Question:

Why constant updates slow down SOLR performance even if I am not executing
Commit? I just noticed this... Thead dump shows something "Lucene ...
Clone()", and significant CPU usage. I did about 5 mlns updates via HTTP
XML, single document at a time, without commit, and performance went down,
100% CPU...

After Commit/Optimize it is stabilized, 0.5 - 2 seconds per page generation
(100 facets + 100 products), 15%-25% CPU:

filterCache   
class:  org.apache.solr.search.LRUCache   
version:  1.0   
description:  LRU Cache(maxSize=2000000, initialSize=1000000)   
stats:  lookups : 109294990 
hits : 107637040 
hitratio : 0.98 
inserts : 1658092 
evictions : 0 
size : 879637 
cumulative_lookups : 341225983 
cumulative_hits : 337721881 
cumulative_hitratio : 0.98 
cumulative_inserts : 3504573 
cumulative_evictions : 0 
 

Performance of SOLR itself is good/acceptable (even with huge facet
distribution), but it goes down when I do a lot of updates (without
commit/autocommit)

Thanks,
Fuad
http://www.tokenizer.org
 

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