Hi all,
I am using Solr 3.6.1 version. I am giving a set of requests to solr
simultaneously. When I check the log file, I noticed the below exception
stack trace
SEVERE: java.util.ConcurrentModificationException
at
java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:761)
at java.util.LinkedList$ListItr.next(LinkedList.java:696)
at
org.apache.solr.highlight.SolrHighlighter.getHighlightFields(SolrHighlighter.java:106)
at
org.apache.solr.highlight.DefaultSolrHighlighter.doHighlighting(DefaultSolrHighlighter.java:369)
at
org.apache.solr.handler.component.HighlightComponent.process(HighlightComponent.java:131)
at
org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:186)
at
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:129)
at org.apache.solr.core.SolrCore.execute(SolrCore.java:1376)
at
org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:365)
at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:260)
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:218)
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)
When I searched through the solr issues, I got the following two url's,
https://issues.apache.org/jira/browse/SOLR-2684
https://issues.apache.org/jira/browse/SOLR-3790
The stack trace given in the second url coincides with the one given above
so I have applied the code change as given in the below link
http://svn.apache.org/viewvc/lucene/dev/trunk/solr/core/src/java/org/apache/solr/search/SolrIndexSearcher.java?r1=1229401&r2=1231606&diff_format=h
The first url's stack trace seems to be different.
I have two questions here. 1.) Please tell me why this exception stack trace
occurs 2.) IS there any other patch/solution available to overcome this
exception.
Please guide me.
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