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February 22, 2020 21:22
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Kafka Commands List
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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` |
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