Overview
Version
Report Server Version | Functional Change |
11.0 | / |
11.0.32 | Optimized triggering logics and prompts. |
11.0.34 | Added the configuration item Report Rate Limiting Threshold. Optimized triggering logics. |
Function Description
Problems such as thread blocking may occur when users access project resources, which often leads to project downtime.
FanRuan provides the Circuit Breaker of Resource Schedule function to provide a fault tolerance strategy for thread blocking problems and reduce downtime risks.
11.0.34 and Later Versions
Function Enabling
1. Log in to the FanRuan application system as the admin and choose System Management > System Setting > General.
2. In Downtime Prevention Configuration, enable Thread Circuit Breaker, configure Report Rate Limiting Threshold, and save the setting.
When Thread Circuit Breaker, the overall switch, is not enabled, the configuration of Report Rate Limiting Threshold is invalid.
You can customize Report Rate Limiting Threshold (default value: 0.5, namely 50%; valid setting range: decimal between 0 and 1).
Function
Check Triggering Condition:
The system automatically triggers a thread pool status check every 40 processed requests.
Load Judgment Criteria:
The thread pool with the usage rate higher than 80% is judged to be in a high load state.
The thread pool with the usage rate no higher than 80% is judged to be in a low load state.
Scenario Description:
Scenario | Function Description |
Interruption upon multi-blocked threads | Execution Timing: A check is triggered upon each report business submission. Executed Action: When the condition is met, the system will immediately interrupt the blocking thread. |
Interruption upon thread timeout | Execution Timing: A check is triggered by every 40 processed requests.
Executed Action: When the condition is met, the system will interrupt the corresponding thread that timed out. |
Thread pool expansion | Execution Timing: A check is triggered upon each report business submission. Judgement Condition: The system checks if the usage rate of the thread pool exceeds 80% (high load state). Executed Action:
|
Report thread flow control | Execution Timing: A check is triggered upon each report business submission. Judgement Condition: The following three conditions need to be met simultaneously:
Executed Action: The system will perform flow control on report business threads. |
11.0.33 and Earlier Versions
Function Enabling
The steps to enable the Circuit Breaker of Resource Schedule function vary according to different FineReport versions. Select the corresponding steps based on your situation.
FineReport Version | Enabling Procedure |
11.0.29 and Earlier Versions | You need to install the Circuit Breaker of Resource Schedule plugin of V1.4.3 or later versions to enable the Circuit Breaker of Resource Schedule function. You can contact our technical support to download the 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: |
Versions 11.0.30 to 11.0.33 | 1. Log in to the FanRuan application as the admin and choose System Management > System Setting > General. 2. Enable Thread Circuit Breaker in Downtime Prevention Configuration.
Note: |
Function
After the function is enabled, the following conditions take effect automatically.
1. The original HTTP thread pool is replaced with an asynchronous thread pool.
2. Threads are considered to be highly loaded when the CPU load exceeds 80% or when more than 85% threads in the report thread pool are used.
The system will be triggered to detect thread blocking deadlocks and long execution threads every 15 seconds when threads are highly loaded.
If more than three threads are blocked in the same session, session closure will be triggered.
Deadlocked threads (if any) will directly be interrupted. Long execution threads (if any) 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.
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