GitHub user tianliuliu edited a comment on the discussion: 【LMQ】Does LMQ have a 
quantity limit?

> @tianliuliu I'm looking forward to your reply
@humkum 
1. The early design did set a limit on the number of LMQs to 20,000. As for the 
subsequent deletion of the limit, I am not sure. This can be traced to the code 
git push record and asked about the reason for the deletion of the limit.
2. The introduction of LMQ will lead to the introduction of a large number of 
small index files into the RocketMQ system. Considering the limitation of the 
operating system file system inode, and the maintenance and dataStore of 
metadata is a very big challenge, so this limitation is added.
3. In the usage scenario, it is not recommended to open too many LMQs. You can 
adjust the grayscale step by step, and check the system load to finally 
determine the number to use. The current 20,000 is just an experience value.

GitHub link: 
https://github.com/apache/rocketmq/discussions/6899#discussioncomment-6169619

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