This is a bug. Please open a Jira issue. We need to dig where else this param map is being used. It is possible that there are more such bugs.
On Fri, Aug 12, 2016 at 10:57 PM, Katherine Mora < km...@searchtechnologies.com> wrote: > Hi All, > > We are using Solr 5.2.1 in a production environment where we have a high > volume of requests. We are not having any timeouts or performance issues. > However, the logs are filled with this exception. > We've been researching and there isn't a lot of information about this > problem or why it happens. We have tried to reproduce it by sending queries > using JMeter and it only happens when multiple queries are sent at the same > time. > > Checking the code we found that this exception is within the core Solr > code and part of the exception caught our attention as it is logging debug > information (we are using INFO logging level) (org.apache.solr.search.stats. > LocalStatsCache.get(LocalStatsCache.java:40)). > > Has anyone seen this exception before? Would it be OK to generate a patch? > We were thinking about commenting the debug line or adding try/catch > statements. > > Thank you! > > > 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) > > > KATHERINE MORA > Senior Engineer > > -- Regards, Shalin Shekhar Mangar.
