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https://issues.apache.org/jira/browse/SOLR-2564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13046150#comment-13046150
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Michael McCandless commented on SOLR-2564:
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bq. Actually, the worst case is twice as slow due to unneeded caching of a
simple query.
Sorry, what do you mean here?
bq. but I still question the default, which can lead to surprisingly huge
memory use (think up to a field cache entry or more allocated per-request).
I agree; -1 is a dangerous default.
But I think caching should still default to on, just limited as a pctg
of the number of docs in the index. Ie, by default we will cache the
result set if it's less than 20% (say) of total docs in your index.
Else we fallback to 2-pass.
I think this matches how Solr handles caching filters now? Ie, filter
cache evicts by total filter count and not net MB right, I think? So
that if you have more docs in your index you'll spending more RAM on
the caching...
Costly queries that return a smallish result set can see big gains
from the caching.
> Integrating grouping module into Solr 4.0
> -----------------------------------------
>
> Key: SOLR-2564
> URL: https://issues.apache.org/jira/browse/SOLR-2564
> Project: Solr
> Issue Type: Improvement
> Reporter: Martijn van Groningen
> Assignee: Martijn van Groningen
> Fix For: 4.0
>
> Attachments: LUCENE-2564.patch, SOLR-2564.patch, SOLR-2564.patch,
> SOLR-2564.patch, SOLR-2564.patch, SOLR-2564.patch
>
>
> Since work on grouping module is going well. I think it is time to wire this
> up in Solr.
> Besides the current grouping features Solr provides, Solr will then also
> support second pass caching and total count based on groups.
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