[ 
https://issues.apache.org/jira/browse/SOLR-5019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13702259#comment-13702259
 ] 

Aditya commented on SOLR-5019:
------------------------------

Some Additional Stack from logs. This exception is also observed around the 
error.

2013-06-25 10:52:52,471 WARNING [org.apache.solr.spelling.SpellCheckCollator] 
(ajp-0.0.0.0-8009-50) Exception trying to re-query to check if a spell check 
possibility would return any hits.
java.util.ConcurrentModificationException
        at 
java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
        at java.util.AbstractList$Itr.next(AbstractList.java:343)
        at java.util.AbstractList.equals(AbstractList.java:506)
        at org.apache.solr.search.QueryResultKey.isEqual(QueryResultKey.java:96)
        at org.apache.solr.search.QueryResultKey.equals(QueryResultKey.java:81)
        at java.util.HashMap.put(HashMap.java:376)
        at org.apache.solr.search.LRUCache.put(LRUCache.java:123)
        at 
org.apache.solr.search.SolrIndexSearcher.getDocListC(SolrIndexSearcher.java:1377)
        at 
org.apache.solr.search.SolrIndexSearcher.search(SolrIndexSearcher.java:457)
        at 
org.apache.solr.handler.component.QueryComponent.process(QueryComponent.java:410)
        at 
org.apache.solr.spelling.SpellCheckCollator.collate(SpellCheckCollator.java:112)
        at 
org.apache.solr.handler.component.SpellCheckComponent.addCollationsToResponse(SpellCheckComponent.java:203)
        at 
org.apache.solr.handler.component.SpellCheckComponent.process(SpellCheckComponent.java:180)
        at 
org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:208)
        at 
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:135)
        at org.apache.solr.core.SolrCore.execute(SolrCore.java:1817)
        at 
org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:639)
        at 
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:345)
        at 
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:141)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at 
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at 
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
        at 
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
        at 
org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
        at 
org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at 
org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
        at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:436)
        at 
org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:384)
        at 
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
        at java.lang.Thread.run(Thread.java:662)

                
> spurious ConcurrentModificationException with spell check component
> -------------------------------------------------------------------
>
>                 Key: SOLR-5019
>                 URL: https://issues.apache.org/jira/browse/SOLR-5019
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Yonik Seeley
>            Assignee: Yonik Seeley
>            Priority: Minor
>             Fix For: 5.0, 4.4
>
>
> ConcurrentModificationException with spell check component
> http://markmail.org/message/bynajxhgzi2wyhx5

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