40
+  min_num_instances: 4
+  max_num_instances: 6
   # Very long cool down period, to reduce the likelihood of tasks being truncated.
   cool_down_period_sec: 1800
   # We don't care much about latency, so a high utilization is desireable.