How do I get a list of Kafka topics?

TopicCommand is a command-line tool that can alter, create, delete, describe and list topics in a Kafka cluster. TopicCommand can be executed using kafka-topics shell script (i.e. bin/kafka-topics.sh or bin\windows\kafka-topics. bat ). $ ./bin/kafka-topics.sh Create, delete, describe, or change a topic.

How can I listen to Kafka topics in Java?

Following is a step by step process to write a simple Consumer Example in Apache Kafka.

1. Create Java Project.
2. Add Jars to Build Path.
3. New SampleConsumer Thread.
4. Properties of Kafka Consumer.
5. Create Kafka Consumer with the Properties.
6. Subscribe Consumer to a Topic.
7. Fetch Records for the Topic.
8. Consume the records.

How can I see my Kafka topic partitions?

1. Stream kafka-topics describe output for the given topics of interest.
2. Extract only the first line for each topic which contains the partition count and replication factor.
3. Multiply PartitionCount by ReplicationFactor to get total partitions for the topic.
4. Sum all counts and print total.

Where are topics stored in Kafka?

By default on Linux it is stored in /tmp/kafka-logs . If you will navigate to this folder you will see something like this: recovery-point-offset-checkpoint. replication-offset-checkpoint.

How do I change a topic in Kafka?

You just execute the following command against the topic of your choice: bin/kafka-topics.sh –zookeeper zk_host:port –alter –topic –partitions . Remember, Kafka only allows increasing the number of partitions, because decreasing it would cause in data loss.

How do you create a topic?

Develop a Topic and Create a Concept Map

1. Write down your topic as a broad sentence or question.
2. Identify the main words or concepts in your sentence or question.
3. Brainstorm alternative words you can use for each of your keywords in Step 2.
4. Identify subject areas relevant to your topic.
5. Create a Concept Map.

How do you create a topic in Kafka?

1. Use the following command to create a topic named test : ./bin/kafka-topics.sh –zookeeper zookeeper1:2181/kafka –create –topic test –replication-factor 1 –partitions 3.
2. Use the following command to describe the topic: ./bin/kafka-topics.sh –zookeeper zookeeper1:2181/kafka –topic test –describe.

How do I get data from Kafka topic?

The main way we scale data consumption from a Kafka topic is by adding more consumers to a consumer group. It is common for Kafka consumers to do high-latency operations such as write to a database or a time-consuming computation on the data.

How do I get Kafka broker list?

Alternate way using Zk-Client:

1. Run the Zookeeper CLI: $ zookeeper/bin/zkCli.sh -server localhost:2181 #Make sure your Broker is already running.
2. If it is successful, you can see the Zk client running as:

How do I create a Kafka topic with partitions?

How topics are stored in Kafka?

Kafka topics are partitioned, meaning a topic is spread over a number of “buckets” located on different brokers. This distributed placement of your data is very important for scalability because it allows client applications to read the data from many brokers at the same time.

How many topics can be created in Kafka?

The rule of thumb is that the number of Kafka topics can be in the thousands. Jun Rao (Kafka committer; now at Confluent but he was formerly in LinkedIn’s Kafka team) wrote: At LinkedIn, our largest cluster has more than 2K topics. 5K topics should be fine.