How to delete the setting of retention.ms from topic

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1

by default all topics in our kafka cluster are with retention hours=24 , ( as defined in kafka server.properties )

we decided to decrease the retention hours only on topic test to 64000 ms

so we set the following retention hours - 64000 on topic test

kafka-configs.sh --zookeeper zoo_server:2181 --entity-type topics --alter --entity-name test -add-config retention.ms=64000

now we want to return the default retention hours on topic test ( to 24 hours ) ,as was before

we don’t sure if the following kafka cli , really return the retention hours to 24 on topic test

kafka-configs.sh --zookeeper zoo_server:2181 --alter --entity-type topics --entity-name test --delete-config retention.ms

as I know the above delete the configuration of the retention in ms but I not sure if this is really what above command is doing

please advice if I am wrong?

NOTE: in order to get all data about retention for particular topic in kafka , we can do

kafka-topics.sh --zookeeper zoo_server:2181 --describe --topics-with-overrides

reference- How to see the retention for a particular topic in kafka - Stack Overflow

reference - apache kafka - Delete topic level config - Stack Overflow

additionally:

I can suggest other approach as:

kafka-configs.sh --zookeeper zoo_server:2181 --entity-type topics --alter --entity-name test -add-config retention.ms=86400000

its configure the 24 hours for test topic , but this is workaround
but I preferred is to delete the configuration of retention in ms instead of set the retention in ms to 86400000

2

Hello! First off, welcome to the Forum and congrats on your first post. :slight_smile:

You are entirely correct. As per the documentation, you can rest assured that

> bin/kafka-configs.sh --bootstrap-server localhost:9092  --entity-type topics --entity-name my-topic
  --alter --delete-config retention.ms

is, in fact, removing the override that you had set and returning that config to cluster defaults. Hope that gives you peace of mind!

2 Likes
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thank you so much
you answered on my Question

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I guess , after we returned the default config , then no need to restart the Kafka broker
am I right?

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No, I don’t believe so! I don’t recall ever having to do that for a topic config change.

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