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Posted to reviews@spark.apache.org by "wangyum (via GitHub)" <gi...@apache.org> on 2023/11/17 02:42:55 UTC

Re: [PR] [SPARK-44021][SQL] Add spark.sql.files.maxPartitionNum [spark]

wangyum commented on PR #41545:
URL: https://github.com/apache/spark/pull/41545#issuecomment-1815662327

   Limiting the number of mappers can also reduce RPC calls to improve NameNode performance.
   
   Mapper tasks | 31920 | 15960 | 7980 | 3990 | 3648
   -- | -- | -- | -- | -- | --
   RPC calls | 127671 | 64684 | 31919 | 15953 | 15953
   
   


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