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From "Stephen Weiss (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-236) Field collapsing
Date Tue, 14 Sep 2010 05:20:31 GMT

    [ https://issues.apache.org/jira/browse/SOLR-236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12909116#action_12909116
] 

Stephen Weiss commented on SOLR-236:
------------------------------------

FWIW, I fixed my earlier OOM issues with some garbage collection tuning.

Now I'm noticing NPEs very similar to those people were reporting back before the patch from
Jun 28th:

SEVERE: java.lang.NullPointerException
	at org.apache.solr.search.fieldcollapse.NonAdjacentDocumentCollapser$FloatValueFieldComparator.compare(NonAdjacentDocumentCollapser.java:450)
	at org.apache.solr.search.fieldcollapse.NonAdjacentDocumentCollapser$DocumentComparator.compare(NonAdjacentDocumentCollapser.java:262)
... it's the same backtrace ...

I'm guessing it's because I added those 5 lines back into the patch to get the paging working
again.

It's rather infrequent, it's probably something I can deal with until the new patch is complete.
 It doesn't happen every time at all like it seemed to happen to many people - just once in
a while, and on queries that honestly run all the time, so it seems random and not related
to a particular query (except perhaps in the size of the filter queries - these fqs relatively
large #'s of documents).  But if any of this code makes it to the new patch I thought it would
be worth mentioning.

> Field collapsing
> ----------------
>
>                 Key: SOLR-236
>                 URL: https://issues.apache.org/jira/browse/SOLR-236
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>    Affects Versions: 1.3
>            Reporter: Emmanuel Keller
>            Assignee: Shalin Shekhar Mangar
>             Fix For: Next
>
>         Attachments: collapsing-patch-to-1.3.0-dieter.patch, collapsing-patch-to-1.3.0-ivan.patch,
collapsing-patch-to-1.3.0-ivan_2.patch, collapsing-patch-to-1.3.0-ivan_3.patch, DocSetScoreCollector.java,
field-collapse-3.patch, field-collapse-4-with-solrj.patch, field-collapse-5.patch, field-collapse-5.patch,
field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch,
field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch,
field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch,
field-collapse-5.patch, field-collapse-solr-236-2.patch, field-collapse-solr-236.patch, field-collapsing-extended-592129.patch,
field_collapsing_1.1.0.patch, field_collapsing_1.3.patch, field_collapsing_dsteigerwald.diff,
field_collapsing_dsteigerwald.diff, field_collapsing_dsteigerwald.diff, NonAdjacentDocumentCollapser.java,
NonAdjacentDocumentCollapserTest.java, quasidistributed.additional.patch, SOLR-236-1_4_1.patch,
SOLR-236-FieldCollapsing.patch, SOLR-236-FieldCollapsing.patch, SOLR-236-FieldCollapsing.patch,
SOLR-236-trunk.patch, SOLR-236-trunk.patch, SOLR-236-trunk.patch, SOLR-236-trunk.patch, SOLR-236-trunk.patch,
SOLR-236.patch, SOLR-236.patch, SOLR-236.patch, SOLR-236.patch, SOLR-236.patch, SOLR-236.patch,
SOLR-236.patch, solr-236.patch, SOLR-236_collapsing.patch, SOLR-236_collapsing.patch
>
>
> This patch include a new feature called "Field collapsing".
> "Used in order to collapse a group of results with similar value for a given field to
a single entry in the result set. Site collapsing is a special case of this, where all results
for a given web site is collapsed into one or two entries in the result set, typically with
an associated "more documents from this site" link. See also Duplicate detection."
> http://www.fastsearch.com/glossary.aspx?m=48&amid=299
> The implementation add 3 new query parameters (SolrParams):
> "collapse.field" to choose the field used to group results
> "collapse.type" normal (default value) or adjacent
> "collapse.max" to select how many continuous results are allowed before collapsing
> TODO (in progress):
> - More documentation (on source code)
> - Test cases
> Two patches:
> - "field_collapsing.patch" for current development version
> - "field_collapsing_1.1.0.patch" for Solr-1.1.0
> P.S.: Feedback and misspelling correction are welcome ;-)

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