I need to add another consumer to my topic to increase the speed. I have seen the documentation here and can use
bin/kafka-topics.sh --bootstrap-server broker_host:port --alter --topic my_topic_name --partitions 2
but can I do it directly while the messages arrive?
In order to delete all of the data in a topic I set the retention.ms config of it to 1000.
./bin/kafka-topics.sh --zookeeper $KAFKAZKHOSTS --alter --topic <topic> --config retention.ms=1000
This worked fine. All the data was deleted after a very short wait.
Before altering the config, the retention.ms was not set on the topic and so the server default property log.retention.hours=168 was the previous retention policy. (log.retention.minutes and log.retention.ms had not been set in the server properties).
Now I would like to remove the retention.ms config from this topic completely and go back to using the server level config.
Commands like
./bin/kafka-topics.sh --zookeeper $KAFKAZKHOSTS --alter --topic <topic> --config retention.ms=
or
./bin/kafka-topics.sh --zookeeper $KAFKAZKHOSTS --alter --topic <topic> --config retention.ms=null
throw an error.
I know that the delete option for kafka-topics.sh actually deletes the entire topic, so I'm not going to try play around with that.
Question: How do I completely remove a topic level config so that the topic reverts to using the server default?
To remove a topic configuration override, you can use the kafka-config tool. For example:
./bin/kafka-configs.sh --zookeeper <zookeeper> --alter \
--entity-type topics --entity-name <topic> --delete-config retention.ms
Another traditional solution which I used is manually deleting the particular folder for particular topic.
First stop the kafka server
Go to /var/lib/kafka/data (where your kafka data ios being stored specifies by you at the time of installation)
rm -rf /var/lib/kafka/data/yourTopicName-0
I was trying to get the config for one of the kafka clusters we have. After doing a config change through puppet, I want to know if kafka has reloaded the config, or if we need to restart the service for that.
I have tried with ./kafka-configs.sh --describe --zookeeper my-zookeeper:2181 --entity-type brokers but I only have empty output.
I have also tried to find for the config browsing inside the zookeepers but i have found nothing.
Is there any way to retrieve which config is being used?
Here's full working command to list all configs for the broker with id=1:
./bin/kafka-configs.sh --bootstrap-server <broker-host>:9092 --entity-type
brokers --entity-name 1 --all --describe
as suggested #LijuJohn i found the config in the server.log file. Thanks a lot!!
Since Kafka 2.5.0 (see issue here), you can now specify the --all flag to list all configs (not just the dynamic ones) when using ./kafka-configs.sh
Have you tried with parameter --entity-name 0 where 0 is the id of the broker?
This is required at least for my cluster.
On CentOS7, kafka version:3.3.2
Should be able to find all the configurations via:
bin/kafka-configs.sh --describe --bootstrap-server <advertised.listeners>:9092 --entity-type brokers --entity-name <broker-id> --all
#example:
bin/kafka-configs.sh --describe --bootstrap-server localhost:9092 --entity-type brokers --entity-name 0 --all
Note:
Both <advertised.listeners> and could be found in config/server.properties
Is this any bug with the Apache Kafka 0.9.0.0? I'm using the following command to list the topics and I get nothing even though the server was started with a topic being created!
Joes-MacBook-Pro:kafka_2.11-0.9.0.0 joe$ bin/kafka-topics.sh --list --zookeeper localhost:2181
Joes-MacBook-Pro:kafka_2.11-0.9.0.0 joe$
Here is the command that I used to start Apache Kafka:
bin/kafka-server-start.sh config/server.properties & bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic test_topic
It is getting harsh for me to just try out the basic stuff around the much hyped Apache Kafka. Here is one another example where I'm pretty much stuck!
Apache Kafka 0.9.0.0 Show all Topics with Partitions
I don't see the zookeeper started in your code.
Please start zookeeper and then kafka in the same order.
bin/zookeeper-server-start.sh config/zookeeper.properties &
bin/kafka-server-start.sh config/server.properties &
Try to list the topics with the below command.
bin/kafka-topics.sh --list --zookeeper localhost:2181
You can create the topic with the below command
bin/kafka-topics.sh --zookeeper localhost:2181 --create --topic test --partitions 1 --replication-factor 1
Once the topic is created, you get a message saying "test" created.
Now you can try list command to see your topic listed.
Note: The replication factor depends upon the number of brokers that you run on a single server.
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