Tanya-W commented on issue #18047:
URL: https://github.com/apache/doris/issues/18047#issuecomment-1485045282

   The release logic here is reasonable, as release is usually called in 
conjunction with insert or lookup:
   1. `lookup + release` will not increase the cache usage.
   
   2. ` insert + release`, if `_usage + current_item_total_size > _capacity` 
during the insert, there will trigger the eviction of infrequently used items. 
If no existing items are evicted during the insert, it means that all items in 
the current cache are hot. In this case, it is reasonable to throw away the 
item to be inserted during release, to prevent the cache usage from increasing 
infinitely in the case of all hot data.


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