[SOLR-4150] NPE in distributed result grouping if group.query has no results

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.0
• Fix Version/s: 4.1
• Component/s: SolrCloud
• Assignee: Tommaso Teofili
• Reporter: Lance Norskog
• Created: 06/Dec/12 04:00
• Updated: 24/Jan/13 06:33
• Resolved: 13/Dec/12 09:30

Description

If group.query has no results in a distributed search, there is an NPE in the front-end:

Dec 5, 2012 10:40:31 PM org.apache.solr.core.SolrCore execute
INFO: [collection1] webapp=/solr path=/select params={debugQuery=true&group.ngroups=true&fl=thing,eventid&indent=true&q=thing:("CODE:20517")&group.field=eventid&group.query=thing:CODE*&group=true&wt=json&fq=source:somewhere} status=500 QTime=745 
Dec 5, 2012 10:40:31 PM org.apache.solr.common.SolrException log
SEVERE: null:java.lang.NullPointerException
	at org.apache.solr.search.grouping.distributed.shardresultserializer.TopGroupsResultTransformer.transformToNative(TopGroupsResultTransformer.java:110)
	at org.apache.solr.search.grouping.distributed.responseprocessor.TopGroupsShardResponseProcessor.process(TopGroupsShardResponseProcessor.java:80)
	at org.apache.solr.handler.component.QueryComponent.handleGroupedResponses(QueryComponent.java:620)
	at org.apache.solr.handler.component.QueryComponent.handleResponses(QueryComponent.java:603)
	at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:309)
	at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:129)
	at org.apache.solr.core.SolrCore.execute(SolrCore.java:1699)
	at org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:455)
	at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:276)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1337)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:484)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:233)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1065)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:413)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:192)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:999)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:250)
	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:149)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:111)
	at org.eclipse.jetty.server.Server.handle(Server.java:351)
	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:454)
	at org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:47)
	at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:890)
	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:944)
	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:634)
	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:230)
	at org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:66)
	at org.eclipse.jetty.server.bio.SocketConnector$ConnectorEndPoint.run(SocketConnector.java:254)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:599)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:534)
	at java.lang.Thread.run(Thread.java:662)

(This is in sharding, maybe not a SolrCloud problem.)

Issue Links

• is related to: SOLR-4181 grouping response format inconsistent in distributed search when no docs match group.query