zzzzming95 commented on PR #37263:
URL: https://github.com/apache/spark/pull/37263#issuecomment-1193308223

   @c21  Thanks Reply~
   
   The default values of `spark.sql.parquet.zstd.level` and 
`spark.sql.parquet.zstd.worker` are set to 3 and 0 respectively, because this 
is the default parameter of `parquet-mr`.
   
   detail in `parquet-mr` : 
https://github.com/apache/parquet-mr/blob/master/parquet-hadoop/README.md
   
   In `parquet-mr`, zstd level and zstd workers correspond to parameters 
`parquet.compression.codec.zstd.level` and 
`parquet.compression.codec.zstd.workers` respectively. 
   
   When no parameters were specified before, the default parameters for zstd 
level and zstd workers are 3 and 0.
   
   
   
   


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