[jboss-jira] [JBoss JIRA] (WFLY-12690) Metrics call causes java.util.ConcurrentModificationException

[Jeff Mesnil (Jira)]

    [ https://issues.jboss.org/browse/WFLY-12690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13801637#comment-13801637 ] 

Jeff Mesnil commented on WFLY-12690:
------------------------------------

Thanks I've created an issue in smallrye-metrics to guard against concurrent modification: https://github.com/smallrye/smallrye-metrics/issues/192

> Metrics call causes java.util.ConcurrentModificationException
> -------------------------------------------------------------
>
>                 Key: WFLY-12690
>                 URL: https://issues.jboss.org/browse/WFLY-12690
>             Project: WildFly
>          Issue Type: Bug
>          Components: MP Metrics
>    Affects Versions: 18.0.0.Final
>         Environment: I ran the tests in our integration test environment. This includes a prometheus, scraping the metrics with an intervall of 5s.
>            Reporter: Ralf Battenfeld
>            Assignee: Jeff Mesnil
>            Priority: Major
>
> Hi I ran our integrations tests together with prometheus calls. In Wildfly 18, I get this errors constantly:
> {code:java}
> 2019-10-18 14:22:57,284 ERROR [io.undertow.request] (management I/O-2) UT005071: Undertow request failed HttpServerExchange{ GET /metrics}: java.util.ConcurrentModificationException
> 	at java.util.HashMap$HashIterator.nextNode(HashMap.java:1445)
> 	at java.util.HashMap$EntryIterator.next(HashMap.java:1479)
> 	at java.util.HashMap$EntryIterator.next(HashMap.java:1477)
> 	at java.util.HashMap.putMapEntries(HashMap.java:512)
> 	at java.util.HashMap.<init>(HashMap.java:490)
> 	at io.smallrye.metrics.MetricsRegistryImpl.getMetadata(MetricsRegistryImpl.java:560)
> 	at io.smallrye.metrics.exporters.OpenMetricsExporter.exposeEntries(OpenMetricsExporter.java:157)
> 	at io.smallrye.metrics.exporters.OpenMetricsExporter.getEntriesForScope(OpenMetricsExporter.java:150)
> 	at io.smallrye.metrics.exporters.OpenMetricsExporter.exportAllScopes(OpenMetricsExporter.java:101)
> 	at io.smallrye.metrics.MetricsRequestHandler.handleRequest(MetricsRequestHandler.java:116)
> 	at io.smallrye.metrics.MetricsRequestHandler.handleRequest(MetricsRequestHandler.java:73)
> 	at org.wildfly.extension.microprofile.metrics.MetricsContextService$1.handleRequest(MetricsContextService.java:81)
> 	at org.jboss.as.domain.http.server.security.RealmReadinessHandler.handleRequest(RealmReadinessHandler.java:51)
> 	at org.jboss.as.domain.http.server.security.ServerErrorReadinessHandler.handleRequest(ServerErrorReadinessHandler.java:35)
> 	at io.undertow.server.handlers.PathHandler.handleRequest(PathHandler.java:91)
> 	at io.undertow.server.handlers.ChannelUpgradeHandler.handleRequest(ChannelUpgradeHandler.java:211)
> 	at io.undertow.server.handlers.cache.CacheHandler.handleRequest(CacheHandler.java:92)
> 	at io.undertow.server.handlers.error.SimpleErrorPageHandler.handleRequest(SimpleErrorPageHandler.java:78)
> 	at io.undertow.server.handlers.CanonicalPathHandler.handleRequest(CanonicalPathHandler.java:49)
> 	at org.jboss.as.domain.http.server.ManagementHttpRequestHandler.handleRequest(ManagementHttpRequestHandler.java:57)
> 	at org.jboss.as.domain.http.server.cors.CorsHttpHandler.handleRequest(CorsHttpHandler.java:75)
> 	at org.jboss.as.domain.http.server.ManagementHttpServer$UpgradeFixHandler.handleRequest(ManagementHttpServer.java:666)
> 	at io.undertow.server.Connectors.executeRootHandler(Connectors.java:376)
> 	at io.undertow.server.protocol.http.HttpReadListener.handleEventWithNoRunningRequest(HttpReadListener.java:255)
> 	at io.undertow.server.protocol.http.HttpReadListener.handleEvent(HttpReadListener.java:136)
> 	at io.undertow.server.protocol.http.HttpReadListener.handleEvent(HttpReadListener.java:59)
> 	at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92)
> 	at org.xnio.conduits.ReadReadyHandler$ChannelListenerHandler.readReady(ReadReadyHandler.java:66)
> 	at org.xnio.nio.NioSocketConduit.handleReady(NioSocketConduit.java:89)
> 	at org.xnio.nio.WorkerThread.run(WorkerThread.java:591)
> {code}



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