Question about solr caches and warming

[Shawn Heisey]

Do Solr's LRU caches pay attention to hitcount when deciding which 
entries to age out and use for autowarming, or is it purely based on the 
last time that entry was touched?  Is it a reasonable idea to come up 
with an algorithm that uses hitcount along with entry age, ideally with 
a configurable weight value?

I'm asking because I have really nasty filter queries that make for very 
slow autowarming of the filterCache.  I've had to drop my autowarmCount 
on the filterCache to 4, and warming that cache can still take 30-60 
seconds.  Sometimes it's very fast, as low as 3 seconds.

Although I don't have statistics to back my claim, I suspect that the 
really nasty filters don't have as high a hitcount as the ones that are 
more simple.  Typically the really nasty filters are used when an 
employee logs into the site.  Employees have access to a lot more than 
customers do, but the search still needs to be filtered to be 
appropriate for whatever search options are active.

If hitcount could be examined as well as entry age, I think that it 
could do a better job of selecting entries for warming, and I could use 
more than 4.

Thanks,
Shawn