Guided practice

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  74. Design a Wide-Column Store like Cassandra

  A leaderless wide-column store: a token ring with virtual nodes, consistency tuned per query, an LSM write path and repair that keeps replicas converged.

  ClassicMedium

  DatabasesAWSCassandra

  +4

  Amazon KeyspacesLSM treesNoSQLWide column

  Worked design

  Practice
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  75. Design a Key-Value Store like DynamoDB

  A key-value store like DynamoDB, from one durable node to Paxos-replicated partitions to global tables run for thousands of tenants.

  ClassicMedium

  ShardingDatabasesDistributed systems

  +5

  AWSDynamoDBKey value storeNoSQLReplication

  Worked design

  Practice

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