Varying Interval Retry
The implemented Node-RED flow showcases the successful integration of a Retry Cloud Pattern with varying intervals to enhance the reliability and fault tolerance of cloud-based applications. By incorporating dynamic retry strategies within the flow, transient failures can be effectively addressed, ensuring seamless operation of cloud-based systems even in challenging scenarios. This implementation serves as a valuable reference for developers seeking to leverage Node-RED in designing resilient and adaptable cloud architectures.
The utilization of retry nodes with varying intervals introduces a level of sophistication to the Retry Cloud Pattern implementation. By dynamically adjusting the retry intervals, the flow intelligently adapts to the changing conditions of the cloud environment. This enables the system to optimize the retry attempts based on factors such as network stability, service availability, and resource availability. As a result, the flow exhibits increased resilience, minimizing the impact of transient failures and enhancing the overall reliability of the cloud-based application.
The successful incorporation of varying intervals in the Retry Cloud Pattern implementation showcases the potential for fine-tuning the retry strategies to align with the specific requirements and constraints of the cloud-based system. This adaptive approach not only improves the system's fault tolerance but also optimizes resource utilization and mitigates excessive retry attempts. By following this exemplary implementation, developers can leverage Node-RED's flexibility and extensibility to design robust cloud architectures capable of withstanding the challenges posed by transient failures.
[{"id":"82686e4920016746","type":"subflow","name":"Varying Interval Retry","info":"","category":"","in":[{"x":120,"y":160,"wires":[{"id":"6ec4235854dd0c41"}]}],"out":[{"x":1380,"y":140,"wires":[{"id":"d8c2072b43f75c90","port":0},{"id":"bc4468a2764edbe2","port":0}]}],"env":[],"meta":{},"color":"#DDAA99"},{"id":"6ec4235854dd0c41","type":"function","z":"82686e4920016746","name":"","func":"msg.delay = msg.retry_interval;\nmsg.retry_counter = 0;\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":260,"y":160,"wires":[["653de01a06106298"]]},{"id":"653de01a06106298","type":"delay","z":"82686e4920016746","name":"","pauseType":"delayv","timeout":"5","timeoutUnits":"milliseconds","rate":"1","nbRateUnits":"1","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"allowrate":false,"outputs":1,"x":420,"y":160,"wires":[["18096c13cd933552"]]},{"id":"18096c13cd933552","type":"http request","z":"82686e4920016746","name":"","method":"GET","ret":"txt","paytoqs":"ignore","url":"","tls":"","persist":false,"proxy":"","insecureHTTPParser":false,"authType":"","senderr":false,"headers":[],"x":570,"y":160,"wires":[["4af1fb2b6c4115da"]]},{"id":"d8c2072b43f75c90","type":"switch","z":"82686e4920016746","name":"if success","property":"statusCode","propertyType":"msg","rules":[{"t":"btwn","v":"200","vt":"num","v2":"299","v2t":"num"},{"t":"else"}],"checkall":"true","repair":false,"outputs":2,"x":920,"y":160,"wires":[[],["bc4468a2764edbe2"]]},{"id":"4af1fb2b6c4115da","type":"function","z":"82686e4920016746","name":"counter increment","func":"msg.retry_counter++;\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":750,"y":160,"wires":[["d8c2072b43f75c90"]]},{"id":"bc4468a2764edbe2","type":"switch","z":"82686e4920016746","name":"if max retries","property":"retry_counter","propertyType":"msg","rules":[{"t":"gte","v":"n_retries","vt":"msg"},{"t":"else"}],"checkall":"true","repair":false,"outputs":2,"x":1070,"y":220,"wires":[[],["8e49f5940f8d2a39"]]},{"id":"8e49f5940f8d2a39","type":"function","z":"82686e4920016746","name":"change interval","func":"msg.delay *= msg.retry_interval_multiplier;\nmsg.retry_interval = msg.delay;\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":1280,"y":220,"wires":[["653de01a06106298","c1eb97959e60060a"]]},{"id":"c1eb97959e60060a","type":"debug","z":"82686e4920016746","name":"debug 9","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":1440,"y":300,"wires":[]}]