The Internet of Things (IoT) has recently gained massive traction. IoT challenges enterprises, small companies, and developers with new problems to solve. While HTTP is the de facto protocol for the human web, communication between machines at scale requires a paradigm shift — steering away from request/response and leading toward publish/subscribe. This is where the ultra-lightweight, massively scalable, open, and easy-to-implement MQTT protocol enters the picture.
In this Refcard, we dive into what MQTT is and how it works, including brokers, client libraries, and more.
Introduction
A Channel Interceptor is a means to capture a message before being sent or received in order to view it or modify it. The channel interceptor allows having a structured code when we want to add extra message processing or embed additional data that are basically related to a technical aspect without affecting the business code.
The Message Interceptor is used in frameworks like Spring Cloud Sleuth and Spring Security to propagate tracing and security context through message queue by adding headers to message in the producer part, then reading them and restoring the context in the consumer part.
Despite the fact that Apache Zookeeper’s functionalities are not legitimately noticeable to end-client however it remains as the spine for hyped components like Hadoop to oversee automatic failover, Kafka’s broker coordination, Solr, HBase, Apache S4, and some more.
Besides, Zookeeper is being extensively utilized for many free software projects like AdroitLogic UltraESB, Akka, GoldenOrb (massive-scale Graph analysis), Neo4j(Graph Database), etc. On top of it, many esteemed companies like Yahoo, Rackspace, Box, Midokura, etc. are using it for their operational purpose.
Before expounding the steps to set up multi-node Zookeeper servers/ cluster, should loosen up my thankfulness to all the thriving gatherings beginning from cleaning/sterile social event to Nurses, Doctors and other who are dependably battling to spare the humankind from constant Covid-19 pandemic over the globe.
