dongjoon-hyun edited a comment on pull request #32604:
URL: https://github.com/apache/spark/pull/32604#issuecomment-845484121


   @Yikun and @srowen . We cannot enforce to install `shasum` additionally. 
That's another requirement.
   > If it's not found, the build mvn would be breaked with exit 2. Then, the 
developer can install the shasum mannually.
   
   If we can ask the users to install additionally, why do we need to download 
`Maven` via wrapper on-demand by wasting lots of resources. We can just fail at 
Maven-enforcer plugin and add documents. It's not that easy to add another 
requirements.


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