Cassandra

Comparing write-optimized LSM-trees with read-optimized B-trees for database storage

Techniques for handling concurrent writes and conflicts in distributed systems

Dynamo-style replication with quorums and eventual consistency

Multiple writable nodes with conflict resolution strategies

Key range, hash, and composite partitioning approaches

Redistributing data when adding or removing nodes

How systems route requests to the correct partition

Global vs local secondary indexes in distributed systems