Prefix file update of procurement repository can cause nexus startup to take an extremely long time

This thread blocked startup for at least 30 minutes. I finally had to go in and have them manually disable discovery in the nexus.xml file for the affected repository.

I see a couple of potential problems here. First this event handler shouldn't be run on jetty startup thread. Second, it looks like there may be unnecessary work may be done by the walker? Why is it reading files to get top two levels of a directory listing?

jvm 1 | "jetty-main-thread-1" prio=10 tid=0x00002aaabc2c4800 nid=0x6e8a runnable [0x00000000418ba000]
jvm 1 | java.lang.Thread.State: RUNNABLE
jvm 1 | at java.io.FileInputStream.open(Native Method)
jvm 1 | at java.io.FileInputStream.<init>(FileInputStream.java:146)
jvm 1 | at org.sonatype.nexus.proxy.item.FileContentLocator.getInputStream(FileContentLocator.java:80)
jvm 1 | at org.sonatype.nexus.proxy.item.FileContentLocator.getContent(FileContentLocator.java:107)
jvm 1 | at org.sonatype.nexus.proxy.item.DefaultLinkPersister.getLinkPrefixBytes(DefaultLinkPersister.java:108)
jvm 1 | at org.sonatype.nexus.proxy.item.DefaultLinkPersister.isLinkContent(DefaultLinkPersister.java:58)
jvm 1 | at org.sonatype.nexus.proxy.storage.local.fs.DefaultFSLocalRepositoryStorage.retrieveItemFromFile(DefaultFSLocalRepositoryStorage.java:214)
jvm 1 | at org.sonatype.nexus.proxy.storage.local.fs.DefaultFSLocalRepositoryStorage.listItems(DefaultFSLocalRepositoryStorage.java:430)
jvm 1 | at org.sonatype.nexus.proxy.repository.AbstractRepository.doListItems(AbstractRepository.java:1234)
jvm 1 | at org.sonatype.nexus.proxy.maven.AbstractMavenRepository.doListItems(AbstractMavenRepository.java:506)
jvm 1 | at org.sonatype.nexus.proxy.repository.AbstractRepository.list(AbstractRepository.java:1070)
jvm 1 | at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:207)
jvm 1 | at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:226)
jvm 1 | at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:226)
jvm 1 | at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:226)
jvm 1 | at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:226)
jvm 1 | at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:226)
jvm 1 | at org.sonatype.nexus.proxy.walker.DefaultWalker.walk(DefaultWalker.java:90)
jvm 1 | at org.sonatype.nexus.proxy.maven.routing.internal.LocalContentDiscovererImpl.discoverLocalContent(LocalContentDiscovererImpl.java:83)
jvm 1 | at org.sonatype.nexus.proxy.maven.routing.internal.ManagerImpl.updateProxyPrefixFile(ManagerImpl.java:591)
jvm 1 | at org.sonatype.nexus.proxy.maven.routing.internal.ManagerImpl.forceProxyQuickUpdatePrefixFile(ManagerImpl.java:383)
jvm 1 | at com.sonatype.nexus.procurement.ProcurementAutoroutingEventHandler.inspect(ProcurementAutoroutingEventHandler.java:90)
jvm 1 | at org.sonatype.nexus.events.EventSubscriberHost$EventInspectorAdapter.inspect(EventSubscriberHost.java:223)
jvm 1 | at org.sonatype.nexus.events.EventSubscriberHost$EventInspectorAdapter.on(EventSubscriberHost.java:214)
jvm 1 | at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
jvm 1 | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
jvm 1 | at java.lang.reflect.Method.invoke(Method.java:606)
jvm 1 | at org.sonatype.sisu.goodies.eventbus.internal.guava.EventHandler.handleEvent(EventHandler.java:80)
jvm 1 | at org.sonatype.sisu.goodies.eventbus.internal.guava.EventBus.dispatch(EventBus.java:329)
jvm 1 | at org.sonatype.sisu.goodies.eventbus.internal.DefaultGuavaEventBus.dispatch(DefaultGuavaEventBus.java:34)
jvm 1 | at org.sonatype.sisu.goodies.eventbus.internal.ReentrantGuavaEventBus.dispatchQueuedEvents(ReentrantGuavaEventBus.java:57)
jvm 1 | at org.sonatype.sisu.goodies.eventbus.internal.guava.EventBus.post(EventBus.java:281)
jvm 1 | at org.sonatype.sisu.goodies.eventbus.internal.DefaultEventBus.post(DefaultEventBus.java:78)
jvm 1 | at org.sonatype.nexus.proxy.maven.routing.internal.ManagerImpl.startup(ManagerImpl.java:200)
jvm 1 | at org.sonatype.nexus.proxy.maven.routing.internal.ManagerImpl.onNexusStartedEvent(ManagerImpl.java:995)
jvm 1 | at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
jvm 1 | at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
jvm 1 | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
jvm 1 | at java.lang.reflect.Method.invoke(Method.java:606)
jvm 1 | at org.sonatype.sisu.goodies.eventbus.internal.guava.EventHandler.handleEvent(EventHandler.java:80)
jvm 1 | at org.sonatype.sisu.goodies.eventbus.internal.guava.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:49)
jvm 1 | - locked <0x0000000712ebf598> (a org.sonatype.sisu.goodies.eventbus.internal.guava.SynchronizedEventHandler)
jvm 1 | at org.sonatype.sisu.goodies.eventbus.internal.guava.EventBus.dispatch(EventBus.java:329)
jvm 1 | at org.sonatype.sisu.goodies.eventbus.internal.DefaultGuavaEventBus.dispatch(DefaultGuavaEventBus.java:34)
jvm 1 | at org.sonatype.sisu.goodies.eventbus.internal.ReentrantGuavaEventBus.dispatchQueuedEvents(ReentrantGuavaEventBus.java:57)
jvm 1 | at org.sonatype.sisu.goodies.eventbus.internal.guava.EventBus.post(EventBus.java:281)
jvm 1 | at org.sonatype.sisu.goodies.eventbus.internal.DefaultEventBus.post(DefaultEventBus.java:78)
jvm 1 | at org.sonatype.nexus.NxApplication.doStart(NxApplication.java:167)
jvm 1 | at org.sonatype.sisu.goodies.lifecycle.LifecycleSupport$Handler.doStart(LifecycleSupport.java:70)
jvm 1 | at org.sonatype.sisu.goodies.lifecycle.LifecycleHandlerContext$MainMap_Starting.started(LifecycleHandlerContext.java:255)
jvm 1 | at org.sonatype.sisu.goodies.lifecycle.LifecycleHandlerContext.started(LifecycleHandlerContext.java:57)
jvm 1 | - locked <0x0000000707193da8> (a org.sonatype.sisu.goodies.lifecycle.LifecycleHandlerContext)
jvm 1 | at org.sonatype.sisu.goodies.lifecycle.LifecycleSupport.start(LifecycleSupport.java:129)
jvm 1 | - locked <0x0000000707193d98> (a org.sonatype.sisu.goodies.common.Mutex)
jvm 1 | at org.sonatype.nexus.web.NexusBooterListener.contextInitialized(NexusBooterListener.java:37)
jvm 1 | at org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:775)
jvm 1 | at org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:424)
jvm 1 | at org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:767)
jvm 1 | at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:249)
jvm 1 | at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1252)
jvm 1 | at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:710)
jvm 1 | at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:494)
jvm 1 | at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
jvm 1 | - locked <0x0000000706440770> (a java.lang.Object)
jvm 1 | at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:95)
jvm 1 | at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
jvm 1 | - locked <0x00000007064c1948> (a java.lang.Object)
jvm 1 | at org.eclipse.jetty.server.handler.HandlerCollection.doStart(HandlerCollection.java:229)
jvm 1 | at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
jvm 1 | - locked <0x00000007064c17e0> (a java.lang.Object)
jvm 1 | at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:95)
jvm 1 | at org.eclipse.jetty.server.Server.doStart(Server.java:282)
jvm 1 | at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
jvm 1 | - locked <0x0000000706440890> (a java.lang.Object)
jvm 1 | at org.sonatype.sisu.jetty.Jetty8$JettyWrapperThread.run(Jetty8.java:145)