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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-2564) Integrating grouping module into Solr 4.0
Date Wed, 08 Jun 2011 18:34:58 GMT

    [ https://issues.apache.org/jira/browse/SOLR-2564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13046125#comment-13046125
] 

Yonik Seeley commented on SOLR-2564:
------------------------------------

bq. If the 16% slowdown is worst case

Actually, the worst case is twice as slow due to unneeded caching of a simple query.  Luckily
this can be configured... 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).  One advantage
to the dual-pass approach by default in the first place was avoiding surprisingly large memory
usage by default (which can degrade less gracefully by causing OOM exceptions as people try
to crank up the number of request threads).


> 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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