Overview

MaxScale's Read/Write Split Router (readwritesplit) performs query-based load balancing. For each client connected to MaxScale, it opens up connections to multiple back-end database servers. When the client sends a write query to MaxScale, it routes the query to the connection opened with the primary server. When the client sends a read query to MaxScale, it routes the query to a connection opened with one of the replicas.

This page contains topics that need to be considered when designing applications that use the Read/Write Split Router.

• How does the Read/Write Split Router route queries?

• How does the Read/Write Split Router select replica servers to load balance queries?

• How does the ensuring-causal-consistency-with-maxscales-readwrite-split-routerRead/Write Split Router ensure that load-balanced read-only queries are causally consistent?

• How does the Write Split Router reconnect client connections to the new primary server after automatic failover?

• How does the Read/Write Split Router retry failed reads?

• How does the Read/Write Split Router retry failed queries during automatic failover?

Additional information is available here.