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From Chris Hostetter <>
Subject Re: Solr hangs / LRU operations are heavy on cpu
Date Fri, 20 Mar 2015 18:02:34 GMT
: we have quite a problem with Solr. We are running it in a config 6x3, and
: suddenly solr started to hang, taking all the available cpu on the nodes.
: In the threads dump noticed things like this can eat lot of CPU time
:    -​(
:    -

That specific code path pertains to the documentCache - this 
particular thread appears to be blocked on inserting docs into that 
(synchronized) map because of some other thread already doing an insert.

depending on your usage patterns, you may find it better to just disable 
the documentCache completley -- it's primarily useful when you have lots 
of stored fields in your docs, and a lot of "hot" documents that are 
frequently returned by a lot of different searches (ie: because you always 
sort on the same sets of fields) ... but if you aren't seeing any hits on 
your documentCache, just get rid of it.

the choice of having a documentCache and what type of cacheImpl to use for 
the doc cache can be completley independent of what impl you use ofr oher 
caches (maybe you disable the doc cache, use LRU for the filterCache, and 
LFU for the queryResultCache -- they are all independently configurable, 
one size doesn't neccessarily fit all)

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