I am trying to learn Kafka,
This is the command I saw for topic creation.
bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partition 2 --topic test
why do we pass zookeeper host,port for topic creation, instead to broker(s) information?
what does zookeeper do with topic?
Does topic info is persisted in zookeeper
Which Kafka version are you using? In the latest version, the --zookeeper parameter is deprecated and you can use the --bootstrap-server instead, providing Kafka broker(s) address(s).
Anyway, the topic information will be still stored in Zookeeper. This is the way how Kafka works.
The fact that --zookeeper is deprecated is because the development is going in the direction of making clients less aware of Zookeeper and doing all the operations connecting to the Kafka brokers; it's the broker doing the operation on Zookeeper then.
$ 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.
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'm using Kafka 0.8.0, it's Cloudera version.
When I deleted the topic such as: kafka-topics --zookeeper 10.0.0.11:2181/ --delete --topic test
it response:
Topic test is already marked for deletion.
But afterwards I recreated it, it throw exception as following:
kafka-topics --create --zookeeper 10.0.0.11:2181 --partitions 90 --replication-factor 2 --topic test
Error while executing topic command Topic "test" already exists.
kafka.common.TopicExistsException: Topic "test" already exists.
Any ideas please? How should I delete the topic and it's data.
My Kakfa version is kafka_2.10-0.8.2.2, below link works for me (from Delete topic in Kafka 0.8.1.1)
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
More information from Kafka FAQ:
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 that, In kafka's config.poperties file 'delete.topic.enable' property should be true.
use below command
bin/kafka-topics.sh --delete --zookeeper localhost:2181 --topic test
Even if topic is not deleted then follow next steps.
open terminal zookeeper client mode:
A. stop zookeeper
B. rmr /broker/topics
C. check given topic using below command
/bin/kafka-topics.sh --zookeeper maxiq:2181 --list
If delete.topic.enable is set to false by default, the topics are not deleted on execution of --delete command (as displayed in the command response).
Topic test is marked for deletion.
Note: This will have no impact if delete.topic.enable is not set to true.
In order to overcome this, use steps mentioned by #Shawn
The best and easy to make delete.topic.enable=true is not modify the server.property file.
Because, if kafka restart from ambari, it will overwrite this file, delete.topic.enable =false again.
Only at ambari, click on kafak/config/advance kafka broker/delete.topic.enable =true, it will work.
I just found that out as now.
Delete topic in kafka
step 1 -->> cd /usr/lib/zookeeper/bin
step 2 -->> zkCli.sh -server 127.0.0.1:2181
step 3 -->>rmr /brokers/topics/topic_name
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