scwhittle commented on issue #29926:
URL: https://github.com/apache/beam/issues/29926#issuecomment-2467604486
This was observed again recently. Looking at thread stacks showed that the
futures that should be running to flush files were not stuck but were instead
neither running nor scheduled. Full thread stacks are below.
I believe that this may be an issue with the use of ForkJoinPool in beam's
MoreFutures.runAsync . The common pool is not suitable for asynchronous
non-joining work and I believe that might be the case due to the indirect
notification of futures in this method. I believe that #33042 may fix the
issue by ensuring that the futures we join upon are directly those submitted to
the ForkJoinPool.
```
--- Threads (10): [Thread[gcs-async-channel-pool-0,5,main],
Thread[gcs-async-channel-pool-0,5,main],
Thread[gcs-async-channel-pool-0,5,main],
Thread[gcs-async-channel-pool-0,5,main],
Thread[gcs-async-channel-pool-0,5,main],
Thread[gcs-async-channel-pool-0,5,main],
Thread[gcs-async-channel-pool-0,5,main],
Thread[gcs-async-channel-pool-0,5,main],
Thread[gcs-async-channel-pool-0,5,main],
Thread[gcs-async-channel-pool-0,5,main]] State: TIMED_WAITING stack: ---
[email protected]/java.lang.Object.wait(Native Method)
[email protected]/java.io.PipedInputStream.read(PipedInputStream.java:326)
[email protected]/java.io.PipedInputStream.read(PipedInputStream.java:377)
app//com.google.api.client.util.ByteStreams.read(ByteStreams.java:172)
app//com.google.api.client.googleapis.media.MediaHttpUploader.buildContentChunk(MediaHttpUploader.java:610)
app//com.google.api.client.googleapis.media.MediaHttpUploader.resumableUpload(MediaHttpUploader.java:380)
app//com.google.api.client.googleapis.media.MediaHttpUploader.upload(MediaHttpUploader.java:308)
app//com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:566)
app//com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:493)
app//com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:603)
app//com.google.cloud.hadoop.util.AbstractGoogleAsyncWriteChannel$UploadOperation.call(AbstractGoogleAsyncWriteChannel.java:85)
[email protected]/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[email protected]/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
[email protected]/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
[email protected]/java.lang.Thread.run(Thread.java:829)
--- Threads (10): [Thread[DataflowWorkUnits-1430477,5,main],
Thread[DataflowWorkUnits-1430764,5,main],
Thread[DataflowWorkUnits-1430492,5,main],
Thread[DataflowWorkUnits-1430575,5,main],
Thread[DataflowWorkUnits-1430643,5,main],
Thread[DataflowWorkUnits-1430870,5,main],
Thread[DataflowWorkUnits-1430846,5,main],
Thread[DataflowWorkUnits-1430637,5,main],
Thread[DataflowWorkUnits-1430662,5,main],
Thread[DataflowWorkUnits-1430774,5,main]] State: WAITING stack: ---
[email protected]/jdk.internal.misc.Unsafe.park(Native Method)
[email protected]/java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
[email protected]/java.util.concurrent.CompletableFuture$Signaller.block(CompletableFuture.java:1796)
[email protected]/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3128)
[email protected]/java.util.concurrent.CompletableFuture.waitingGet(CompletableFuture.java:1823)
[email protected]/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1998)
app//org.apache.beam.sdk.util.MoreFutures.get(MoreFutures.java:61)
app//org.apache.beam.sdk.io.WriteFiles$WriteShardsIntoTempFilesFn.finishBundle(WriteFiles.java:1225)
app//org.apache.beam.sdk.io.WriteFiles$WriteShardsIntoTempFilesFn$DoFnInvoker.invokeFinishBundle(Unknown
Source)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.apache.beam.runners.core.SimpleDoFnRunner.finishBundle(SimpleDoFnRunner.java:222)
app//org.apache.beam.runners.dataflow.worker.SimpleParDoFn.finishBundle(SimpleParDoFn.java:433)
app//org.apache.beam.runners.dataflow.worker.util.common.worker.ParDoOperation.finish(ParDoOperation.java:56)
app//org.apache.beam.runners.dataflow.worker.util.common.worker.MapTaskExecutor.execute(MapTaskExecutor.java:94)
app//org.apache.beam.runners.dataflow.worker.streaming.ComputationWorkExecutor.executeWork(ComputationWorkExecutor.java:78)
app//org.apache.beam.runners.dataflow.worker.windmill.work.processing.StreamingWorkScheduler.executeWork(StreamingWorkScheduler.java:377)
app//org.apache.beam.runners.dataflow.worker.windmill.work.processing.StreamingWorkScheduler.processWork(StreamingWorkScheduler.java:252)
app//org.apache.beam.runners.dataflow.worker.windmill.work.processing.StreamingWorkScheduler.lambda$scheduleWork$2(StreamingWorkScheduler.java:211)
app//org.apache.beam.runners.dataflow.worker.windmill.work.processing.StreamingWorkScheduler$$Lambda$299/0x0000000800476440.accept(Unknown
Source)
app//org.apache.beam.runners.dataflow.worker.streaming.ExecutableWork.run(ExecutableWork.java:38)
app//org.apache.beam.runners.dataflow.worker.util.BoundedQueueExecutor.lambda$executeMonitorHeld$0(BoundedQueueExecutor.java:232)
app//org.apache.beam.runners.dataflow.worker.util.BoundedQueueExecutor$$Lambda$301/0x0000000800475040.run(Unknown
Source)
[email protected]/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
[email protected]/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
[email protected]/java.lang.Thread.run(Thread.java:829)
--- Threads (10): [Thread[pool-60-thread-1,5,main],
Thread[pool-62-thread-1,5,main], Thread[pool-58-thread-1,5,main],
Thread[pool-55-thread-1,5,main], Thread[pool-59-thread-1,5,main],
Thread[pool-56-thread-1,5,main], Thread[pool-53-thread-1,5,main],
Thread[pool-54-thread-1,5,main], Thread[pool-61-thread-1,5,main],
Thread[pool-57-thread-1,5,main]] State: WAITING stack: ---
[email protected]/java.lang.Object.wait(Native Method)
[email protected]/java.lang.Object.wait(Object.java:328)
app//org.apache.beam.sdk.util.UnboundedScheduledExecutorService$TaskLauncher.call(UnboundedScheduledExecutorService.java:303)
app//org.apache.beam.sdk.util.UnboundedScheduledExecutorService$TaskLauncher.call(UnboundedScheduledExecutorService.java:280)
[email protected]/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[email protected]/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
[email protected]/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
[email protected]/java.lang.Thread.run(Thread.java:829)
--- Threads (4): [Thread[Connector-Scheduler-26c89563-1,5,main],
Thread[ReportWorkerMessage,5,main], Thread[GlobalWorkerUpdates,5,main],
Thread[RefreshWork,5,main]] State: TIMED_WAITING stack: ---
[email protected]/jdk.internal.misc.Unsafe.park(Native Method)
[email protected]/java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:234)
[email protected]/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2123)
[email protected]/java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1182)
[email protected]/java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:899)
[email protected]/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1054)
[email protected]/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1114)
[email protected]/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
[email protected]/java.lang.Thread.run(Thread.java:829)
--- Threads (3): [Thread[qtp1152554134-23,5,main],
Thread[qtp1152554134-24,5,main], Thread[qtp1152554134-20,5,main]] State:
TIMED_WAITING stack: ---
[email protected]/jdk.internal.misc.Unsafe.park(Native Method)
[email protected]/java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:234)
[email protected]/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2123)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.eclipse.jetty.util.BlockingArrayQueue.poll(BlockingArrayQueue.java:382)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.idleJobPoll(QueuedThreadPool.java:974)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1018)
[email protected]/java.lang.Thread.run(Thread.java:829)
--- Threads (2): [Thread[ForkJoinPool.commonPool-worker-1,5,main],
Thread[ForkJoinPool.commonPool-worker-7,5,main]] State: WAITING stack: ---
[email protected]/jdk.internal.misc.Unsafe.park(Native Method)
[email protected]/java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
[email protected]/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1628)
[email protected]/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183)
--- Threads (2): [Thread[qtp1152554134-22,5,main],
Thread[qtp1152554134-25,5,main]] State: RUNNABLE stack: ---
[email protected]/sun.nio.ch.EPoll.wait(Native Method)
[email protected]/sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:120)
[email protected]/sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:124)
[email protected]/sun.nio.ch.SelectorImpl.select(SelectorImpl.java:141)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.eclipse.jetty.io.ManagedSelector.nioSelect(ManagedSelector.java:183)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.eclipse.jetty.io.ManagedSelector.select(ManagedSelector.java:190)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.eclipse.jetty.io.ManagedSelector$SelectorProducer.select(ManagedSelector.java:606)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.eclipse.jetty.io.ManagedSelector$SelectorProducer.produce(ManagedSelector.java:543)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produceTask(EatWhatYouKill.java:362)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:186)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:173)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:409)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:883)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1034)
[email protected]/java.lang.Thread.run(Thread.java:829)
--- Threads (2): [Thread[Signal Dispatcher,9,system],
Thread[DestroyJavaVM,5,main]] State: RUNNABLE stack: ---
--- Threads (1): [Thread[Reference Handler,10,system]] State: RUNNABLE
stack: ---
[email protected]/java.lang.ref.Reference.waitForReferencePendingList(Native
Method)
[email protected]/java.lang.ref.Reference.processPendingReferences(Reference.java:241)
[email protected]/java.lang.ref.Reference$ReferenceHandler.run(Reference.java:213)
--- Threads (1): [Thread[RMI TCP Accept-0,5,system]] State: RUNNABLE stack:
---
[email protected]/java.net.PlainSocketImpl.socketAccept(Native Method)
[email protected]/java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:474)
[email protected]/java.net.ServerSocket.implAccept(ServerSocket.java:565)
[email protected]/java.net.ServerSocket.accept(ServerSocket.java:533)
[email protected]/sun.management.jmxremote.LocalRMIServerSocketFactory$1.accept(LocalRMIServerSocketFactory.java:52)
[email protected]/sun.rmi.transport.tcp.TCPTransport$AcceptLoop.executeAcceptLoop(TCPTransport.java:394)
[email protected]/sun.rmi.transport.tcp.TCPTransport$AcceptLoop.run(TCPTransport.java:366)
[email protected]/java.lang.Thread.run(Thread.java:829)
--- Threads (1): [Thread[OpenCensus.Disruptor-0,5,main]] State:
TIMED_WAITING stack: ---
[email protected]/jdk.internal.misc.Unsafe.park(Native Method)
[email protected]/java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:357)
app//com.lmax.disruptor.SleepingWaitStrategy.applyWaitMethod(SleepingWaitStrategy.java:92)
app//com.lmax.disruptor.SleepingWaitStrategy.waitFor(SleepingWaitStrategy.java:65)
app//com.lmax.disruptor.ProcessingSequenceBarrier.waitFor(ProcessingSequenceBarrier.java:56)
app//com.lmax.disruptor.BatchEventProcessor.processEvents(BatchEventProcessor.java:159)
app//com.lmax.disruptor.BatchEventProcessor.run(BatchEventProcessor.java:125)
[email protected]/java.lang.Thread.run(Thread.java:829)
--- Threads (1): [Thread[ExportComponent.ServiceExporterThread-0,5,main]]
State: TIMED_WAITING stack: ---
[email protected]/java.lang.Object.wait(Native Method)
app//io.opencensus.implcore.trace.export.SpanExporterImpl$Worker.run(SpanExporterImpl.java:278)
[email protected]/java.lang.Thread.run(Thread.java:829)
--- Threads (1): [Thread[state-sampler-0,5,main]] State: TIMED_WAITING
stack: ---
[email protected]/java.lang.Thread.sleep(Native Method)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.apache.beam.runners.core.metrics.ExecutionStateSampler.lambda$start$0(ExecutionStateSampler.java:114)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.apache.beam.runners.core.metrics.ExecutionStateSampler$$Lambda$282/0x0000000800422840.call(Unknown
Source)
[email protected]/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[email protected]/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
[email protected]/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
[email protected]/java.lang.Thread.run(Thread.java:829)
--- Threads (1): [Thread[Finalizer,8,system]] State: WAITING stack: ---
[email protected]/java.lang.Object.wait(Native Method)
[email protected]/java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:155)
[email protected]/java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:176)
[email protected]/java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:170)
--- Threads (1): [Thread[Common-Cleaner,8,InnocuousThreadGroup]] State:
TIMED_WAITING stack: ---
[email protected]/java.lang.Object.wait(Native Method)
[email protected]/java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:155)
[email protected]/jdk.internal.ref.CleanerImpl.run(CleanerImpl.java:148)
[email protected]/java.lang.Thread.run(Thread.java:829)
[email protected]/jdk.internal.misc.InnocuousThread.run(InnocuousThread.java:161)
--- Threads (1): [Thread[CommitThread-0,10,main]] State: WAITING stack: ---
[email protected]/jdk.internal.misc.Unsafe.park(Native Method)
[email protected]/java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
[email protected]/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2081)
[email protected]/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:433)
app//org.apache.beam.runners.dataflow.worker.streaming.WeightedBoundedQueue.take(WeightedBoundedQueue.java:88)
app//org.apache.beam.runners.dataflow.worker.windmill.client.commits.StreamingApplianceWorkCommitter.commitLoop(StreamingApplianceWorkCommitter.java:113)
app//org.apache.beam.runners.dataflow.worker.windmill.client.commits.StreamingApplianceWorkCommitter$$Lambda$283/0x0000000800422040.run(Unknown
Source)
[email protected]/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
[email protected]/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[email protected]/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
[email protected]/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
[email protected]/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
[email protected]/java.lang.Thread.run(Thread.java:829)
--- Threads (1):
[Thread[qtp1152554134-21-acceptor-0@1b8f4a92-ServerConnector@26c89563{HTTP/1.1,
(http/1.1)}{0.0.0.0:8081},3,main]] State: RUNNABLE stack: ---
[email protected]/sun.nio.ch.ServerSocketChannelImpl.accept0(Native Method)
[email protected]/sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:533)
[email protected]/sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:285)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.eclipse.jetty.server.ServerConnector.accept(ServerConnector.java:388)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.eclipse.jetty.server.AbstractConnector$Acceptor.run(AbstractConnector.java:704)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:883)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1034)
[email protected]/java.lang.Thread.run(Thread.java:829)
--- Threads (1): [Thread[qtp1152554134-26,5,main]] State: TIMED_WAITING
stack: ---
[email protected]/jdk.internal.misc.Unsafe.park(Native Method)
[email protected]/java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:234)
[email protected]/java.util.concurrent.SynchronousQueue$TransferStack.awaitFulfill(SynchronousQueue.java:462)
[email protected]/java.util.concurrent.SynchronousQueue$TransferStack.transfer(SynchronousQueue.java:361)
[email protected]/java.util.concurrent.SynchronousQueue.poll(SynchronousQueue.java:937)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.reservedWait(ReservedThreadExecutor.java:324)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:399)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:883)
app//org.apache.beam.runners.dataflow.worker.repackaged.org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1034)
[email protected]/java.lang.Thread.run(Thread.java:829)
--- Threads (1): [Thread[MemoryMonitor,1,main]] State: TIMED_WAITING stack:
---
[email protected]/java.lang.Object.wait(Native Method)
app//org.apache.beam.runners.dataflow.worker.util.MemoryMonitor.run(MemoryMonitor.java:594)
[email protected]/java.lang.Thread.run(Thread.java:829)
--- Threads (1): [Thread[DispatchThread,1,main]] State: TIMED_WAITING stack:
---
[email protected]/java.lang.Thread.sleep(Native Method)
[email protected]/java.lang.Thread.sleep(Thread.java:334)
[email protected]/java.util.concurrent.TimeUnit.sleep(TimeUnit.java:446)
app//org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.util.concurrent.Uninterruptibles.sleepUninterruptibly(Uninterruptibles.java:406)
app//org.apache.beam.runners.dataflow.worker.StreamingDataflowWorker.sleep(StreamingDataflowWorker.java:658)
app//org.apache.beam.runners.dataflow.worker.StreamingDataflowWorker.dispatchLoop(StreamingDataflowWorker.java:782)
app//org.apache.beam.runners.dataflow.worker.StreamingDataflowWorker.lambda$new$0(StreamingDataflowWorker.java:231)
app//org.apache.beam.runners.dataflow.worker.StreamingDataflowWorker$$Lambda$237/0x00000008003e0c40.run(Unknown
Source)
[email protected]/java.lang.Thread.run(Thread.java:829)
--- Threads (1): [Thread[RMI TCP Accept-5555,5,system]] State: RUNNABLE
stack: ---
[email protected]/java.net.PlainSocketImpl.socketAccept(Native Method)
[email protected]/java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:474)
[email protected]/java.net.ServerSocket.implAccept(ServerSocket.java:565)
[email protected]/java.net.ServerSocket.accept(ServerSocket.java:533)
[email protected]/sun.rmi.transport.tcp.TCPTransport$AcceptLoop.executeAcceptLoop(TCPTransport.java:394)
[email protected]/sun.rmi.transport.tcp.TCPTransport$AcceptLoop.run(TCPTransport.java:366)
[email protected]/java.lang.Thread.run(Thread.java:829)
--- Threads (1): [Thread[Keep-Alive-SocketCleaner,8,InnocuousThreadGroup]]
State: WAITING stack: ---
[email protected]/java.lang.Object.wait(Native Method)
[email protected]/sun.net.www.http.KeepAliveStreamCleaner.run(KeepAliveStreamCleaner.java:101)
[email protected]/java.lang.Thread.run(Thread.java:829)
[email protected]/jdk.internal.misc.InnocuousThread.run(InnocuousThread.java:161)
--- Threads (1): [Thread[Keep-Alive-Timer,8,InnocuousThreadGroup]] State:
TIMED_WAITING stack: ---
[email protected]/java.lang.Thread.sleep(Native Method)
[email protected]/sun.net.www.http.KeepAliveCache.run(KeepAliveCache.java:222)
[email protected]/java.lang.Thread.run(Thread.java:829)
[email protected]/jdk.internal.misc.InnocuousThread.run(InnocuousThread.java:161)
```
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