This article explains local write forwarding in Amazon Aurora, a feature enabling applications to send both read and write commands to reader nodes within a single cluster.

• Applications can connect to any reader node and issue reads and writes seamlessly
• Writes are automatically forwarded to the writer node for processing
• Aurora_replica_read_consistency parameter controls consistency levels: eventual, session, or global
• Eventual consistency returns immediately; session consistency waits for current session writes
• Global consistency waits for all database writes, adding round-trip and replication lag
• Reduces need for proxies or complex application logic for read/write distribution
• Improves writer resource utilization by handling reads on reader nodes
• Aurora_fwd_writer_max_connections_pct parameter prevents writer connection overload

Local write forwarding simplifies Aurora application design by allowing single connections to reader nodes for both reads and writes, with configurable consistency guarantees.