Stream support for local dynamodb?

Question

I can't seem to get stream support working in dynamo db local, are they supported? The only indication I could find that they are, is the very last bullet point in http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Tools.DynamoDBLocal.html#Tools.DynamoDBLocal.Differences

With dynamodb local, it appears that the StreamSpecification is ignored so there is no LatestStreamArn when calling createTable or describeTable

The following code returns LatestStreamArn with the managed dynamodb service but not dynamodb local:

ddb.createTable({
  TableName: 'streaming_test',

  AttributeDefinitions: [
    { AttributeName: 'id', AttributeType: 'S' }
  ],

  KeySchema: [
    { AttributeName: 'id', KeyType: 'HASH' }
  ],

  ProvisionedThroughput: {
    ReadCapacityUnits: 5,
    WriteCapacityUnits: 5
  },

  StreamSpecification: {
    StreamEnabled: true,
    StreamViewType: 'NEW_AND_OLD_IMAGES'
  }
}, function (err, data) {
  if (err) {
    console.log(err, err.stack)
  } else {
    // data.TableDescription.StreamSpecification and 
    // data.TableDescription.LatestStreamArn are undefined 
    // for dynamodb local
    console.log(data)
  }
})

Alexander Patrikalakis Alexander Patrikalakis · Accepted Answer · 2017-02-12T08:44:25

I am not able to reproduce your issue. Steps I took:

Download DynamoDB Local from here
Start DynamoDB local with java -Djava.library.path=./DynamoDBLocal_lib -jar DynamoDBLocal.jar -inMemory -sharedDb
Navigate to http://localhost:8000/shell/
Paste the code below and click the play button. The only difference between what I wrote and your code above is that I replaced ddb with dynamodb.

When I did this, I got a non-null and non-empty LatestStreamArn of arn:aws:dynamodb:ddblocal:000000000000:table/streaming_test/stream/2017-02-12T08:39:03.722.

dynamodb.createTable({
  TableName: 'streaming_test',

  AttributeDefinitions: [
    { AttributeName: 'id', AttributeType: 'S' }
  ],

  KeySchema: [
    { AttributeName: 'id', KeyType: 'HASH' }
  ],

  ProvisionedThroughput: {
    ReadCapacityUnits: 5,
    WriteCapacityUnits: 5
  },

  StreamSpecification: {
    StreamEnabled: true,
    StreamViewType: 'NEW_AND_OLD_IMAGES'
  }
}, function (err, data) {
  if (err) {
    console.log(err, err.stack)
  } else {
    // data.TableDescription.StreamSpecification and 
    // data.TableDescription.LatestStreamArn are undefined 
    // for dynamodb local
    console.log(data)
  }
})

Stream support for local dynamodb?

1 Answers