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https://issues.apache.org/jira/browse/SOLR-236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12836919#action_12836919
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Peter Steevensz commented on SOLR-236:
--------------------------------------
I applied this patch to the nightlybuild of feb 22 and this compilers without
any problem.
I can start Solr and it runs fine. But when i add the Field Collapse in the
solrconfig.xml i cannot start Solr anymore.
After adding this line to my solrconfig.xml:
<searchComponent name="query"
class="org.apache.solr.handler.component.CollapseComponent" />
I get this error when i run Solr:
2010-02-22 22:24:30.722::WARN: Failed startup of context
org.mortbay.jetty.webapp.webappcont...@7f5580{/solr,jar:file:/opt/apache-solr-1.5-dev/example/webapps/solr.war!/}
java.lang.NullPointerException
at
org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:593)
at org.mortbay.jetty.servlet.Context.startContext(Context.java:139)
at
org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1218)
at
org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:500)
at
org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448)
at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40)
at
org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:147)
at
org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:161)
at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40)
at
org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:147)
at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40)
at
org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:117)
at org.mortbay.jetty.Server.doStart(Server.java:210)
at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40)
at org.mortbay.xml.XmlConfiguration.main(XmlConfiguration.java:929)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.mortbay.start.Main.invokeMain(Main.java:183)
at org.mortbay.start.Main.start(Main.java:497)
at org.mortbay.start.Main.main(Main.java:115)
(I am using Centos with Java 1.6 build 16)
Any help is greatly appreciated!!
> 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: 1.5
>
> 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, 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,
> quasidistributed.additional.patch, SOLR-236-FieldCollapsing.patch,
> SOLR-236-FieldCollapsing.patch, SOLR-236-FieldCollapsing.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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