Fusing and current limiting

Fuse

block ORM( service ) Connection to database . When a service node exceeds the load , Stop the node from accessing the database , So that the database can ensure sufficient resources to provide services for other nodes .

Current limiting

In the face of overload request, turn on current limiting , In order to protect some requests, high-quality response can be obtained .

background

With the continuous expansion of data scale , The distributed method of using multi node cluster has gradually become a trend . Unified management ability of the overall perspective of the cluster , And fine-grained control over individual components , It is an indispensable function in the modern database system based on the separation of storage and calculation .

Challenge

Regulatory challenges , It lies in the unified management capability of centralized cluster management and the refined operation capability in case of single point of failure .

The challenge of centralized management is to uniformly manage the state of database storage nodes and middleware computing nodes , And it can detect the latest changes in the distributed environment in real time , Further provide basis for cluster control and scheduling .

In the face of overloaded traffic , Fuse and limit current for a node , To ensure that the entire database cluster can continue to run , It is a challenge to the control ability of a single node in a distributed system .

The goal is

Realize the integrated management ability from database to computing node , Provide fine-grained control for components in failure , And provide the possibility of recovery as much as possible .