Remove throughput limit for on-demand tables

[cdhowie]

DynamoDB has a new on demand pricing model, where you pay per request and do not provision any capacity. Since the cost is only per-request and not based on requests per second, it does not make sense to throttle reads from those tables.

An on-demand table has provisioned capacity values of 0:

"ProvisionedThroughput": {
  "NumberOfDecreasesToday": 0,
  "WriteCapacityUnits": 0,
  "ReadCapacityUnits": 0,
  "LastDecreaseDateTime": 1546977951.249
}

[majindageta]

Hello,
I had the same issue and managed to modify the code adding this:
this.onDemandReadCapacity = options.onDemandReadCapacity || 25;
to the dynamo-backup.js

and in the same file, in the _copyTable function i've added:
var limit = Math.max((data.Table.ProvisionedThroughput.ReadCapacityUnits * readPercentage) | 0, 1); if (data.Table.BillingModeSummary.BillingMode === 'PAY_PER_REQUEST') { limit = self.onDemandReadCapacity; }

When creating the instance of DynamoBackup just add a property like:
onDemandReadCapacity: 400

Thinking about doing a pull requests but the repo seems quite dead

[shanebdavis]

@majindageta I'd love for you to do a pull-request - or a fork if it isn't accepted. On-demand really is the better option for most people these days.

[majindageta]

Hello @shanebdavis, this is the pull-request #92
and you can find the change in my fork https://github.com/majindageta/dynamo-backup-to-s3

Have a good day!