Add feedback from @nmussy

Author: msambol

packages/@aws-cdk/aws-pipes-targets-alpha/lib/kinesis.ts

@@ -10,21 +10,12 @@ export interface KinesisTargetParameters {
    * The input transformation to apply to the message before sending it to the target.
    *
    * @see https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-pipes-pipe-pipetargetparameters.html#cfn-pipes-pipe-pipetargetparameters-inputtemplate
-   * @default none
+   * @default - none
    */
   readonly inputTransformation?: IInputTransformation;
 
   /**
-   * Determines which shard in the stream the data record is assigned to. Partition keys are
-   * Unicode strings with a maximum length limit of 256 characters for each key. Amazon Kinesis
-   * Data Streams uses the partition key as input to a hash function that maps the partition key
-   * and associated data to a specific shard. Specifically, an MD5 hash function is used to map
-   * partition keys to 128-bit integer values and to map associated data records to shards. As a
-   * result of this hashing mechanism, all data records with the same partition key map to the
-   * same shard within the stream.
-   *
-   * Minimum: 0
-   * Maximum: 256
+   * Determines which shard in the stream the data record is assigned to.
    *
    * @see https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-pipes-pipe-pipetargetkinesisstreamparameters.html#cfn-pipes-pipe-pipetargetkinesisstreamparameters-partitionkey
    */
@@ -46,9 +37,11 @@ export class KinesisTarget implements ITarget {
 
     validatePartitionKey(parameters.partitionKey);
   }
+
   grantPush(grantee: IRole): void {
     this.stream.grantWrite(grantee);
   }
+
   bind(pipe: IPipe): TargetConfig {
     if (!this.streamParameters) {
       return {
@@ -66,7 +59,7 @@ export class KinesisTarget implements ITarget {
 }
 
 function validatePartitionKey(pk: string) {
-  if (pk.length < 0 || pk.length > 256) {
-    throw new Error(`Partition key must be between 0 and 256 characters, received ${pk.length}`);
+  if (pk.length > 256) {
+    throw new Error(`Partition key must be less than or equal to 256 characters, received ${pk.length}`);
   }
 }

packages/@aws-cdk/aws-pipes-targets-alpha/test/integ.kinesis.ts

@@ -44,6 +44,6 @@ test.assertions.awsApiCall('SQS', 'sendMessage', {
 
 // It is nontrivial to read from a Kinesis data stream.
 // Manual verification was done to ensure the record made
-// it from the SQS to Kinesis via the pipe.
+// it from SQS to Kinesis via the pipe.
 
 app.synth();

packages/@aws-cdk/aws-pipes-targets-alpha/test/kinesis.test.ts

@@ -106,6 +106,6 @@ describe('Kinesis source parameters validation', () => {
       new KinesisTarget(stream, {
         partitionKey: 'x'.repeat(257),
       });
-    }).toThrow('Partition key must be between 0 and 256 characters, received 257');
+    }).toThrow('Partition key must be less than or equal to 256 characters, received 257');
   });
 });