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From "Martijn van Groningen (JIRA)" <>
Subject [jira] Commented: (SOLR-2205) Grouping performance improvements
Date Fri, 29 Oct 2010 16:27:20 GMT


Martijn van Groningen commented on SOLR-2205:

bq. Here's an additional patch that removes the second (redundant) comparison with the lowest
group (in addition to some other minor tweaks like removing the boolean).
Nice! Now it's even faster. Average search time is now 250 ms (measured on my test data set).

bq.  I also committed the addition of the ord methods to DocValues
Is see that the changes the DocValues impl in StrField class is not included. Is there a reason
for that?

Should I put the rest of my initial patch (changes to Phase2GroupCollector) to SOLR-2068?

> Grouping performance improvements
> ---------------------------------
>                 Key: SOLR-2205
>                 URL:
>             Project: Solr
>          Issue Type: Sub-task
>          Components: search
>    Affects Versions: 4.0
>            Reporter: Martijn van Groningen
>             Fix For: 4.0
>         Attachments: SOLR-2205.patch, SOLR-2205.patch
> This issue is dedicated to the performance of the grouping functionality.
> I've noticed that the code is not really performing on large indexes. Doing a search
(q=*:*) with grouping on an index from around 5M documents took around one second on my local
development machine. We had to support grouping on an index that holds around 50M documents
per machine, so we made some changes and were able to happily serve that amount of documents.
Patch will follow soon.

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