Interview Questions.

Question 1. What Is Rabbitmq?

Answer :

RabbitMQ is a messaging dealer or open source message broker software that acts as an middleman with the aid of accepting the message sent by way of the producer as a receiver. RabbitMQ is also known as message-oriented middleware and it implements the Advanced Message Queuing Protocol (AMQP). Erlang programming language is used to write down the RabbitMQ server. RabbitMQ is built at the Open Telecom Platform framework for clustering.

Question 2. What Is A Server In Rabbitmq?

Answer :

The RabbitMQ server is a strong and scalable implementation of an AMQP broking. Running rabbitMQ-server within the foreground shows a banner message, and reports on development within the startup series, concluding with the message "dealer strolling", indicating that the RabbitMQ dealer has been began successfully.

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Question 3. What Is An Exchange In Rabbitmq?

Answer :

An trade in RabbitMQ is a message routing agent that routes the message to unique queues after accepting the same from the manufacturer utility. It routes the messages with the assist of header attributes, bindings, and routing keys.

Question four. What Is “binding” And “routing Key”?

Answer :

A binding in rabbitMQ is a "hyperlink" that one sets up to bind a queue to an exchange.

The routing key's a message characteristic. This is how the routing algorithm is formed - a message is sent to the queues whose binding key exactly suits the routing key of the message.

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Question 5. What Are The Different Types Of Exchanges In Rabbitmq?

Answer :

There are by and large four varieties of exchanges in RabbitMQ:

Direct Exchange
Topic Exchange
Fanout Exchange
Headers Exchange
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Question 6. When Do We Use Dead Letter Exchange In Rabbitmq?

Answer :

If no matching queue can be found for the message, the message can be silently dropped. RabbitMQ offers an AMQP extension called the "Dead Letter Exchange" - the lifeless letter change affords functionality to capture messages that aren't deliverable.

Question 7. What Is Fanout Exchange In Rabbitmq?

Answer :

A fanout exchange in RabbitMQ routes messages to all the queues which are certain to it and it absolutely ignores the routing key.

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Question 8. What Is The Difference Between Topic Exchange And Headers Exchange In Rabbitmq?

Answer :

Topic exchanges are used to direction messages to queues based on wildcard fits between the routing key and the routing sample which in flip is distinctive by way of the queue binding. Based on a matching between a message routing key and this sample, messages are routed to 1 or many queues.

Headers exchanges direction primarily based on arguments containing headers and non-obligatory values. Headers exchanges are very just like subject matter exchanges, however it routes based on header values in place of routing keys. A message is taken into consideration matching if the cost of the header equals the fee detailed upon binding.

Question nine. What Is Direct Exchange In Rabbitmq?

Answer :

Direct Exchange is used for the motive of handing over message to the queue whose binding key exactly matches to message routing key.

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Question 10. Does Kafka Scale Better Than Other Messaging Systems Like Rabbitmq? If Yes, How?

Answer :

There are a few functional variations that make it possible for Apache Kafka to scale higher than RabbitMQ:

Message ordering: RabbitMQ queues are FIFO. In Kafka, you handiest get FIFO in every partition. In different phrases, Kafka best ensures order consistent with-partition. Therefore in this manner you may scale Kafka is via adding more partitions.

Message offset management: the RabbitMQ broker continues song of which messages have already been processed with the aid of clients and deletes them. In Kafka, it’s the duty of the client to manage the offsets: they can be written back to Kafka to a unique topic, or stored absolutely on the patron facet. This permits Kafka to be, in essence, a replicated append-most effective log, that's less difficult to scale than a “stateful” message broking.

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Question 11. What Are Headers Exchange In Rabbitmq?

Answer :

Headers exchange makes use of message header to route message.

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Question 12. What Is Binding In Rabbitmq?

Answer :

It is a link among queue and exchange.

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Question thirteen. What Is Routing Key In Rabbitmq?

Answer :

Routing key is a key that alternate seems to find the binding queue.

Question 14. What Is Erlang? Why Is It Required For Rabbitmq?

Answer :

Erlang is a fashionable-cause, concurrent, useful programming language, as well as a rubbish-amassed runtime gadget. The RabbitMQ server is written inside the Erlang programming language and is constructed on the Open Telecom Platform framework for clustering and failover. Since RabbitMQ is constructed on top of Erlang, we will first need to put in Erlang beforing installing RabbitMQ.