Full The error message visible in the admin UI is "A metric named ADMIN./admin/ping.requestTimes already exists"
Below is the full ERROR entry from the logfile when the core swap is attempted. This is from the binary 6.4.0 release:
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2017-01-30 22:18:20.746 ERROR (qtp1769597131-22) [ ] o.a.s.h.RequestHandlerBase java.lang.IllegalArgumentException: A metric named ADMIN./admin/ping.requestTimes already exists
at com.codahale.metrics.MetricRegistry.register(MetricRegistry.java:91)
at com.codahale.metrics.MetricRegistry.registerAll(MetricRegistry.java:389)
at com.codahale.metrics.MetricRegistry.registerAll(MetricRegistry.java:104)
at org.apache.solr.metrics.SolrMetricManager.moveMetrics(SolrMetricManager.java:227)
at org.apache.solr.metrics.SolrCoreMetricManager.afterCoreSetName(SolrCoreMetricManager.java:76)
at org.apache.solr.core.SolrCore.setName(SolrCore.java:423)
at org.apache.solr.core.SolrCores.swap(SolrCores.java:243)
at org.apache.solr.core.CoreContainer.swap(CoreContainer.java:1012)
at org.apache.solr.handler.admin.CoreAdminOperation.lambda$static$3(CoreAdminOperation.java:122)
at org.apache.solr.handler.admin.CoreAdminOperation.execute(CoreAdminOperation.java:377)
at org.apache.solr.handler.admin.CoreAdminHandler$CallInfo.call(CoreAdminHandler.java:379)
at org.apache.solr.handler.admin.CoreAdminHandler.handleRequestBody(CoreAdminHandler.java:165)
at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:166)
at org.apache.solr.servlet.HttpSolrCall.handleAdminRequest(HttpSolrCall.java:664)
at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:445)
at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:345)
at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:296)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1691)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:582)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213)
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:119)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
at org.eclipse.jetty.server.Server.handle(Server.java:534)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:320)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)
at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671)
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589)
at java.lang.Thread.run(Thread.java:745)
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