Design features
While deciding DynamoDB's architecture, several design considerations have been made that were quite new at that time, and over time these techniques have become so popular that it has inspired many NoSQL databases we are using these days. The following are a few such features:
- Data replication
- Conflict resolution
- Scalability
- Symmetry
- Flexibility
Data replication
While deciding upon the data replication strategy, Amazon engineers put significant focus on achieving high availability and reliability. Traditional data replication techniques used to have synchronous replica update, which means that if the value for a certain attribute gets changed, it would be updated with all its replicas at that point of time only, and unless that is done, access to that attribute would be made unavailable. This technique was used in order to avoid wrong or stale data being provided to the user. But this technique was not that efficient, as networks and disks are bound to fail and waiting for...
