[jira] [Created] (SOLR-9414) ConcurrentModificationException due to high volume of requests

["Katherine Mora (JIRA)" <ji...@apache.org>]

Katherine Mora created SOLR-9414:
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             Summary: ConcurrentModificationException due to high volume of requests
                 Key: SOLR-9414
                 URL: https://issues.apache.org/jira/browse/SOLR-9414
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
          Components: search
    Affects Versions: 5.2.1
         Environment: CentOS Linux 7


            Reporter: Katherine Mora


When having high volume of requests,  the logs are filled with this exception. 
I was able to reproduce it using 1x1, 2x4, 5x2

{noformat}
null:java.util.ConcurrentModificationException
         at java.util.LinkedHashMap$LinkedHashIterator.nextEntry(LinkedHashMap.java:394)
         at java.util.LinkedHashMap$EntryIterator.next(LinkedHashMap.java:413)
         at java.util.LinkedHashMap$EntryIterator.next(LinkedHashMap.java:412)
         at org.apache.solr.common.params.ModifiableSolrParams.toString(ModifiableSolrParams.java:201)
         at java.lang.String.valueOf(String.java:2849)
         at java.lang.StringBuilder.append(StringBuilder.java:128)
         at org.apache.solr.request.SolrQueryRequestBase.toString(SolrQueryRequestBase.java:165)
         at org.apache.solr.search.stats.LocalStatsCache.get(LocalStatsCache.java:40)
         at org.apache.solr.handler.component.QueryComponent.process(QueryComponent.java:366)
         at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:255)
         at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:143)
         at org.apache.solr.core.SolrCore.execute(SolrCore.java:2064)
         at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:654)
         at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:450)
         at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:227)
         at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:196)
         at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
         at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
         at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
         at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
         at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
         at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
         at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
         at org.eclipse.jetty.server.handler.RequestLogHandler.handle(RequestLogHandler.java:95)
         at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1129)
         at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
         at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
         at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
         at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
         at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215)
         at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110)
         at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
         at org.eclipse.jetty.server.Server.handle(Server.java:497)
         at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310)
         at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
         at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540)
         at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
         at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
         at java.lang.Thread.run(Thread.java:745)

{noformat}




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