viirya commented on issue #25856: [SPARK-29182][Core] Cache preferred locations 
of checkpointed RDD
URL: https://github.com/apache/spark/pull/25856#issuecomment-536069429
 
 
   > Is there any guess about how often the correct location would change? is 
it quite exceptional, or common?
   
   I do not have statistic number for this. The correct location changes when 
blocks on DFS are corrupted and DFS tries to create new replicas on new host. I 
guess it is not say quite exceptional, but it should not be frequently 
happened. This is just my guess, of course.
   
   

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