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https://issues.apache.org/jira/browse/SOLR-303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12607106#action_12607106
 ] 

Brian Whitman commented on SOLR-303:
------------------------------------

Putting &debugQuery on a query with shards that returns 0 results will NPE:

{code}
INFO: webapp=/solr path=/select 
params={shards=localhost:8983/solr,localhost:8984/solr,localhost:8985/solr,localhost:8986/solr&debugQuery=true&q=i_tag:894&rows=100}
 status=500 QTime=8 
Jun 22, 2008 12:45:38 PM org.apache.solr.common.SolrException log
SEVERE: java.lang.NullPointerException
        at 
org.apache.solr.handler.component.DebugComponent.finishStage(DebugComponent.java:133)
        at 
org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:257)
        at 
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:125)
        at org.apache.solr.core.SolrCore.execute(SolrCore.java:965)
        at 
org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:338)
        at 
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:272)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1089)
        at 
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:365)
        at 
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
        at 
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
        at 
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
        at 
org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:211)
        at 
org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
        at 
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
        at org.mortbay.jetty.Server.handle(Server.java:285)
        at 
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:502)
        at 
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:821)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:513)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:208)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:378)
        at 
org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:226)
        at 
org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:442)

{code}

> Distributed Search over HTTP
> ----------------------------
>
>                 Key: SOLR-303
>                 URL: https://issues.apache.org/jira/browse/SOLR-303
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>            Reporter: Sharad Agarwal
>            Assignee: Yonik Seeley
>             Fix For: 1.3
>
>         Attachments: distributed.patch, distributed.patch, distributed.patch, 
> distributed.patch, distributed.patch, distributed.patch, distributed.patch, 
> distributed.patch, distributed.patch, distributed.patch, distributed.patch, 
> distributed.patch, distributed_add_tests_for_intended_behavior.patch, 
> distributed_facet_count_bugfix.patch, distributed_pjaol.patch, 
> fedsearch.patch, fedsearch.patch, fedsearch.patch, fedsearch.patch, 
> fedsearch.patch, fedsearch.patch, fedsearch.patch, fedsearch.stu.patch, 
> fedsearch.stu.patch, shards_qt.patch, solr-dist-faceting-non-ascii-all.patch
>
>
> Searching over multiple shards and aggregating results.
> Motivated by http://wiki.apache.org/solr/DistributedSearch

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