Gatsby-Lee commented on issue #3975:
URL: https://github.com/apache/hudi/issues/3975#issuecomment-972113121


   > Hi @xushiyan, MOR is not possible because it is not supported by AWS tools 
like Athena and this particular dataset has no filed guaranteed to be 100% 
immutable, and fields "near-immutable" would go trough the same problem. If 
fact the date could be considered near-immutable as on each load, I am 
upsetting over 100k rows and deleting only a few hundreds.
   > 
   > Ay other ideas on how to make the "getting small files from partitions" 
jobs run faster? And why are there 3 of such jobs running sequentially with 
different number of stages and tasks?
   > 
   > Thanks
   
   Hi, I happened to see your issue.
   I am also using Apache Hudi in AWS Glue.
   
   I am using MoR and I can query data through Amazon Athena.
   
   I picked MoR over CoW since I want to prevent "hudi writing"  spending time 
on rewriting Parquet.
   Do you have any reason to pick CoW over MoW?
   
   Thank you
   Gatsby


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