Creating a critical section in a multi-instance Node.js application in a Kubernetes environment - a step-by-step guide

Recently, I encountered a situation where an interval is set up in Node.js to send periodic emails in a MEAN stack application running on multiple instances in a Kubernetes deployment. However, I noticed that the interval was triggered for all instances simultaneously, causing the same mailer to be sent by each instance. I am looking for a solution where only one instance triggers the mailer at a time. This is new territory for me as I have never dealt with multi-instance deployments of an application before.

node.jskubernetesmean-stackcritical-section

Answer №1

Consider utilizing a Kubernetes cronjob to execute this periodic task efficiently. Your application might require some restructuring to accommodate this change.

An effective approach could involve gathering necessary information and specifying destinations in a message queue or database, such as RabbitMQ, Redis, or an SQL database. Subsequently, the cronjob can be scheduled to dispatch all emails periodically, marking them as sent or removing them from the respective queue or database.

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