ahanikel opened a new pull request, #1427:
URL: https://github.com/apache/jackrabbit-oak/pull/1427

   The persistent disk cache computes its size internally by adding/subtracting 
the size of added/purged segments. We would like to be able to see if that 
computation is correct, by having both the computed size and the effective size 
on disk in the metrics.
   
   The background for this is that in a few rare instances, the disk cache 
evicted too many items (down to almost zero) instead of the expected 65% of its 
max size.
   
   Also we want to make sure that no evictions happen on items that have a 
length of zero. We're not sure if that happens or not, so the change is to 
refuse eviction in that case and log a warning instead.
   


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