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Lots of 'ConcurrentModificationException: null' since upgrading to 1.5.3

See original GitHub issue

Since upgrading micrometer to 1.5.3, we’re seeing load of these exceptions in our logs with warning message Error while discarding collection, stopping. This has already been mentioned in https://github.com/micrometer-metrics/micrometer/issues/2140#issuecomment-663004911 but figured I’d create a separate ticket for it.

Environment:

  • Java 11
  • Spring Boot 2.3
  • Micrometer 1.5.3
  • Using statsd
java.util.ConcurrentModificationException: null
	at java.base/java.util.ArrayList$Itr.checkForComodification(ArrayList.java:1042)
	at java.base/java.util.ArrayList$Itr.next(ArrayList.java:996)
	at io.micrometer.shaded.reactor.core.publisher.Operators.onDiscardMultiple(Operators.java:565)
	at io.micrometer.shaded.reactor.core.publisher.FluxBufferPredicate$BufferPredicateSubscriber.cancel(FluxBufferPredicate.java:174)
	at io.micrometer.shaded.reactor.core.publisher.FluxMap$MapSubscriber.cancel(FluxMap.java:160)
	at io.micrometer.shaded.reactor.core.publisher.FluxOnBackpressureLatest$LatestSubscriber.cancel(FluxOnBackpressureLatest.java:99)
	at io.micrometer.shaded.reactor.core.publisher.FluxMap$MapSubscriber.cancel(FluxMap.java:160)
	at io.micrometer.shaded.reactor.core.publisher.Operators.terminate(Operators.java:1222)
	at io.micrometer.shaded.reactor.netty.channel.MonoSendMany$SendManyInner.operationComplete(MonoSendMany.java:264)
	at io.micrometer.shaded.reactor.netty.channel.MonoSendMany$SendManyInner.operationComplete(MonoSendMany.java:114)
	at io.micrometer.shaded.io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:577)
	at io.micrometer.shaded.io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:551)
	at io.micrometer.shaded.io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:490)
	at io.micrometer.shaded.io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:615)
	at io.micrometer.shaded.io.netty.util.concurrent.DefaultPromise.setSuccess0(DefaultPromise.java:604)
	at io.micrometer.shaded.io.netty.util.concurrent.DefaultPromise.trySuccess(DefaultPromise.java:104)
	at io.micrometer.shaded.io.netty.channel.DefaultChannelPromise.trySuccess(DefaultChannelPromise.java:84)
	at io.micrometer.shaded.io.netty.channel.AbstractChannel$CloseFuture.setClosed(AbstractChannel.java:1158)
	at io.micrometer.shaded.io.netty.channel.AbstractChannel$AbstractUnsafe.doClose0(AbstractChannel.java:760)
	at io.micrometer.shaded.io.netty.channel.AbstractChannel$AbstractUnsafe.close(AbstractChannel.java:736)
	at io.micrometer.shaded.io.netty.channel.AbstractChannel$AbstractUnsafe.close(AbstractChannel.java:607)
	at io.micrometer.shaded.io.netty.channel.DefaultChannelPipeline$HeadContext.close(DefaultChannelPipeline.java:1352)
	at io.micrometer.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeClose(AbstractChannelHandlerContext.java:622)
	at io.micrometer.shaded.io.netty.channel.AbstractChannelHandlerContext.close(AbstractChannelHandlerContext.java:606)
	at io.micrometer.shaded.io.netty.channel.AbstractChannelHandlerContext.close(AbstractChannelHandlerContext.java:472)
	at io.micrometer.shaded.io.netty.channel.DefaultChannelPipeline.close(DefaultChannelPipeline.java:957)
	at io.micrometer.shaded.io.netty.channel.AbstractChannel.close(AbstractChannel.java:232)
	at io.micrometer.shaded.reactor.netty.DisposableChannel.dispose(DisposableChannel.java:76)
	at io.micrometer.shaded.reactor.netty.channel.ChannelOperations.dispose(ChannelOperations.java:168)
	at io.micrometer.shaded.reactor.core.Disposables.set(Disposables.java:421)
	at io.micrometer.shaded.reactor.core.Disposables$SwapDisposable.update(Disposables.java:317)
	at io.micrometer.statsd.StatsdMeterRegistry.lambda$retryReplaceClient$12(StatsdMeterRegistry.java:273)
	at io.micrometer.shaded.reactor.core.publisher.LambdaMonoSubscriber.onNext(LambdaMonoSubscriber.java:168)
	at io.micrometer.shaded.reactor.core.publisher.SerializedSubscriber.onNext(SerializedSubscriber.java:99)
	at io.micrometer.shaded.reactor.core.publisher.FluxRetryWhen$RetryWhenMainSubscriber.onNext(FluxRetryWhen.java:162)
	at io.micrometer.shaded.reactor.core.publisher.MonoCreate$DefaultMonoSink.success(MonoCreate.java:156)
	at io.micrometer.shaded.reactor.netty.resources.NewConnectionProvider$NewConnectionObserver.onStateChange(NewConnectionProvider.java:199)
	at io.micrometer.shaded.reactor.netty.channel.ChannelOperationsHandler.channelActive(ChannelOperationsHandler.java:65)
	at io.micrometer.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelActive(AbstractChannelHandlerContext.java:230)
	at io.micrometer.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelActive(AbstractChannelHandlerContext.java:216)
	at io.micrometer.shaded.io.netty.channel.AbstractChannelHandlerContext.fireChannelActive(AbstractChannelHandlerContext.java:209)
	at io.micrometer.shaded.io.netty.channel.DefaultChannelPipeline$HeadContext.channelActive(DefaultChannelPipeline.java:1398)
	at io.micrometer.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelActive(AbstractChannelHandlerContext.java:230)
	at io.micrometer.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelActive(AbstractChannelHandlerContext.java:216)
	at io.micrometer.shaded.io.netty.channel.DefaultChannelPipeline.fireChannelActive(DefaultChannelPipeline.java:895)
	at io.micrometer.shaded.io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.fulfillConnectPromise(AbstractNioChannel.java:305)
	at io.micrometer.shaded.io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.connect(AbstractNioChannel.java:249)
	at io.micrometer.shaded.io.netty.channel.DefaultChannelPipeline$HeadContext.connect(DefaultChannelPipeline.java:1342)
	at io.micrometer.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeConnect(AbstractChannelHandlerContext.java:548)
	at io.micrometer.shaded.io.netty.channel.AbstractChannelHandlerContext.connect(AbstractChannelHandlerContext.java:533)
	at io.micrometer.shaded.io.netty.channel.AbstractChannelHandlerContext.connect(AbstractChannelHandlerContext.java:517)
	at io.micrometer.shaded.io.netty.channel.DefaultChannelPipeline.connect(DefaultChannelPipeline.java:978)
	at io.micrometer.shaded.io.netty.channel.AbstractChannel.connect(AbstractChannel.java:253)
	at io.micrometer.shaded.io.netty.bootstrap.Bootstrap$3.run(Bootstrap.java:250)
	at io.micrometer.shaded.io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
	at io.micrometer.shaded.io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472)
	at io.micrometer.shaded.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:500)
	at io.micrometer.shaded.io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
	at io.micrometer.shaded.io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at io.micrometer.shaded.io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.base/java.lang.Thread.run(Thread.java:834)

Issue Analytics

  • State:closed
  • Created 3 years ago
  • Reactions:10
  • Comments:8 (3 by maintainers)

github_iconTop GitHub Comments

3reactions
kdamevincommented, Aug 14, 2020

I can confirm we don’t see that error anymore after bumping to 1.5.4. Thank you!

1reaction
shakuzencommented, Aug 13, 2020

I will close this with @garry-mcfly’s report that it’s no longer occurring. We are about to release 1.5.4. If users are still seeing this issue after upgrading, we can reopen this and investigate further.

Read more comments on GitHub >

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