What is difference between MQ and JMS?

MQ can act as a native queue mechanism or a transport for JMS messages. The difference being that JMS messages have some standard header fields at the begining of the message buffer and “native” mq messages contain just the data your program sent to the buffer.

Why Kafka is better than JMS?

Apache Kafka is more suitable to handle a large volume of data due to its scalability and high availability while JMS systems are used when you need to work with multi-node clusters and highly complicated systems

How do I make sure Kafka is running?

Run Kafka Server The Kafka distribution also provide a Kafka config file which is setup to run Kafka single node, and points to ZooKeeper running on localhost:2181 . To run Kafka, we create this script in kafka-training and run it in another terminal window

Is Kafka a JMS?

Kafka and JMS both are messaging system. Java message service is an api which are provided by Java. Apache Kafka is a distributed publish-subscribe messaging system that receives data from disparate source systems and makes the data available to target systems in real time

What happens when Kafka broker goes down?

Kafka does not create a new replica when a broker goes down. If the offline broker was a leader, a new leader is elected from the replicas that are in-sync. When restarting the broker, it will try to get back in sync. Once done, whether it stays a follower or becomes the leader depends if it is the prefered replica

What will happen to the record if default partitioner is used in case of key exists?

In case key exists and default partitioner is used, Kafka will hash the key and use the result to map the message to a specific partition. In each partition, it allows consumers to use Kafka to track their offset position.

What is Kafka written in?


How do I send a message to Kafka topic?

Sending data to Kafka Topics

  1. There are following steps used to launch a producer:
  2. Step1: Start the zookeeper as well as the kafka server.
  3. Step2: Type the command: ‘kafka-console-producer’ on the command line.
  4. Step3: After knowing all the requirements, try to produce a message to a topic using the command:

How do I run Zookeeper on Windows?


  1. Copy and Rename “zoo_sample.cfg” to “zoo.cfg” in C:\Tools\zookeeper-3.4.9\conf.
  2. Create data directory in zookeeper folder.
  3. Find & edit dataDir=/tmp/zookeeper to C:\\Tools\\zookeeper\\zookeeper-3.4.9\\data using any text editor like notepad or notepad++. (
  4. Add entries in System Environment Variables.

Is Kafka stateful or stateless?

Kafka Streams is a java library used for analyzing and processing data stored in Apache Kafka. As with any other stream processing framework, it’s capable of doing stateful and/or stateless processing on real-time data.

What is a Kafka event?

Apache Kafka is a community distributed event streaming platform capable of handling trillions of events a day. Initially conceived as a messaging queue, Kafka is based on an abstraction of a distributed commit log.

Does Kafka key need to be unique?

tl;dr No, a key is not required as part of sending messages to Kafka

Can Kafka run without zookeeper?

You can not use kafka without zookeeper. So zookeeper is used to elect one controller from the brokers. Zookeeper also manages the status of the brokers, which broker is alive or dead. Zookeeper also manages all the topics configuration, which topic contains which partitions etc

What is at least once delivery?

As discussed in some detail in part 1, the at-most-once message delivery approach means that when sending a message from a sender to a receiver there is no guarantee that a given message will be delivered. Any given message may be delivered once or it may not be delivered at all