I am looking for a way to delete a topic or all its messages using kafkacat.
Is it possible or the only way is through the script listed here?
bin/kafka-topics.sh --zookeeper localhost:2181 --delete --topic mytopic
There is no delete topic feature at this stage in kafkacat according to man page and github source code. So the only way is to use kafka-topics script.
github source code
man page
kafkacat is a generic non-JVM producer and consumer for Apache Kafka
0.8, think of it as a
netcat for Kafka.
In producer mode ( -P ), kafkacat reads messages from stdin, delimited with a configurable
delimeter and produces them to the provided Kafka cluster, topic and partition. In consumer
mode ( -C ), kafkacat reads messages from a topic and partition and prints them to stdout
using the configured message delimiter.
If neither -P or -C are specified kafkacat attempts to figure out the mode automatically
based on stdin/stdout tty types.
kafkacat also features a metadata list mode ( -L ), to display the current state of the
Kafka cluster and its topics and partitions.
As #Naween Banuka pointed out, you can also use zookeeper-shell.sh or zkCli.sh (found under zookeeper/bin) to do this:
List the existing topics : ./zookeeper-shell.sh localhost:2181 ls /brokers/topics
Remove Topic : ./zookeeper-shell.sh localhost:2181 rmr /brokers/topics/yourtopic
Yes, It's possible.
But first, You have to enable topic deletion on all brokers.
change delete.topic.enable to true.
By default, it's false (In server.properties file)
Then,
Use topic delete command.
bin/kafka-topics.sh --zookeeper localhost:2181 --delete --topic mytopic
If you want to delete that topic permanently,
You can use the zookeeper delete command.
List the existing topics : ./zookeeper-shell.sh localhost:2181 ls /brokers/topics
Remove Topic : ./zookeeper-shell.sh localhost:2181 rmr /brokers/topics/yourtopic
$ kafka-topics --zookeeper localhost:2181 --list | grep my-topic
my-topic
$ kafka-topics --zookeeper localhost:2181 --delete --topic my-topic
Topic my-topic is marked for deletion.
Note: This will have no impact if delete.topic.enable is not set to true.
$ kafka-topics --zookeeper localhost:2181 --list | grep my-topic
my-topic - marked for deletion
It's been hours since then, and the topic has still not been deleted.
I've seen suggestions that I should put delete.topic.enable in my server.properties and restart kafka. I've tried this. It hasn't worked.
$ grep -F delete.topic.enable /usr/local/etc/kafka/server.properties
delete.topic.enable = true
(Why wouldn't this be set by default?)
In any case, these suggestions have all been for kafka 0.* and I am on a newer version.
$ brew list --versions kafka
kafka 1.1.0
How do I delete topics?
I can shutdown kafka and zookeeper, run rm -r /usr/local/var/lib/kafka-logs /usr/local/var/run/zookeeper/data, then start zookeeper and kafka again. But this is rather drastic. Surely there should be some way of persuading kafka-topics to actually delete a topic?
The command you're using is the recommended way to delete a topic.
Unfortunately there are a few reasons why a topic can stay stuck in "marked for deletion" state.
If you check the controller logs, you might see why it's not able to delete it. In the controller logs, all lines from the Deletion Manager are prefixed with Topic Deletion Manager.
Periodically, you should see messages like Handling deletion for topics .... In case the controller has given up the deletion, it should have logged it, with this format: Halted deletion of topics ....
If you want to force the deletion, you can try:
Deleting the topic details in Zookeeper. Using zookeeper-shell.sh, run rmr /brokers/topics/TOPIC_NAME
Bouncing the controller
Finally if none of this works, you can, as hinted, delete the log data on disk/
On the suggestion of a colleague, I
shut down Kafka and Zookeeper
added the line listeners=PLAINTEXT://127.0.0.1:9092 to /usr/local/etc/kafka/server.properties
restarted Zookeeper and Kafka
Now I can delete topics again. I don't know why this should work, but suspect it is related to a recent macOS upgrade.
even after enabling delete.topic.enable=true in server.config
deletion of topics not working . i am getting following error on recreating the topic again
Topic 'test' already exists.
[2017-05-23 06:47:05,757] ERROR
org.apache.kafka.common.errors.TopicExistsException: Topic 'test' already exists.
You can not delete a topic when consuming it. Use bin/kafka-consumer-groups.sh or simple ps -aux|grep Consumer to find any possible consumers which block the operation.
remove meta data in zookeeper
./bin/zookeeper-shell.sh localhost:2181
rmr /brokers/topics/mytopic
rmr /admin/delete_topics/mytopic
If you use the latest Kafka (v. ~0.10.) then after you enabled the delete.topic.enable=true option you have to:
Restart Kafka
Delete topic:
kafka-topics.sh --zookeeper localhost:2181 --topic mytopic --delete
Check that it was marked for deletion:
kafka-topics.sh --zookeeper localhost:2181 --list
mytopic - marked for deletion
And wait a bit.
And if you use some old version of Kafka, then try to delete the topic from a zookeeper-shell.
If the zookeeper is a standalone instance (not on the localhost), mark for deletion of topics won't delete it properly.
One suggestion would be to use Zookeeper Exhibitor & delete it from admin & brokers.
Exhibitor give a UI interface to visualise how the topics & kafka brokers are arranged.
I have marked 3 topics for deletion using this command
kafka-topics --zookeeper localhost:2181 --delete --topic topic_name
Now I can't use them neither I can recreate them how to resolve this issue ?
Either to delete them totally then recreate them or unmark the status for deletion.
Yes, you can restore it if not yet deleted!
Login to zookeeper prompt and use rmr path command:
sudo ./zookeeper-shell.sh localhost:2181
rmr /admin/delete_topics/topic_name
Did you list and see whether those topics are there? In order to list:
kafka-topics.sh --list --zookeeper localhost:2181
Deleting a topic is supported since 0.8.2.x. You will need to enable topic deletion (setting delete.topic.enable to true) on all brokers first.
Make sure you've done the change in the broker config file and then try deleting the topics.
Ref: Is it possible to delete a topic
I'm not sure whether you'll be able to unmark the ones you've marked for deletion. As far as I know you'd be able to delete it totally and recreate them.
I need to delete the topic test in Apache Kafka 0.8.1.1.
As expressed in the documentation here, I have executed:
bin/kafka-topics.sh --zookeeper localhost:2181 --delete --topic test
However, this results in the following message:
Command must include exactly one action: --list, --describe, --create or --alter
How can I delete this topic?
Deleting topic isn't always working in 0.8.1.1
Deletion should be working in the next release, 0.8.2
kafka-topics.sh --delete --zookeeper localhost:2181 --topic your_topic_name
Topic your_topic_name is marked for deletion.
Note: This will have no impact if delete.topic.enable is not set to true.
You may also pass in a bootstrap server instead of zookeeper:
kafka-topics.sh --bootstrap-server kafka:9092 --delete --topic your_topic_name
Is it possible to delete a topic?
Jira KAFKA-1397
It seems that the deletion command was not officially documented in Kafka 0.8.1.x because of a known bug (https://issues.apache.org/jira/browse/KAFKA-1397).
Nevertheless, the command was still shipped in the code and can be executed as:
bin/kafka-run-class.sh kafka.admin.DeleteTopicCommand --zookeeper localhost:2181 --topic test
In the meantime, the bug got fixed and the deletion command is now officially available from Kafka 0.8.2.0 as:
bin/kafka-topics.sh --delete --zookeeper localhost:2181 --topic test
Add below line in ${kafka_home}/config/server.properties
delete.topic.enable=true
Restart the kafka server with new config:
${kafka_home}/bin/kafka-server-start.sh ~/kafka/config/server.properties
Delete the topics you wish to:
${kafka_home}/bin/kafka-topics.sh --delete --zookeeper localhost:2181 --topic daemon12
Andrea is correct. we can do it using command line.
And we still can program it, by
ZkClient zkClient = new ZkClient("localhost:2181", 10000);
zkClient.deleteRecursive(ZkUtils.getTopicPath("test2"));
Actually I do not recommend you delete topic on Kafka 0.8.1.1. I can delete this topic by this method, but if you check log for zookeeper, deletion mess it up.
Steps to Delete 1 or more Topics in Kafka
#To delete topics in kafka the delete option needs to be enabled in Kafka server.
1. Go to {kafka_home}/config/server.properties
2. Uncomment delete.topic.enable=true
#Delete one Topic in Kafka enter the following command
kafka-topics.sh --delete --zookeeper localhost:2181 --topic <your_topic_name>
#To Delete more than one topic from kafka
(good for testing purposes, where i created multiple topics & had to delete them for different scenarios)
Stop the Kafka Server and Zookeeper
go to server folder where the logs are stored (defined in their config files) and delete the kafkalogs and zookeeper folder manually
Restart the zookeeper and kafka server and try to list topics,
bin/kafka-topics.sh --list --zookeeper localhost:2181
if no topics are listed then the all topics have been deleted successfully.If topics are listed, then the delete was not successful. Try the above steps again or restart your computer.
You can delete a specific kafka topic (example: test) from zookeeper shell command (zookeeper-shell.sh). Use the below command to delete the topic
rmr {path of the topic}
example:
rmr /brokers/topics/test
This steps will delete all topics and data
Stop Kafka-server and Zookeeper-server
Remove the data directories of both services, by default on windows they are
C:/tmp/kafka-logs and C:/tmp/zookeeper.
then start Zookeeper-server and Kafka-server
The command:
bin/kafka-topics.sh --delete --zookeeper localhost:2181 --topic test
unfortunately only marks topic for deletion.
Deletion does not happen.
That makes troubles, while testing any scripts, which prepares Kafka configuration.
Connected threads:
Purge Kafka Queue
Is there a way to delete all the data from a topic or delete the topic before every run?
As mentioned in doc here
Topic deletion option is disabled by default. To enable it set the server config
delete.topic.enable=true
Kafka does not currently support reducing the number of partitions for a topic or changing the replication factor.
Make sure delete.topic.enable=true
Adding to above answers one has to delete the meta data associated with that topic in zookeeper consumer offset path.
bin/zookeeper-shell.sh zookeeperhost:port
rmr /consumers/<sample-consumer-1>/offsets/<deleted-topic>
Otherwise the lag will be negative in kafka-monitoring tools based on zookeeper.
First, you run this command to delete your topic:
$ bin/kafka-topics.sh --delete --bootstrap-server localhost:9092 --topic <topic_name>
List active topics to check delete completely:
$ bin/kafka-topics.sh --list --bootstrap-server localhost:9092
If you have issues deleting the topics, try to delete the topic using:
$KAFKA_HOME/bin/kafka-topics.sh --delete --zookeeper localhost:2181 --topic your_topic_name
command. Then in order to verify the deletion process, go to the kafka logs directory which normally is placed under /tmp/kafka-logs/, then delete the your_topic_name file via rm -rf your_topic_name command.
Remember to monitor the whole process via a kafka management tool like Kafka Tool.
The mentioned process above will remove the topics without kafka server restart.
There is actually a solution without touching those bin/kafka-*.sh: If you have installed kafdrop, then simply do:
url -XPOST http://your-kafdrop-domain/topic/THE-TOPIC-YOU-WANT-TO-DELETE/delete
bin/kafka-topics.sh --delete --zookeeper localhost:2181 --topic <topic-name>
Step 1: Make sure you are connected to zookeeper and Kafka running
Step 2: To delele the Kafka topic run kafka-topics script, add the port and --topic with name of your topic and --delete it just delete the topic with success.
# Delete the kafka topic
# it will delete the kafka topic
bin/kafka-topics.sh --zookeeper 127.0.0.1:2181 --topic name_of_topic --delete
This worked for me:
kafka-topics --delete --bootstrap-server localhost:9092 --topic user-commands
I am using Confluent CLI and run this on the directory I installed it.
Recent Kafka versions are about to remove the Zookeeper dependency. Therefore, you should instead reference the brokers (through --boostrap-server):
kafka-topics \
--bootstrap-server localhost:9092,localhost:9093,localhost:9094 \
--delete \
--topic topic_for_deletion
for confluent cloud use -
$ confluent kafka topic delete my_topic