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From Tomás Fernández Löbbe (JIRA) <>
Subject [jira] Commented: (SOLR-571) LRUCache autowarmCount should support percentages
Date Tue, 20 Apr 2010 20:26:49 GMT


Tomás Fernández Löbbe commented on SOLR-571:

I don't understand why it could take longer to commit than when using an absolute value instead
of a percentage.
The number of items sent from the old cache to the new cache will depend on the size of the
old cache and on the configured percentage. If someone uses a big percentage (like 75% or
100%) on a big cache, it might take long, but it will be pretty much the same of using a very
big number on autowarmCount attribute on the same cache.
Am I missing something? I can't see a problem here.

> LRUCache autowarmCount should support percentages
> -------------------------------------------------
>                 Key: SOLR-571
>                 URL:
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Hoss Man
> a recent thread reminded me of an old idea that never got implemented...
> the autowarmCount for LRUCaches should support "percentages" which get evaluated relative
the current size of the cache when warming happens.  
> in this way, a Solr instance might be configured with autowarmCount="50%" to autowarm
the top half of the queries ... a master machine might be configured this way to give some
autowarming if it is inadvertently being queried, but things won't be maintained in the caches
in perpetuity ... each subsequent cache instance would have fewer and fewer of the "old" queries
warmed automatically.

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