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https://issues.apache.org/jira/browse/SOLR-2893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13149341#comment-13149341
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Martijn van Groningen commented on SOLR-2893:
---------------------------------------------
Does the error only occurs when wt=json in distributed mode? So when xml is
used as wt param value the error doesn't occur?
Do all your documents have a value for the group.field (id field)?
How often do you commit?
> NPE in JSONWriter during Distributed Search w/Grouping
> ------------------------------------------------------
>
> Key: SOLR-2893
> URL: https://issues.apache.org/jira/browse/SOLR-2893
> Project: Solr
> Issue Type: Bug
> Components: search
> Affects Versions: 4.0
> Environment: java version "1.6.0_18"
> OpenJDK Runtime Environment (IcedTea6 1.8) (fedora-41.b18.fc13-x86_64)
> OpenJDK 64-Bit Server VM (build 14.0-b16, mixed mode)
> Reporter: Michael Garski
>
> I am doing some testing with a nightly build from 11/4/2011 and I regularly
> encounter an NPE in the JSONWriter when performing a distributed search with
> grouping on a single numeric field. The same searches non-distributed do not
> encounter this issue.
> Here is the query being used:
> facet=off&shards=searcher1-vip:8983/solr/core_0,searcher2-vip:8983/solr/core_1,localhost:8983/solr/core_2&start=0&shards.qt=/item/search&q=nova+y+jory&wt=json&fq=country:ww+OR+country:us&fq=stream:1&rows=4
> Here is the handler configuration:
> <requestHandler name="/item/search" class="solr.SearchHandler">
> <lst name="invariants">
> <str name="echoParams">explicit</str>
> <str name="json.nl">map</str>
> <!-- Query settings -->
> <str name="defType">dismax</str>
> <str name="qf">title name^2.0</str>
> <str name="pf2">title name^2.0</str>
> <int name="ps2">2</int>
> <str
> name="bf">product(apply_bf,product(sum(premium,1),sum(ln(max(plays,1)),ln(max(sum(count,trend),1)))))^25</str>
> <!-- Faceting defaults -->
> <str name="facet.field">genre</str>
> <int name="f.genre.facet.mincount">1</int>
> <str name="f.genre.facet.method">enum</str>
> <!-- grouping -->
> <str name="group.field">id</str>
> <str name="group.ngroups">true</str>
> <int name="group.cache.percent">25</int>
> </lst>
> <lst name="defaults">
> <str name="wt">json</str>
> <str name="rows">10</str>
> <str name="facet">off</str>
> <str name="group">true</str>
> <str name="fl">contributor_id,album_id,song_id</str>
> <str
> name="bf">product(apply_bf,sum(ln(max(plays,1)),ln(max(sum(count,trend),1))))^25</str>
> </lst>
> <lst name="appends">
> <!-- query filter for rights date -->
> <str name="fq">start:[* TO NOW/DAY+1DAY] AND end:[NOW/DAY TO *]</str>
> </lst>
> </requestHandler>
> None of the individual shards log any sort of error, however the server that
> is distributing the search logs the following stack trace fairly regular and
> returns a 500 error:
> Nov 11, 2011 12:30:01 PM org.apache.solr.common.SolrException log
> SEVERE: java.lang.NullPointerException
> at
> org.apache.solr.response.JSONWriter.writeSolrDocument(JSONResponseWriter.java:320)
> at
> org.apache.solr.response.TextResponseWriter.writeSolrDocumentList(TextResponseWriter.java:201)
> at
> org.apache.solr.response.TextResponseWriter.writeVal(TextResponseWriter.java:169)
> at
> org.apache.solr.response.JSONWriter.writeNamedListAsMapWithDups(JSONResponseWriter.java:174)
> at
> org.apache.solr.response.JSONWriter.writeNamedList(JSONResponseWriter.java:290)
> at
> org.apache.solr.response.TextResponseWriter.writeVal(TextResponseWriter.java:173)
> at
> org.apache.solr.response.JSONWriter.writeArray(JSONResponseWriter.java:522)
> at
> org.apache.solr.response.TextResponseWriter.writeVal(TextResponseWriter.java:175)
> at
> org.apache.solr.response.JSONWriter.writeNamedListAsMapWithDups(JSONResponseWriter.java:174)
> at
> org.apache.solr.response.JSONWriter.writeNamedList(JSONResponseWriter.java:290)
> at
> org.apache.solr.response.TextResponseWriter.writeVal(TextResponseWriter.java:173)
> at
> org.apache.solr.response.JSONWriter.writeNamedListAsMapWithDups(JSONResponseWriter.java:174)
> at
> org.apache.solr.response.JSONWriter.writeNamedList(JSONResponseWriter.java:294)
> at
> org.apache.solr.response.TextResponseWriter.writeVal(TextResponseWriter.java:173)
> at
> org.apache.solr.response.JSONWriter.writeNamedListAsMapWithDups(JSONResponseWriter.java:174)
> at
> org.apache.solr.response.JSONWriter.writeNamedList(JSONResponseWriter.java:290)
> at
> org.apache.solr.response.JSONWriter.writeResponse(JSONResponseWriter.java:87)
> at
> org.apache.solr.response.JSONResponseWriter.write(JSONResponseWriter.java:51)
> at
> org.apache.solr.servlet.SolrDispatchFilter.writeResponse(SolrDispatchFilter.java:340)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:261)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
> at
> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)
> at
> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
> at
> org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
> at
> org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
> at
> org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)
> at
> org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
> at
> org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
> at
> org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
> at org.mortbay.jetty.Server.handle(Server.java:326)
> at
> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
> at
> org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:945)
> at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)
> at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
> at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
> at
> org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)
> at
> org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
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