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https://issues.apache.org/jira/browse/SOLR-9208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15380153#comment-15380153
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Mikhail Khludnev commented on SOLR-9208:
----------------------------------------
[[email protected]], I'm afraid it's not an issue, but a topic to
discuss in mailing list. Attaching a test case and the brief code makes a lot
of sense.
> ConcurrentModificationException on SolrCore.close() resulting in abnormal CPU
> consumption
> -----------------------------------------------------------------------------------------
>
> Key: SOLR-9208
> URL: https://issues.apache.org/jira/browse/SOLR-9208
> Project: Solr
> Issue Type: Bug
> Components: multicore, Server
> Affects Versions: 6.0
> Reporter: Fabrizio Fortino
> Assignee: Mikhail Khludnev
>
> In our use case we swap two cores and close the old one. We started seeing
> the below error from time to time (it's completely random, we are unable to
> reproduce it). Moreover we have noticed that when this Exception is thrown
> the CPU consumption goes pretty high (80-100%).
> Error Message:
> java.util.ConcurrentModificationException:
> java.util.ConcurrentModificationException
> StackTrace:
> java.util.ArrayList$Itr.checkForComodification (ArrayList.java:901)
> java.util.ArrayList$Itr.next (ArrayList.java:851)
> org.apache.solr.core.SolrCore.close (SolrCore.java:1134)
> org.apache.solr.servlet.HttpSolrCall.destroy (HttpSolrCall.java:513)
> org.apache.solr.servlet.SolrDispatchFilter.doFilter
> (SolrDispatchFilter.java:242)
> org.apache.solr.servlet.SolrDispatchFilter.doFilter
> (SolrDispatchFilter.java:184)
> …ipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1668)
> org.eclipse.jetty.servlet.ServletHandler.doHandle (ServletHandler.java:581)
> org.eclipse.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:143)
> org.eclipse.jetty.security.SecurityHandler.handle (SecurityHandler.java:548)
> …g.eclipse.jetty.server.session.SessionHandler.doHandle
> (SessionHandler.java:226)
> …g.eclipse.jetty.server.handler.ContextHandler.doHandle
> (ContextHandler.java:1160)
> org.eclipse.jetty.servlet.ServletHandler.doScope (ServletHandler.java:511)
> org.eclipse.jetty.server.session.SessionHandler.doScope
> (SessionHandler.java:185)
> org.eclipse.jetty.server.handler.ContextHandler.doScope
> (ContextHandler.java:1092)
> org.eclipse.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:141)
> …e.jetty.server.handler.ContextHandlerCollection.handle
> (ContextHandlerCollection.java:213)
> ….eclipse.jetty.server.handler.HandlerCollection.handle
> (HandlerCollection.java:119)
> org.eclipse.jetty.server.handler.HandlerWrapper.handle
> (HandlerWrapper.java:134)
> org.eclipse.jetty.server.Server.handle (Server.java:518)
> org.eclipse.jetty.server.HttpChannel.handle (HttpChannel.java:308)
> org.eclipse.jetty.server.HttpConnection.onFillable (HttpConnection.java:244)
> …pse.jetty.io.AbstractConnection$ReadCallback.succeeded
> (AbstractConnection.java:273)
> org.eclipse.jetty.io.FillInterest.fillable (FillInterest.java:95)
> org.eclipse.jetty.io.SelectChannelEndPoint$2.run
> (SelectChannelEndPoint.java:93)
> …il.thread.strategy.ExecuteProduceConsume.produceAndRun
> (ExecuteProduceConsume.java:246)
> …e.jetty.util.thread.strategy.ExecuteProduceConsume.run
> (ExecuteProduceConsume.java:156)
> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob
> (QueuedThreadPool.java:654)
> org.eclipse.jetty.util.thread.QueuedThreadPool$3.run
> (QueuedThreadPool.java:572)
> java.lang.Thread.run (Thread.java:745)
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