In this post we will look at RabbitMQ Interview questions and answers. Below are some Examples provided with explanations.
Question#1 Which of the following is the component that routes messages to queues?
Question#2 RabbitMQ server is written using?
Question#3 Which of the following exchange is pre-declared if no exchange is declared?
i) Direct Exchange
ii) Topic Exchange
iii) Default Exchange
iv) Header Exchange
Answer# Default Exchange
Question#4 Which of the following is the client library for Node.js to integrate with RabbitMQ?
Question#5 RabbitMQ server is an open source implementation of?
i) AMQP protocol
ii) DDS protocol
iii) MQTT protocol
iv) CoAP protocol
Answer# AMQP protocol
Question#6 Using ConnectionFactory Connection is created using built in method
Question#7 Which of the following exchange routes messages to queues by ignoring the routing key?
i) Topic Exchange
ii) Fanout Exchange
iv) Direct Exchange
Answer# Fanout Exchange
Question#8 Which of the following is the buffer that stores messages sent by the producer?
Question#9 Which of the following is the virtual connection inside a connection?
Question#10 What is the default port of the RabbitMQ management interface?
Question#11 Which of the following built-in channel method declares a queue?
Question#12 Using Connection channel can be created using builtin method
Question#13 Queues that are deleted after performing a task are called?
i) Exclusive Queues
iii) Auto Delete Queues
Question#14 Which property of a channel is used to display acknowledge details?
Question#15 Which of the following parameter is provided to the nextDelivery() method and specifies the time to wait for the next delivery message?
Question#16 Using Channel message can be consumed using builtin method
Question#17 Using Channel message can be published using builtin method
Question#18 Pika is the RabbitMQ client library for?
Question#19 Which of the following tag allows a user to access only the management plugin?
Question#20 Expiry time for a queue is set by assigning which property?
iii) Auto expire
iv) Auto delete
Answer# Auto expire
Question#21 Which of the following command creates a user Jim and password root?
i) rabbitmqctl add_user jim root
ii) rabbitmqctl add_user root jim
iii) rabbitmqctl add jim root
iv) rabbitmqctl user jim root
Answer# rabbitmqctl add_user root jim
Question#22 The default SASL method supported by RabbitMQ is?
Question#23 In spring AMPQ, which of the following class enables to publish messages?
Question#24 Which of the following property assigned to a queue specifies the queue survival time?
Question#25 Which of the following is the permission required to create a resource?
Question#26 By default, nodes in a cluster are created as DISK nodes.
Question#27 Using Channel binding can be done using builtin method
Question#28 Which of the following exchange has the routing key as a list of words?
i) Header Exchange
iii) Fanout Exchange
iv) Topic Exchange
Answer# Topic Exchange
Question#29 Which of the following command deletes user Jim?
i) rabbitmqctl.bat delete_user Jim
ii) rabbitmqctl.bat remove Jim
iii) rabbitmqctl.bat delete Jim
iv) rabbitmqctl.bat remove_user Jim
Answer# rabbitmqctl.bat delete Jim
Question#30 Which of the following is the command to delete quiz Vhost?
i) rabbitmqctl.bat remove_vhost events
ii) rabbitmqctl.bat delete_vhost quiz
iii) rabbitmqctl.bat remove_vhost quiz
iv) rabbitmqctl.bat delete events
Answer# rabbitmqctl.bat delete_vhost quiz
Question#31 In a remote procedure call, what is the unique identifier assigned to every request message?
iii) Routing key
What is RabbitMQ ?
RabbitMQ is an open source message broker software (sometimes called message-oriented middleware) that implements the Advanced Message Queuing Protocol (AMQP). The RabbitMQ server is written in the Erlang programming language and is built on the Open Telecom Platform framework for clustering and failover.
What is Advanced Message Queuing Protocol (AMQP) ?
The Advanced Message Queuing Protocol (AMQP) is an open standard application layer protocol for message-oriented middleware. AMQP 0-9-1 is a binary messaging protocol and semantic framework for microservices and enterprise messaging. RabbitMQ is based on AMQP 0-9-1 Protocol. RabbitMQ supports –
- AMQP 0-9-1
- AMQP 1.0
RabbitMQ Messaging Flow- Bindings are what connects the exchanges to queues.
What is an exchange in RabbitMQ?
An exchange accepts messages from the producer application and routes them to message queues with help of header attributes, bindings, and routing keys. A binding is a “link” that you set up to bind a queue to an exchange.
What is routing key in RabbitMQ?
The routing key is a message attribute. The routing algorithm behind a direct exchange is simple – a message goes to the queues whose binding key exactly matches the routing key of the message.
What is Erlang ? Why is it required for RabbitMQ ?
Erlang is a general-purpose, concurrent, functional programming language, as well as a garbage-collected runtime system. The RabbitMQ server is written in the Erlang programming language and is built on the Open Telecom Platform framework for clustering and failover. Since RabbitMQ is built on top of Erlang, we will first need to install Erlang beforing installing RabbitMQ
How to install RabbitMQ?
How to integrate RabbitMQ with Spring Boot?
What is Spring Cloud Stream? What is the need for it?
In previous examples we had implemented examples for integrating Spring Boot Applications with Messaging Systems like Apache Kafka and RabbitMQ. If you look at these examples these required a lot of configuration code which was Broker specific. For example in case of RabbitMQ integration with Spring Boot we had to write code to create AmqpTemplate Template and Bindings. So if tomorrow the Messaging System changes we will also need to make application code changes.
Spring Cloud helps solve this problem using Spring Cloud Stream. Using Spring Cloud Stream we can develop applications where we do not need to specify the implementation details of the messaging system we want to use. We just need to specify the required binding dependencies and Spring Cloud Stream will the integrate the messaging systems to Spring Boot Application.
Spring Cloud Stream Tutorial – Publish Message to RabbitMQ Simple Example
Spring Cloud Stream Tutorial – Consume Message from RabbitMQ Simple Example
What are the types of exchanges available in RabbitMQ?
There are 4 types of exchanges available in RabbitMQ.
- Direct – Based on the routing key a message is sent to the binding queue having the same routing key. The routing key of exchange and the binding queue have to be an exact match.
- Fanout – The message is routed to all the available bounded queues. The routing key if provided is completely ignored. So this is a kind of publishe-subscribe design pattern.
- Topic – Here again the routing key is made use of. But unlike in direct exchange type, here the routing key of the exchange and the bound queues should not necessarily be an exact match. Using regular expressions like wildcard we can send the exchange to multiple bound queues.
- Headers – In this type of exchange the routing queue is selected based on the criteria specified in the headers instead of the routing key. This is similar to topic exchange type, but here we can specify complex criteria for selecting routing queues.
Does RabbitMQ have any concept of message priority?
RabbitMQ does have concept of priority-
- We can define the queue’s priority range at the time the queue is created
- Messages where priority is not set get a priority of 0
- Messages with a numeric priority higher than the maximum set on the queue get the highest priority the queue supports
What is STOMP?
STOMP is a simple text-oriented messaging protocol used by our UI Client(browser) to connect to enterprise message brokers.
Clients can use the SEND or SUBSCRIBE commands to send or subscribe for messages along with a “destination” header that describes what the message is about and who should receive it.
It defines a protocol for clients and servers to communicate with messaging semantics. It does not define any implementation details, but rather addresses an easy-to-implement wire protocol for messaging integrations. The protocol is broadly similar to HTTP, and works over TCP using the following commands:
How to implement Chat Application using Spring Boot + WebSocket + RabbitMQ?
Build a Chat Application using Spring Boot + WebSocket + RabbitMQ
Build a web chat using Spring Boot and WebSocket.
How to implement Retry and Error Handling for RabbitMQ?
Spring Boot + RabbitMQ Tutorial – Retry and Error Handling Example
In this tutorial we will be implementing a Spring Boot + RabbitMQ example to retry messages on exception and if exception still exists after maximum retries then put message in a dead letter queue where it can be analyzed and corrected later.