[aws-dynamodb] replicationRegions sets billing to PAY_PER_REQUEST and autoScaleReadCapacity will fail

[rjcoelho]

According to https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/V2globaltables_reqs_bestpractices.html I should be able to have Autoscaling and Global tables.

If I set replicationRegions I get the error "AutoScaling is not available for tables with PAY_PER_REQUEST billing mode", when I do autoScaleReadCapacity. This is because table's constructor sets PAY_PER_REQUEST when I pass replicationRegions.

As it stands I have no way of declaring global tables with autoscaling.

AFAIK what we want to avoid is global tables with provisioning and without autoscaling, so we should test for that on the add global replication tables method and make it public instead of calling it from the constructor.

[pathik9]

Probably related with: #11346

[jumic]

@rjcoelho When I understand your problem correctly, it is the same requirement as requested in #11346. This was resolved by PR #12159. Or is there something missing?

You can specify a global table with provisioning and use autoscaling, now. See this example.

const globalTable = new dynamodb.Table(this, 'Table', {
  partitionKey: { name: 'id', type: dynamodb.AttributeType.STRING },
  replicationRegions: ['us-east-1'],
  billingMode: dynamodb.BillingMode.PROVISIONED,    
});
globalTable.autoScaleReadCapacity({
  maxCapacity: 10,
  minCapacity: 5,
}).scaleOnUtilization({
  targetUtilizationPercent: 90,
});
globalTable.autoScaleWriteCapacity({
  maxCapacity: 10,
  minCapacity: 5,
}).scaleOnUtilization({
  targetUtilizationPercent: 90,
});

@peterwoodworth Maybe a candidate for "closing soon".

[peterwoodworth]

Yes, this was resolved by PR #12159 so no need to keep this open

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