3.6.5 Core Concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Circuit Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Request Limit concurrency in OLTP scenarios. 3.1. Sharding 19 Apache ShardingSphere document, v5.2.0 Mass data real-time analysis in OLAP scenarios In traditional database architecture, if users want to analyze data time, further provide information with control and scheduling. In the overload traffic scenario, circuit breaker and request limiting for a node to ensure whole database cluster can run continuously is

3.6.5 Core Concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Circuit Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Request Limit concurrency in OLTP scenarios. 3.1. Sharding 18 Apache ShardingSphere document, v5.2.1 Mass data real-time analysis in OLAP scenarios In traditional database architecture, if users want to analyze data time, further provide information with control and scheduling. In the overload traffic scenario, circuit breaker and request limiting for a node to ensure whole database cluster can run continuously is

8.5.5 Core Concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Circuit Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Request Limit high concurrency in OLTP scenarios. 8.1. Sharding 22 Apache ShardingSphere document Mass data real-time analysis in OLAP scenarios In traditional database architecture, if users want to analyze data time, further provide information with control and scheduling. In the overload traffic scenario, circuit breaker and request limiting for a node to ensure whole database cluster can run continuously is

8.5.5 Core Concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Circuit Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Request Limit high concurrency in OLTP scenarios. 8.1. Sharding 22 Apache ShardingSphere document Mass data real-time analysis in OLAP scenarios In traditional database architecture, if users want to analyze data time, further provide information with control and scheduling. In the overload traffic scenario, circuit breaker and request limiting for a node to ensure whole database cluster can run continuously is

transform (data encrypt and mask), authen‐ tication (security, audit and authority), governance (circuit breaker and access limitation and an‐ alyze, QoS and observability). • Pluggable: Leveraging the instance_port_x} ├ ├ ├ ├──${your_instance_ip_b}@${your_instance_port_y} ├ ├ ├ ├──.... ├ ├ ├──circuit_breaker ├ ├ ├ ├──${your_instance_ip_c}@${your_instance_port_v} ├ ├ ├ ├──${your_instance_ip_d}@ the config center will immediately take effect in the producing environment. Operation Guide Circuit Breaker Write DISABLED (case insensitive) to IP@PORT to disable that instance; delete DISABLED to

4.2.4 Core Concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Circuit Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Request Limit transform (data encrypt and mask), authen‐ tication (security, audit and authority), governance (circuit breaker and access limitation and an‐ alyze, QoS and observability). • Pluggable: Leveraging the time, further provide information with control and scheduling. In the overload traffic scenario, circuit breaker and request limiting for a node to ensure whole database cluster can run continuously is

4.2.4 Core Concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Circuit Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Request Limit transform (data encrypt and mask), authen‐ tication (security, audit and authority), governance (circuit breaker and access limitation and an‐ alyze, QoS and observability). • Pluggable: Leveraging the time, further provide information with control and scheduling. In the overload traffic scenario, circuit breaker and request limiting for a node to ensure whole database cluster can run continuously is

instance_port_x} ├ ├ ├ ├──${your_instance_ip_b}@${your_instance_port_y} ├ ├ ├ ├──.... ├ ├ ├──circuit_breaker ├ ├ ├ ├──${your_instance_ip_c}@${your_instance_port_v} ├ ├ ├ ├──${your_instance_ip_d}@ Zookeeper 命令如下： [zk: localhost:2181(CONNECTED) 0] set /${your_zk_namespace}/status/compute_nodes/ circuit_breaker/${your_instance_ip_a}@${your_instance_port_x} DISABLED 禁用从库 在读写分离场景下，可在数据源名称子节点中写入 DIS

the config center will immediately take effect in the producing environment. Operation Guide Circuit Breaker Write DISABLED (case insensitive) to IP@PID@UUID to disable that instance; delete DISABLED

State，Vendor Code 和详细错误信息提供，在 SQL 执行错误时返回给客户端。 目前内容为草稿，错误码仍可能调整。 SQL State Vendor Code 错误信息 01000 10000 Circuit break open, the request has been ignored 08000 10001 The URL ‘%s‘ is not recognized, please refer