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From "Shawn Heisey (Commented) (JIRA)" <>
Subject [jira] [Commented] (SOLR-2889) Implement Adaptive Replacement Cache
Date Mon, 16 Apr 2012 13:14:19 GMT


Shawn Heisey commented on SOLR-2889:

After thinking about what ended up being the final code for SOLR-2906, I know that I won't
be able to tackle this, but I am wondering whether this is really necessary any more.  The
timeDecay option on the LFU cache implementation could be viewed as an LRU tweak to the LFU
cache, which I think fulfills my original goals even if it's not a true ARC cache.  Does that
mean this issue should be closed?  I can't say.

I hope someone really smart is able to provide some serious speed optimization for the new
LFU cache.
> Implement Adaptive Replacement Cache
> ------------------------------------
>                 Key: SOLR-2889
>                 URL:
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>    Affects Versions: 3.4
>            Reporter: Shawn Heisey
>            Priority: Minor
> Currently Solr's caches are LRU, which doesn't look at hitcount to decide which entries
are most important.  There is a method that takes both frequency and time of cache hits into
> If it's feasible, this could be a good addition to Solr/Lucene.

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