mridulm edited a comment on pull request #32790:
URL: https://github.com/apache/spark/pull/32790#issuecomment-865364961


   (Ignoring ephemenral nodes, dockerized deployments, etc - and using more 
real world scenarios)
   
   For a 5k cluster, the map can have upto 5k entries - with the values maps 
going of reasonable size (even if empty).
   For example, assuming 1k blocks per node on average - we end up with the map 
using approximately: ~ 5000 * 2048 * (~8 bytes) == ~80MB : this is the driver 
cost with zero blocks being used.
   
   


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