fix(lambda-event-sources): increase batch size restriction (aws#19317)

fixes aws#19285 
I can successfully deploy a stack by overriding the batch size to 10000 - need to contact cloudformation team to update their docs

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

packages/@aws-cdk/aws-lambda-event-sources/lib/dynamodb.ts

@@ -17,8 +17,8 @@ export class DynamoEventSource extends StreamEventSource {
 
     if (this.props.batchSize !== undefined
       && !Token.isUnresolved(this.props.batchSize)
-      && (this.props.batchSize < 1 || this.props.batchSize > 1000)) {
-      throw new Error(`Maximum batch size must be between 1 and 1000 inclusive (given ${this.props.batchSize})`);
+      && (this.props.batchSize < 1 || this.props.batchSize > 10000)) {
+      throw new Error(`Maximum batch size must be between 1 and 10000 inclusive (given ${this.props.batchSize})`);
     }
   }
 

packages/@aws-cdk/aws-lambda-event-sources/test/dynamo.test.ts

@@ -116,7 +116,7 @@ describe('DynamoEventSource', () => {
 
     // WHEN
     fn.addEventSource(new sources.DynamoEventSource(table, {
-      batchSize: 50,
+      batchSize: 5000,
       startingPosition: lambda.StartingPosition.LATEST,
     }));
 
@@ -131,7 +131,7 @@ describe('DynamoEventSource', () => {
       'FunctionName': {
         'Ref': 'Fn9270CBC0',
       },
-      'BatchSize': 50,
+      'BatchSize': 5000,
       'StartingPosition': 'LATEST',
     });
 
@@ -153,7 +153,7 @@ describe('DynamoEventSource', () => {
       type: 'Number',
       default: 100,
       minValue: 1,
-      maxValue: 1000,
+      maxValue: 10000,
     });
     // WHEN
     fn.addEventSource(new sources.DynamoEventSource(table, {
@@ -217,12 +217,12 @@ describe('DynamoEventSource', () => {
     expect(() => fn.addEventSource(new sources.DynamoEventSource(table, {
       batchSize: 0,
       startingPosition: lambda.StartingPosition.LATEST,
-    }))).toThrow(/Maximum batch size must be between 1 and 1000 inclusive \(given 0\)/);
+    }))).toThrow(/Maximum batch size must be between 1 and 10000 inclusive \(given 0\)/);
 
 
   });
 
-  test('fails if batch size > 1000', () => {
+  test('fails if batch size > 10000', () => {
     // GIVEN
     const stack = new cdk.Stack();
     const fn = new TestFunction(stack, 'Fn');
@@ -236,9 +236,9 @@ describe('DynamoEventSource', () => {
 
     // WHEN
     expect(() => fn.addEventSource(new sources.DynamoEventSource(table, {
-      batchSize: 1001,
+      batchSize: 10001,
       startingPosition: lambda.StartingPosition.LATEST,
-    }))).toThrow(/Maximum batch size must be between 1 and 1000 inclusive \(given 1001\)/);
+    }))).toThrow(/Maximum batch size must be between 1 and 10000 inclusive \(given 10001\)/);
 
 
   });