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 would like to update the TTL of a specific Kafka topic to 10 days.
How can I do that?
You previously asked about that and I already replied here : Update TTL for a particular topic in kafka using Java
Unless you are asking to do that using Kafka tools? (And not in Java)
In this case there is the kafka-topics.sh command line tool, allowing you to do that using the --alter option.
bin/kafka-topics.sh --alter --zookeeper localhost:2181 --topic test --config retention.ms=10000
Because altering using kafka-topics script could be removed in next release, you should use the kafka-configs script:
bin/kafka-configs.sh --zookeeper localhost:2181 --alter --entity-type topics --entity-name test --add-config retention.ms=5000
I use Ubuntu server 16.04 to try using Kafka. For the command to start a producer and a consumer console I use the following.
producer console :
bin/kafka-console-producer.sh --broker-list localhost:9092 --topic hello-topic
consumer console :
bin/kafka-console-consumer.sh --zookeeper localhost:2181 --from-beginning --topic hello-topic
but the command above only subscribes to one topic. How can I subscribe to multiple topics?
First you should connect with the option bootstrap-server to the Kafka server itself not the zookeeper server.
For multiple topics you use the whitelist option. This will get interpreted as a regular expression and has to get quoted, see Kafka documentation.
So a correct command would be:
kafka-console-consumer.sh --bootstrap-server localhost:9092 --whitelist 'hello-topic|world-topic|another-topic'
Other expressions are also possible, like
kafka-console-consumer.sh --bootstrap-server localhost:9092 --whitelist '.*'
BE AWARE
For convenience we allow the use of ',' instead of '|' to specify a list of topics.
Does not work with Kafka 2.0, perhaps only when mirroring, which I did not try yet.
Hi The actual problem lies in the syntax, from version to verison it keeps on changing.
./kafka-console-consumer.sh --bootstrap-server localhost:9092 --from-beginning --topic muleesb
would work for you
Reason
For kafka versions above kafka_2.11-2.1.0: ./kafka-console-consumer.sh --bootstrap-server IP:PORT --from-beginning --topic TOPIC
For Kafka versions kafka_2.11_0.9.0.0 and below: /kafka-console-consumer.sh --zookeeper IP:PORT —-topic TOPIC --from-beginning --whitelist TOPIC
Exactly one of whitelist/blacklist/topic is required
As mentioned by Harald, use whitelist / blacklist option to include / exclude a set of topics for consumption.
sh kafka-console-consumer.sh --zookeeper localhost:2181 --from-beginning --whitelist Hello,World
I'm using kafka_2.9.2-0.8.1.1 with zookeeper 3.4.6.
Is there a way to change broker configuration settings dynamically? Specifically, I want to change controlled.shutdown.enable
bin/kafka-topics.sh --zookeeper zookeeper01.mysite.com --config controlled.shutdown.enable=true --alter
but I get the error
Missing required argument "[topic]"
No, you can't change broker configs dynamically.
There are two kinds of configurations related to the brokers: broker configs and per-topic configs.
Since per-topic configs are managed by a Zookeeper cluster, you can change those with kafka-topics.sh on the fly.
controlled.shutdown.enable is, however, a broker config which can be only set up by server.properties file and requires broker restarting when to be changed.
This issue was also discussed in Kafka JIRA:
[KAFKA-1229] Reload broker config without a restart
You can now from 1.1 onwards: Dynamic Broker Config
In your case, something like:
> bin/kafka-configs.sh --bootstrap-server localhost:9092 \
--entity-type brokers --entity-name 0 --alter \
--add-config controlled.shutdown.enable=true
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