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https://issues.apache.org/jira/browse/SOLR-12852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16646915#comment-16646915
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Markus Jelsma commented on SOLR-12852:
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Hello David,
We have regular SolrCloud collections using various number of shards. I
wouldn't see how our collection's characteristics could mess up.
I know distributed search calls SearchComponent's process() multiple times per
request, at different phases, only at the final phase fields are available to
do highlighting or clustering on. So i think this component never had support
for distributed search in the first place. That doesn't explain
DistributedClusteringComponentTest passing though.
Testing for the correct phase, and perhaps even the null check might solve it.
Perhaps a committer having experience dealing with SearchComponent and
different distributed search phases could chime in on this?
Regards,
Markus
> NPE in ClusteringComponent
> --------------------------
>
> Key: SOLR-12852
> URL: https://issues.apache.org/jira/browse/SOLR-12852
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: contrib - Clustering
> Affects Versions: 7.5
> Reporter: Markus Jelsma
> Assignee: Dawid Weiss
> Priority: Major
> Fix For: master (8.0)
>
>
> Got this exception:
> {code}
> o.a.s.s.HttpSolrCall null:java.lang.NullPointerException
> at
> org.apache.solr.handler.clustering.ClusteringComponent.process(ClusteringComponent.java:234)
> at
> org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:298)
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:199)
> at org.apache.solr.core.SolrCore.execute(SolrCore.java:2541)
> at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:709)
> at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:515)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:377)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:323)
> {code}
> with this config (copied from reference guide, changed title and snippet
> parameters)
> {code}
> <searchComponent name="clustering"
> class="solr.clustering.ClusteringComponent">
> <!-- Lingo clustering algorithm -->
> <lst name="engine">
> <str name="name">lingo</str>
> <str
> name="carrot.algorithm">org.carrot2.clustering.lingo.LingoClusteringAlgorithm</str>
> </lst>
> <!-- An example definition for the STC clustering algorithm. -->
> <lst name="engine">
> <str name="name">stc</str>
> <str
> name="carrot.algorithm">org.carrot2.clustering.stc.STCClusteringAlgorithm</str>
> </lst>
> </searchComponent>
>
> <requestHandler name="/clustering"
> class="solr.SearchHandler">
> <lst name="defaults">
> <bool name="clustering">true</bool>
> <bool name="clustering.results">true</bool>
> <!-- Logical field to physical field mapping. -->
> <str name="carrot.url">id</str>
> <str name="carrot.title">title_nl</str>
> <str name="carrot.snippet">content_nl</str>
> <!-- Configure any other request handler parameters. We will cluster the
> top 100 search results so bump up the 'rows' parameter. -->
> <str name="rows">100</str>
> <str name="fl">*,score</str>
> </lst>
> <!-- Append clustering at the end of the list of search components. -->
> <arr name="last-components">
> <str>clustering</str>
> </arr>
> </requestHandler>
> {code}
> using this query:
> http://localhost:8983/solr/collection/clustering?q=*:*
> All libraries are present, Solr no longer complains about missing classes,
> instead i got this.
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