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Posted to commits@druid.apache.org by GitBox <gi...@apache.org> on 2019/02/27 22:32:16 UTC
[GitHub] justinborromeo opened a new issue #7153: KafkaConsumer
ConcurrentModificationException Upon Supervisor Shutdown
justinborromeo opened a new issue #7153: KafkaConsumer ConcurrentModificationException Upon Supervisor Shutdown
URL: https://github.com/apache/incubator-druid/issues/7153
# Affected Version
`master` branch.
# Description
I encountered the following error message twice when performing the following sequence of actions:
1. Create a supervisor using the example spec provided by the [docs](http://druid.io/docs/latest/development/extensions-core/kafka-ingestion.html) and the `/druid/indexer/v1/supervisor` endpoint
2. Get a list of all supervisors (GET `/druid/indexer/v1/supervisor?full`)
3. Terminate all supervisors (POST `/druid/indexer/v1/supervisor/terminateAll`)
It doesn't consistently occur as it only appeared twice in ~10 runs. @dclim has mentioned that he's seen that exception before but not when stopping a supervisor.
Within the context of stopping a supervisor, it seems as if the bug's impact is minimal since the supervisor is stopped and its existence deleted from the metadata store.
Cluster Info:
- Running all nodes and Zookeeper on a Macbook Pro
- Overlord was running in Intellij
- MySQL used as a metadata store
Configurations:
- The default config was used except `druid-kafka-indexing-service` was included in the extensions loadList
# Log
```
2019-02-27T21:15:58,878 INFO [qtp1788582153-83] org.apache.druid.indexing.seekablestream.supervisor.SeekableStreamSupervisor - Beginning shutdown of [KafkaSupervisor-metrics-kafka]
2019-02-27T21:15:58,879 ERROR [qtp1788582153-83] org.apache.druid.indexing.seekablestream.supervisor.SeekableStreamSupervisor - Exception stopping [KafkaSupervisor-metrics-kafka]: {class=org.apache.druid.indexing.seekablestream.supervisor.SeekableStreamSupervisor, exceptionType=class java.util.ConcurrentModificationException, exceptionMessage=KafkaConsumer is not safe for multi-threaded access}
java.util.ConcurrentModificationException: KafkaConsumer is not safe for multi-threaded access
at org.apache.kafka.clients.consumer.KafkaConsumer.acquire(KafkaConsumer.java:2201) ~[?:?]
at org.apache.kafka.clients.consumer.KafkaConsumer.close(KafkaConsumer.java:2090) ~[?:?]
at org.apache.kafka.clients.consumer.KafkaConsumer.close(KafkaConsumer.java:2045) ~[?:?]
at org.apache.druid.indexing.kafka.KafkaRecordSupplier.close(KafkaRecordSupplier.java:168) ~[?:?]
at org.apache.druid.indexing.seekablestream.supervisor.SeekableStreamSupervisor.stop(SeekableStreamSupervisor.java:638) ~[classes/:?]
at org.apache.druid.indexing.overlord.supervisor.SupervisorManager.possiblyStopAndRemoveSupervisorInternal(SupervisorManager.java:249) ~[classes/:?]
at org.apache.druid.indexing.overlord.supervisor.SupervisorManager.lambda$stopAndRemoveAllSupervisors$0(SupervisorManager.java:111) ~[classes/:?]
at java.util.concurrent.ConcurrentHashMap$KeySetView.forEach(ConcurrentHashMap.java:4649) ~[?:1.8.0_191]
at org.apache.druid.indexing.overlord.supervisor.SupervisorManager.stopAndRemoveAllSupervisors(SupervisorManager.java:111) ~[classes/:?]
at org.apache.druid.indexing.overlord.supervisor.SupervisorResource.lambda$terminateAll$8(SupervisorResource.java:286) ~[classes/:?]
at org.apache.druid.indexing.overlord.supervisor.SupervisorResource.asLeaderWithSupervisorManager(SupervisorResource.java:371) [classes/:?]
at org.apache.druid.indexing.overlord.supervisor.SupervisorResource.terminateAll(SupervisorResource.java:284) [classes/:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_191]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_191]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_191]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_191]
at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60) [jersey-server-1.19.3.jar:1.19.3]
at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205) [jersey-server-1.19.3.jar:1.19.3]
at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75) [jersey-server-1.19.3.jar:1.19.3]
at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302) [jersey-server-1.19.3.jar:1.19.3]
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) [jersey-server-1.19.3.jar:1.19.3]
at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108) [jersey-server-1.19.3.jar:1.19.3]
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) [jersey-server-1.19.3.jar:1.19.3]
at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84) [jersey-server-1.19.3.jar:1.19.3]
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1542) [jersey-server-1.19.3.jar:1.19.3]
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1473) [jersey-server-1.19.3.jar:1.19.3]
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419) [jersey-server-1.19.3.jar:1.19.3]
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409) [jersey-server-1.19.3.jar:1.19.3]
at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409) [jersey-servlet-1.19.3.jar:1.19.3]
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:558) [jersey-servlet-1.19.3.jar:1.19.3]
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:733) [jersey-servlet-1.19.3.jar:1.19.3]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) [javax.servlet-api-3.1.0.jar:3.1.0]
at com.google.inject.servlet.ServletDefinition.doServiceImpl(ServletDefinition.java:286) [guice-servlet-4.1.0.jar:?]
at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:276) [guice-servlet-4.1.0.jar:?]
at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:181) [guice-servlet-4.1.0.jar:?]
at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91) [guice-servlet-4.1.0.jar:?]
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:85) [guice-servlet-4.1.0.jar:?]
at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:120) [guice-servlet-4.1.0.jar:?]
at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:135) [guice-servlet-4.1.0.jar:?]
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642) [jetty-servlet-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.apache.druid.server.http.RedirectFilter.doFilter(RedirectFilter.java:71) [classes/:?]
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642) [jetty-servlet-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.apache.druid.server.security.PreResponseAuthorizationCheckFilter.doFilter(PreResponseAuthorizationCheckFilter.java:82) [classes/:?]
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642) [jetty-servlet-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.apache.druid.server.security.AllowOptionsResourceFilter.doFilter(AllowOptionsResourceFilter.java:75) [classes/:?]
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642) [jetty-servlet-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.apache.druid.server.security.AllowAllAuthenticator$1.doFilter(AllowAllAuthenticator.java:84) [classes/:?]
at org.apache.druid.server.security.AuthenticationWrappingFilter.doFilter(AuthenticationWrappingFilter.java:59) [classes/:?]
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642) [jetty-servlet-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.apache.druid.server.security.SecuritySanityCheckFilter.doFilter(SecuritySanityCheckFilter.java:86) [classes/:?]
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642) [jetty-servlet-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533) [jetty-servlet-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1253) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473) [jetty-servlet-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1155) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:724) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:61) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.server.Server.handle(Server.java:531) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:352) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281) [jetty-io-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102) [jetty-io-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118) [jetty-io-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333) [jetty-util-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310) [jetty-util-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168) [jetty-util-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126) [jetty-util-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366) [jetty-util-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:760) [jetty-util-9.4.10.v20180503.jar:9.4.10.v20180503]
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:678) [jetty-util-9.4.10.v20180503.jar:9.4.10.v20180503]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_191]
2019-02-27T21:15:58,885 INFO [qtp1788582153-83] org.apache.druid.java.util.emitter.core.LoggingEmitter - Event [{"feed":"alerts","timestamp":"2019-02-27T21:15:58.883Z","service":"overlord","host":"localhost:8090","version":"","severity":"component-failure","description":"Exception stopping [KafkaSupervisor-metrics-kafka]","data":{"class":"org.apache.druid.indexing.seekablestream.supervisor.SeekableStreamSupervisor","exceptionType":"java.util.ConcurrentModificationException","exceptionMessage":"KafkaConsumer is not safe for multi-threaded access","exceptionStackTrace":"java.util.ConcurrentModificationException: KafkaConsumer is not safe for multi-threaded access\n\tat org.apache.kafka.clients.consumer.KafkaConsumer.acquire(KafkaConsumer.java:2201)\n\tat org.apache.kafka.clients.consumer.KafkaConsumer.close(KafkaConsumer.java:2090)\n\tat org.apache.kafka.clients.consumer.KafkaConsumer.close(KafkaConsumer.java:2045)\n\tat org.apache.druid.indexing.kafka.KafkaRecordSupplier.close(KafkaRecordSupplier.java:168)\n\tat org.apache.druid.indexing.seekablestream.supervisor.SeekableStreamSupervisor.stop(SeekableStreamSupervisor.java:638)\n\tat org.apache.druid.indexing.overlord.supervisor.SupervisorManager.possiblyStopAndRemoveSupervisorInternal(SupervisorManager.java:249)\n\tat org.apache.druid.indexing.overlord.supervisor.SupervisorManager.lambda$stopAndRemoveAllSupervisors$0(SupervisorManager.java:111)\n\tat java.util.concurrent.ConcurrentHashMap$KeySetView.forEach(ConcurrentHashMap.java:4649)\n\tat org.apache.druid.indexing.overlord.supervisor.SupervisorManager.stopAndRemoveAllSupervisors(SupervisorManager.java:111)\n\tat org.apache.druid.indexing.overlord.supervisor.SupervisorResource.lambda$terminateAll$8(SupervisorResource.java:286)\n\tat org.apache.druid.indexing.overlord.supervisor.SupervisorResource.asLeaderWithSupervisorManager(SupervisorResource.java:371)\n\tat org.apache.druid.indexing.overlord.supervisor.SupervisorResource.terminateAll(SupervisorResource.java:284)\n\tat sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)\n\tat sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)\n\tat sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)\n\tat java.lang.reflect.Method.invoke(Method.java:498)\n\tat com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)\n\tat com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205)\n\tat com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)\n\tat com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)\n\tat com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)\n\tat com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)\n\tat com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)\n\tat com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)\n\tat com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1542)\n\tat com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1473)\n\tat com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419)\n\tat com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409)\n\tat com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409)\n\tat com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:558)\n\tat com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:733)\n\tat javax.servlet.http.HttpServlet.service(HttpServlet.java:790)\n\tat com.google.inject.servlet.ServletDefinition.doServiceImpl(ServletDefinition.java:286)\n\tat com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:276)\n\tat com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:181)\n\tat com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91)\n\tat com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:85)\n\tat com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:120)\n\tat com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:135)\n\tat org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)\n\tat org.apache.druid.server.http.RedirectFilter.doFilter(RedirectFilter.java:71)\n\tat org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)\n\tat org.apache.druid.server.security.PreResponseAuthorizationCheckFilter.doFilter(PreResponseAuthorizationCheckFilter.java:82)\n\tat org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)\n\tat org.apache.druid.server.security.AllowOptionsResourceFilter.doFilter(AllowOptionsResourceFilter.java:75)\n\tat org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)\n\tat org.apache.druid.server.security.AllowAllAuthenticator$1.doFilter(AllowAllAuthenticator.java:84)\n\tat org.apache.druid.server.security.AuthenticationWrappingFilter.doFilter(AuthenticationWrappingFilter.java:59)\n\tat org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)\n\tat org.apache.druid.server.security.SecuritySanityCheckFilter.doFilter(SecuritySanityCheckFilter.java:86)\n\tat org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)\n\tat org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)\n\tat org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)\n\tat org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)\n\tat org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)\n\tat org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1253)\n\tat org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)\n\tat org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)\n\tat org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)\n\tat org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)\n\tat org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1155)\n\tat org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)\n\tat org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:724)\n\tat org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:61)\n\tat org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)\n\tat org.eclipse.jetty.server.Server.handle(Server.java:531)\n\tat org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:352)\n\tat org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)\n\tat org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281)\n\tat org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)\n\tat org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)\n\tat org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)\n\tat org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)\n\tat org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)\n\tat org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)\n\tat org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)\n\tat org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:760)\n\tat org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:678)\n\tat java.lang.Thread.run(Thread.java:748)\n"}}]
```
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