Resource Scheduling Thread Circuit Breaker

Version

Function Description

Problems such as thread blocking may occur when you access project resources, which often lead to project downtime.

Fanruan provides the resource scheduling thread circuit breaker function to provide underpinning method of fault tolerance for thread blocking problems and reduce the risk of downtime.

Function Enabling

If you want to enable the resource scheduling thread circuit breaker function, you should select the corresponding opening steps according to your situation as the steps to enable the function are different for different versions of FineReport. 

FineReport Version	Enabling Procedure
Version 11.0.9 and Lower Versions	You need to install the Circuit Breaker of Resource Schedule plugin of version V1.4.3 and above to enable the resource scheduling thread circuit breaker function. You can click to download plugin: Circuit Breaker of Resource Schedule For details about how to install the plugin in the designer, see Designer Plugin Management. For details about how to install the plugin on the server, see Server Plugin Management. Note:  If you use the plugin of V1.4.2 and lower versions, the system may report errors. So ensure that you have updated the plugin.
Version 11.0.30 and Higher Versions	1. Log in to the decision-making system as the admin and choose System Management > System Setting > General. 2. Enable Thread Circuit Breaker in Downtime Prevention Configuration. Note:  When FineReport is upgraded from version 11.0.29 or lower to version 11.0.30 and higher, the Circuit Breaker of Resource Schedule plugin will be disabled automatically and Thread Circuit Breaker is disabled by default. You need to enable Thread Circuit Breaker manually.

Function Entry

When the function is enabled, the following conditions take effect automatically.

1. Replacing the original http thread pool with an asynchronous thread pool. 

2. Threads are considered to be highly loaded when the CPU load exceeds 80% or when the Report thread pool threads are used more than 85%.

Thread blocking deadlock and long execution thread detection is triggered every 15 seconds when threads are highly loaded.

If more than 3 threads are blocked in the same session, session closure will be triggered.

A thread deadlock will directly interrupt the deadlocked thread. A long execution thread will trigger the shutdown. 

After threads are terminated, the message "The extremely high system memory pressure triggers the system anti-downtime protection. The current template calculation has been suspended. Try again later." will be displayed.