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https://issues.apache.org/jira/browse/LUCENE-3778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13222368#comment-13222368
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Martijn van Groningen commented on LUCENE-3778:
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{quote}
One can actually use GroupingSearch in a shard'd env, on each shard,
right? It's just that then you merge them like normal on the front
end (ie, TopGroups.merge). Is that the only reason for the "... in a
non distributed environment" javadoc warning?
{quote}
In a sharded env one needs to first execute all the first pass collector on all
shards, merge the returned search groups, execute the second pass search (with
the top N merged search groups as argument) on most of the shards and finally
merge the TopGroups from all shards into a topN TopGroups. Also grouping by
docblock and grouping features like allGroups and groupHead don't work in a
normal sharded environment (unless you partition the groups properly). The docs
caching also only makes sense when performing grouping on a local index. This
usage is very different then non distributed grouping, that is why I think it
is better to have a separate grouping convenience class for distributed
grouping (DistributedGroupSearch?).
bq. Maybe the ctor should take docValuesType / diskResidentValues
Makes sense!
bq. Maybe you should pass the groupSort, groupsOffset, groupsLimit to the
search method (instead of setters)?
Maybe we just should have defaults for these options? Sort.RELEVANCE, 0 and 10?
> Create a grouping convenience class
> -----------------------------------
>
> Key: LUCENE-3778
> URL: https://issues.apache.org/jira/browse/LUCENE-3778
> Project: Lucene - Java
> Issue Type: Improvement
> Components: modules/grouping
> Reporter: Martijn van Groningen
> Attachments: LUCENE-3778.patch
>
>
> Currently the grouping module has many collector classes with a lot of
> different options per class. I think it would be a good idea to have a
> GroupUtil (Or another name?) convenience class. I think this could be a
> builder, because of the many options
> (sort,sortWithinGroup,groupOffset,groupCount and more) and implementations
> (term/dv/function) grouping has.
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