q2w commented on pull request #32677:
URL: https://github.com/apache/spark/pull/32677#issuecomment-860602779


   > This looks like a good direction to go. But given the decommission is only 
a best effort, I don't think it worth such complexity.
   > 
   > Maybe, making the StorageLevel as DISK_ONLY (with a conf option) for the 
migration blocks should be enough?
   
   @Ngone51 Thanks for taking a look. I have opened a separate PR for making 
StorageLevel to DISK_ONLY with a conf. 
https://github.com/apache/spark/pull/32902. Please have a look.
   
   On the current PR, a part of the PR is just focusing on transferring a flag 
to peer block managers to distinguish request for genuine replication and block 
migration. Should we continue with this in part? This will enable us to put 
more checks on peer block managers to restrict block migration(like putting 
limit on disk used for migrating block etc.). Would this be useful?


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