I was using a kafka topic, and it's metadata as well in my application. I hard deleted the topic from the zookeeper shell, by deleting the directories corresponding to that topic. After creating the topic again, I described the topic and found that no leaders have been assigned to this newly created topic. In the consumer, I can see repeated logs printing LEADER_NOT_AVAILABLE. Any reason as to what am I doing wrong? Or maybe is there a way to delete the metadata related to the kafka topic as well that I'm unaware of? Thanks in advance!
Deleting topics in Kafka hasn't been straightforward until recently. In general, you shouldn't attempt to delete Kafka topics by deleting metadata in Zookeeper. You should always use the included command line utilities.
First you need to make sure that deleting topics is enabled in the server.properties file on all brokers, and do a rolling restart if needed:
delete.topic.enable=true
After you restart the brokers to enable topic deletion, you should issue the delete command using the command line utilities:
./kafka-topics.sh —zookeeper <zookeeper_host>:2181 —delete —topic <topic_name>
If at this point, it's still stuck, try to run these two commands from the zookeeper shell to make sure and remove all metadata for that particular topic:
rmr /brokers/topics/<topic_name>
rmr /admin/delete_topics/<topic_name>
A few more details here:
https://medium.com/#contactsunny/manually-delete-apache-kafka-topics-424c7e016ff3
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As far as I know version 1.0x and up, the config delete.topic.enable=true is the default configuration. Meaning, if I execute the delete command it should work as it expected.
However, I tried deleting the topic but it still there and was not deleted (when I describe the said topic in all brokers)
I read in some forums that I need to restart the broker servers and the zookeepers in order the deletion take effect.
Is there any other way to delete the topic without restarting the zookeeper and the brokers?
I'm trying to delete Kafka topic __Consumer_offset as it is causing a lot of confusion for my brokers.
When i do so, it says this topic can't be marked for deletion.
i'm using the zookeeper cli to delete it such as rmr /brokers/topic __consumer_offset, but it is not working!
__consumer_offsets is a kafka internal topic and it is not allowed to be deleted through delete topic command. It contains information about committed offsets for each topic:partition for each group of consumers (groupID). If you want to wipe it out entirely you have to delete the zookeeper dataDir location. That implies, you lose all the metadata.
Also if you just want to get rid of the existing consumer groups, you can as well reset the offsets or consider deleting them.
AFAIK you cannot delete that topic. It is a internal topic and should not be deleted manually.
If it is must, then you will have to manually clean/remove your data directory. When you deploy Kafka brokers and Zookeepers it creates data directory.
Note: By removing data directory you will loose all topics and related data. So this is not feasible option in Production.
I am using bin/kafka-topics.sh --zookeeper --delete --topic and i see in kafka logs of that indicate that the partitions for that topic are marked for deletion. However, I am still seeing the directories for those partitions present in the data dir.
Is this something expected and I am have manually delete them?
The topics haven't been removed from the zookeeper also. I still see the topics in zookeeper. Is this also expected?
Thanks!
There could be several reasons for topics not being deleted automatically.
In order to delete a topic delete.topic.enable should be set to true.
If it is set to true, it should ideally delete the directories from Zookeeper and kafka data.dir . But in case, if it doesn't, you should check the logs to make sure if there is any problem with kafka brokers or zookeeper due to some LEADER selection issue.
So in that case, you have to cleanup the dirs manually.
I'm trying to remove a Kafka topic with 8 partitions and 2 replications. First I delete that topic using kafka-topic.sh --delete command. Then I used zkCli.sh -server slave1.....slave3, and rmr /brokers/topics/MY_TOPIC.
However I still see that topic in /brokers/topics/. And I tried restart Kafka, everything still the same.
Btw, topic with 1 partition and 1 replica can be deleted successfully.
You can set server properties to enable delete of kafka topic
Add line mentioned below in service.properties
delete.topic.enable = true
If you removing manually using rmr /brokers/topics/MY_topic then you also need to remove topic related metadata from other nodes in zookeeper ex- consumer information about that topic. Also need to remove kafka topic director on kafka server.
It is cleaner to enable topic delete property and execute kafka-topics.sh --delete
I am using Kafka version 0.8.2. In the middle of development I thought I might need to delete a topic. So what I did is I put the following line in the server configuration files and started two kafka servers.
delete.topic.enable=true
When I needed to delete a topic and I ran following command,
bin/kafka-topics.sh --zookeeper localhost:2181 --delete --topic MyTopic
Right now its already 17 hours since when I ran delete topic command but Kafka is still showing me the topic is marked for deletion. Is it a bug of Kafka or I am doing something wrong here? Because it doesn't seem normal to me. Can someone clarify in this regard?
[N.B.: I have already read this thread. But couldn't find my answer there.]
AFAIK it is not possible to delete kafka topic if you previously had delete.topic.enable=false. You can change this value, but it does not affect currently available topics. So, you can try to delete it manually.
You can go to the log folder location and manually delete the files concerning the topic you want to delete.