mridulm commented on pull request #32790:
URL: https://github.com/apache/spark/pull/32790#issuecomment-856051950


   @attilapiros:
   
   > That one is also negative. It uses an externalShuffleServiceBlockStatus: 
Option[JHashMap[BlockId, BlockStatus]] where entries are removed by the key:
   
   I was referring to this, yes - essentially when all the block id's are 
removed - we end up with an entry in `blockManagerInfo` Map (which is referring 
to this hash map as the value) which does not have any entries (empty map).
   
   Essentially, this is similar as `removeRdd`.
   In `BlockManagerMasterEndpoint.updateBlockInfo`, after 
`blockManagerInfo(blockManagerId).updateBlockInfo` we can end up with an empty 
map as value.
   


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