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From "Erick Erickson (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SOLR-9414) ConcurrentModificationException due to high volume of requests
Date Mon, 20 May 2019 20:22:00 GMT

     [ https://issues.apache.org/jira/browse/SOLR-9414?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Erick Erickson resolved SOLR-9414.
----------------------------------
    Resolution: Feedback Received

I can't imagine we'd be able to reproduce this 3 major versions later, plus there's not much
to go on.

If we see this on more recent Solr versions we can open a new issue.

> 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
>            Priority: Major
>
> When having high volume of requests,  the logs are filled with this exception. I have
tried to reproduce it by sending queries using JMeter and it only happens when multiple queries
are sent at the same time. 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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