MySQL Router with NDB Cluster

MySQL Router with NDB Cluster

There is a general question on  can we use MySQL router for NDB Cluster?

MySQL Router can be used with MySQL NDB Cluster to provide intelligent routing capabilities and improve the overall availability and scalability of the cluster deployment.

In an NDB Cluster setup, MySQL Router can act as a middleware component between the application clients and the cluster data nodes. It automatically discovers the topology of the cluster and routes client requests to the appropriate data nodes based on the operation type (read or write) and the current state of the cluster.

Here are some key benefits of using MySQL Router with MySQL NDB Cluster:

1. Read/Write Splitting: MySQL Router can automatically identify read and write queries from the application clients. It routes write queries to the primary data node (or group of data nodes in a multi-primary setup), while read queries are distributed across the remaining data nodes. This read/write splitting improves overall throughput and scalability by utilizing the resources of multiple data nodes for read operations.

2. Load Balancing: MySQL Router can perform load balancing for read queries by distributing them across the available data nodes. This helps in evenly distributing the read load and preventing any single data node from becoming a bottleneck.

3. Failover and High Availability: In case of a data node failure or maintenance operation, MySQL Router can automatically detect the change in cluster topology and redirect client traffic to the remaining available data nodes. This ensures high availability and minimizes disruption to client applications.

4. Connection Pooling: MySQL Router can maintain a pool of persistent connections to the data nodes, reducing the overhead of establishing new connections for each client request. This can improve overall performance, especially in scenarios with a high number of short-lived client connections.

5. Simplified Client Configuration: By using MySQL Router, application clients no longer need to handle the complexities of connecting to multiple data nodes or managing failover scenarios. They can connect to a single entry point (MySQL Router), which transparently routes their requests to the appropriate data nodes.

To use MySQL Router with MySQL NDB Cluster, you need to configure MySQL Router with the appropriate metadata and connection details for your NDB Cluster deployment. MySQL Router can then automatically discover the cluster topology and start routing client traffic accordingly.

It's important to note that while MySQL Router can provide intelligent routing and load balancing capabilities, it does not replace the need for proper cluster configuration and management. MySQL NDB Cluster still requires careful planning and configuration to ensure data consistency, high availability, and optimal performance.