Apache Kafka - Interview Questions and Answers for 'Apache' | Search Java Interview Question

Apache Kafka - Interview Questions and Answers for 'Apache' - 11 question(s) found - Order By Newest

Q1. Is Apache an application or Web server ?

^Anonymous

Ans. Web server.

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Q2. How to make sure that a string contains only Numerals ?

Core Java

^{Admin
info@buggybread.com}

Ans. We can use NumberUtils.isNumber which is a part of apache commons package.

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Q3. Can we have multiple threads consuming message stream from a single partition ?

Ans. Yes, by having multiple Consumer Groups.

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Q4. Can we have multiple threads consuming messages from a single partition if we have single Consumer Group ?

Ans. No, we can only have max 1 thread per partition in a single Consumer Group.

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Q5. If we have more threads than partitions in a kafka consumer, How can we model it efficiently ?

Ans. We will have to use multiple consumer groups in that case as threads will remain idle if we use single consumer group. A more sophisticated algorithm could be required with multiple groups if we have to ensure the order of consumption.

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Q6. What is Apache Cassandra ?

Cassandra

^{2017-05-22 17:15:23}

Ans. Apache Cassandra is a free and open source distributed NoSQL database management system designed to handle large amounts of data providing high availability with no single point of failure.

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Q7. What is the difference between Java SE Map and Apache Commons MultiMap ? How can we implement functionality similar to multimap using Java SE map ?

Core Java

^{2017-07-23 13:21:10}

Ans. We can have duplicate keys within MultiMap whereas we cannot have duplicate keys within Java Util Map.

We can have a Map with value as a "collection of values" instead of single value to have a similar function as Multimap.

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Q8. How can we make sure that we don't receive duplicate messages from the Kafka Topic ?

Apache Kafka

^{2017-08-17 11:00:15}

^{This question is still unanswered. Can you please provide an answer.}

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Q9. How can we makes sure that message has been consumed properly from Kafka ?

Apache Kafka

^{2017-08-17 15:29:49}

Ans. We can have a mechanism to send the conformation back to Kafka so that Kafka can do offset only after receiving the confirmation.

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Q10. Kafka has a deliver atleast once default Policy, What are the other policies that can be configured with Kafka ?

Apache Kafka

^{2017-08-18 09:39:01}

Ans. Exactly once and At Max Once

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Q11. What are the different delivery policies in Apache Kafka ?

Apache Kafka

^{2018-05-03 06:17:38}

Ans. Exactly once , At least once , At max once

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