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Kafka-cheatsheet.md

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Kafka Topics

List existing topics

bin/kafka-topics.sh --zookeeper localhost:2181 --list

Describe a topic

bin/kafka-topics.sh --zookeeper localhost:2181 --describe --topic mytopic

Purge a topic

bin/kafka-topics.sh --zookeeper localhost:2181 --alter --topic mytopic --config retention.ms=1000

... wait a minute ...

bin/kafka-topics.sh --zookeeper localhost:2181 --alter --topic mytopic --delete-config retention.ms

Delete a topic

bin/kafka-topics.sh --zookeeper localhost:2181 --delete --topic mytopic

Get number of messages in a topic ???

bin/kafka-run-class.sh kafka.tools.GetOffsetShell --broker-list localhost:9092 --topic mytopic --time -1 --offsets 1 | awk -F ":" '{sum += $3} END {print sum}'

Get the earliest offset still in a topic

bin/kafka-run-class.sh kafka.tools.GetOffsetShell --broker-list localhost:9092 --topic mytopic --time -2

Get the latest offset still in a topic

bin/kafka-run-class.sh kafka.tools.GetOffsetShell --broker-list localhost:9092 --topic mytopic --time -1

Consume messages with the console consumer

bin/kafka-console-consumer.sh --new-consumer --bootstrap-server localhost:9092 --topic mytopic --from-beginning

Get the consumer offsets for a topic

bin/kafka-consumer-offset-checker.sh --zookeeper=localhost:2181 --topic=mytopic --group=my_consumer_group

Read from __consumer_offsets

Add the following property to config/consumer.properties: exclude.internal.topics=false

bin/kafka-console-consumer.sh --consumer.config config/consumer.properties --from-beginning --topic __consumer_offsets --zookeeper localhost:2181 --formatter "kafka.coordinator.GroupMetadataManager\$OffsetsMessageFormatter"

Kafka Consumer Groups

List the consumer groups known to Kafka

bin/kafka-consumer-groups.sh --zookeeper localhost:2181 --list (old api)

bin/kafka-consumer-groups.sh --new-consumer --bootstrap-server localhost:9092 --list (new api)

View the details of a consumer group

bin/kafka-consumer-groups.sh --zookeeper localhost:2181 --describe --group <group name>

kafkacat

Getting the last five message of a topic

kafkacat -C -b localhost:9092 -t mytopic -p 0 -o -5 -e

Zookeeper

Starting the Zookeeper Shell

bin/zookeeper-shell.sh localhost:2181