feat(batch): ephemeralStorage property on job definitions

packages/@aws-cdk/aws-batch-alpha/lib/ecs-container-definition.ts

@@ -935,8 +935,12 @@ export class EcsFargateContainerDefinition extends EcsContainerDefinitionBase im
     this.ephemeralStorageSize = props.ephemeralStorageSize;
 
     // validates ephemeralStorageSize is within limits
-    if (props.ephemeralStorageSize && (props.ephemeralStorageSize.toGibibytes() > 200 || props.ephemeralStorageSize.toGibibytes() < 21)) {
-      throw new Error('Ephemeral Storage Size must be within 21 to 200 GiB.');
+    if (props.ephemeralStorageSize) {
+      if (props.ephemeralStorageSize.toGibibytes() > 200) {
+        throw new Error(`ECS Fargate container ${id} specifies ephemeralStorageSize at ${props.ephemeralStorageSize.toGibibytes()} > 200 GB`);
+      } else if (props.ephemeralStorageSize.toGibibytes() < 21) {
+        throw new Error(`ECS Fargate container ${id} specifies ephemeralStorageSize at ${props.ephemeralStorageSize.toGibibytes()} < 21 GB`);
+      }
     }
   }
 

packages/@aws-cdk/aws-batch-alpha/test/ecs-container-definition.test.ts

@@ -39,7 +39,6 @@ const defaultExpectedProps: CfnJobDefinitionProps = {
   },
 };
 
-let app: App;
 let stack: Stack;
 let pascalCaseExpectedProps: any;
 
@@ -760,7 +759,7 @@ describe('EC2 containers', () => {
 describe('Fargate containers', () => {
   // GIVEN
   beforeEach(() => {
-    app = new App();
+    const app = new App();
     stack = new Stack(app);
     pascalCaseExpectedProps = capitalizePropertyNames(stack, defaultExpectedProps);
   });
@@ -855,14 +854,14 @@ describe('Fargate containers', () => {
         fargatePlatformVersion: ecs.FargatePlatformVersion.LATEST,
         ephemeralStorageSize: Size.gibibytes(19),
       }),
-    })).toThrow('Ephemeral Storage Size must be within 21 to 200 GiB.');
+    })).toThrow('ECS Fargate container EcsFargateContainer specifies ephemeralStorageSize at 19 < 21 GB');
 
     expect(() => new EcsJobDefinition(stack, 'ECSJobDefn2', {
       container: new EcsFargateContainerDefinition(stack, 'EcsFargateContainer2', {
         ...defaultContainerProps,
         fargatePlatformVersion: ecs.FargatePlatformVersion.LATEST,
         ephemeralStorageSize: Size.gibibytes(201),
       }),
-    })).toThrow('Ephemeral Storage Size must be within 21 to 200 GiB.');
+    })).toThrow('ECS Fargate container EcsFargateContainer2 specifies ephemeralStorageSize at 201 > 200 GB');
   });
 });