xkrogen commented on pull request #33446:
URL: https://github.com/apache/spark/pull/33446#issuecomment-885736213


   > And I think a more straightforward way to do this probably would be to log 
slow fetches which are slower than most fetches. For example, we could log the 
5%th percentile slow fetches among all fetches. The downside is that we have to 
store more intermediate states.
   
   This is a great idea actually. We can use [Dropwizard's Histogram with a 
uniform 
reservoir](https://metrics.dropwizard.io/4.1.2/manual/core.html#histograms) to 
keep histogram information with constant storage space.


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