How to manually delete all files under a topic's partitioins

[le....@qtparking.com]

  Good afternoon Apache Kafka users group。 
  Excuse me, how to manually delete all partitions a topic message under the 
file, I know that the first step must be to stop the Kafka service but 
zookeeper service, there is no need to stop, then the second step is to 
directly execute the rm command to delete the partitions files, it is? 

    Thank you!