Introduction of Apache Kafka
In the present scenario, the Apache Kafka is attracting a lot of aspirants. It is generating wide career opportunities for them aspirants, for which they are diligently preparing. In this article, we bring some very common Apache Kafka Interview Questions and Answers, which you may prepare well; however the list is not exhaustive.
Q. What do you mean by Apache Kafka?
Ans. The Apache Kafka is a messaging application, which was coded in Scala. This project was conceived and initiated by the Apache software. The design pattern of Kafka is largely based on the designs of transactional logs in ITIL Specialist Create, Deliver and Support Course .
Q. Enumerate the various of components in Kafka.
Ans. Following are the components in Kafka:
1.Topic –Kafka Topic is the collection of messages.
2.Producer –Producers issue communications and publish messages to the topic.
iii. Consumer –The Consumers reach the topics and read and process the messages from the topics.
iv.Brokers – Brokers are responsible for managing storage of the messages.
Q. What is the role of the offset.
Ans. An offset is an ID number provided to the messages that parts them in a sequence . Basically, theirs job is to identify each message distinctly.
Q. What is a Consumer Group?
Ans. Each and every consumer group is made of one or more consumers. They commonly consume a set of subscribed topics.
Q. What is a Zookeeper?
Ans. A Zookeeper has unique role in Apache Kafka,where it is responsible for establishing coordination between different nodes in a cluster. The Zookeeper is also used to restore from any prior offset where any node fails.
Q. Can we use Kafka without Zookeeper?
Ans. It is totally impossible to use Kafka without Zookeeper. The client request cannot be accessed , even if the Zookeeper is down. Thus, the Zookeeper is an important prerequisite of Kafka.
Q. State the important advantages of the Kafka Technology.
Ans. The Kafka technology is getting more important in usage due to a lotbof advantage it carries. Following are some of the advantages of the Kafka technology:
1.High-throughput- The Kafka is responsible for handling high-velocity and high-volume data. It is responsible for extending support message throughput . Thus it is responsible for high throughput.
2.Low Latency- The technology of Kafka is responsible for the swift handling of messages with the very low latency of the range of milliseconds. This makes it very significant in usage.
3.Fault-Tolerant-Kafka is immune to the failure of node or machine failure in a cluster.
4.Durability- The technology is very durable in nature. It is because, the Kafka substantiates the replication of messages. It is for this reason, the messages are never ever lost. This is undoubtedly a big advantage.
5.Scalability- The best part about Kafka is,that it can be scale. This can be done even without carrying any downtime on the fly by annexing the additional nodes.
Q. List the important APIs of Kafka?
Ans. The Apache Kafka has 4 main APIs, namely,
- Producer API
- Consumer API
- Streams API
- Connector API
Q. Why are Replications critical in Kafka?
Ans. The Replication indicate that the published messages are not lost. They can be consumed in the case of any machine error, program error or frequent software upgrades.
Q. If a Replica stays out of the ISR for a long time, what does it indicate?
Ans. If a Replica stays out of the ISR for a longer period of time, it indicates that the Follower cannot fetch data as fast as data accumulated by the Leader.
Q. What is responsible for load balancing of the server in Kafka?
Ans. The Leader is required to perform the task of all read and write requests for the partition. On the other hand, the Followers replicate the leader, in a part. In a case, where the of Leader fails, one of the Followers plays the role of the Leader. Thus, this process is responsible for load balancing of the servers.
Q. What do you mean by the Replicas and the ISR?
Ans. Replica can be referred to a list of nodes , for specific partition,that replicate the log. The ISR stands for In-Sync Replicas. The ISR a set of message replicas that are synced to the leaders.
Conclusion
As already mentioned, the list of the above questions and their answers are not exhaustive, but are inclusive.Thus,we recommend you to practice as many questions and make your answer making strategies really unique to excel in the interview in ITIL Specialist.
