When I was designing the architecture of nderground I strongly considered using MongoDB.

Apache Cassandra has the same herd behavior problem. Both Cassandra and MongoDB have a serious problem with the effort required to configure, manage, and operate the data store. If you are already using AWS, you really should consider one of the managed services they offer like RDS, DynamoDB, S3, and ElastiCache.

Check out the article I wrote on the topic:

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