lfxy opened a new pull request, #8064:
URL: https://github.com/apache/hadoop/pull/8064

   Sometimes, certain directories—such as temporary library directories—contain 
too many subdirectories and files, exceeding the limit defined by the 
dfs.namenode.fs-limits.max-directory-items configuration. This causes many jobs 
to fail.
   
   To quickly restore job execution, we need to temporarily adjust this 
configuration. However, since it currently requires to restart NameNode to take 
effect, we need to make it dynamically reconfigurable without restarting the 
NameNode.


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