My understanding that it's per shard. So if you never partition, only one lambda function will run at a time. Kinesis might be a good solution if you wanted to

My understanding that it's per shard. So if you never partition, only one lambda function will run at a time. Kinesis might be a good solution if you wanted to use this code to run a Disqus-scale service with millions of blogs. Not much would need to change.