[
https://issues.apache.org/jira/browse/FLINK-19489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17212319#comment-17212319
]
Stephan Ewen commented on FLINK-19489:
--------------------------------------
That sounds like a plausible explanation. Great debugging, [~kezhuw], thanks a
lot.
A fix that I am applying for FLINK-19427 should also fix this here, please
check my comment on that issue.
> SplitFetcherTest.testNotifiesWhenGoingIdleConcurrent gets stuck
> ---------------------------------------------------------------
>
> Key: FLINK-19489
> URL: https://issues.apache.org/jira/browse/FLINK-19489
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Common
> Affects Versions: 1.12.0
> Reporter: Dian Fu
> Assignee: Stephan Ewen
> Priority: Major
> Labels: test-stability
>
> https://dev.azure.com/apache-flink/apache-flink/_build/results?buildId=7158&view=logs&j=298e20ef-7951-5965-0e79-ea664ddc435e&t=b4cd3436-dbe8-556d-3bca-42f92c3cbf2f
> {code}
> 020-10-01T21:55:34.9982203Z "main" #1 prio=5 os_prio=0 cpu=1048.80ms
> elapsed=921.99s tid=0x00007f8c00015800 nid=0xf6e in Object.wait()
> [0x00007f8c06648000]
> 2020-10-01T21:55:34.9982807Z java.lang.Thread.State: WAITING (on object
> monitor)
> 2020-10-01T21:55:34.9983177Z at
> java.lang.Object.wait(java.base@11.0.7/Native Method)
> 2020-10-01T21:55:34.9983871Z - waiting on <0x000000008e0be190> (a
> org.apache.flink.connector.base.source.reader.fetcher.SplitFetcherTest$QueueDrainerThread)
> 2020-10-01T21:55:34.9984581Z at
> java.lang.Thread.join(java.base@11.0.7/Thread.java:1305)
> 2020-10-01T21:55:34.9985433Z - waiting to re-lock in wait()
> <0x000000008e0be190> (a
> org.apache.flink.connector.base.source.reader.fetcher.SplitFetcherTest$QueueDrainerThread)
> 2020-10-01T21:55:34.9985998Z at
> org.apache.flink.core.testutils.CheckedThread.trySync(CheckedThread.java:112)
> 2020-10-01T21:55:34.9986511Z at
> org.apache.flink.core.testutils.CheckedThread.sync(CheckedThread.java:100)
> 2020-10-01T21:55:34.9987004Z at
> org.apache.flink.core.testutils.CheckedThread.sync(CheckedThread.java:89)
> 2020-10-01T21:55:34.9987707Z at
> org.apache.flink.connector.base.source.reader.fetcher.SplitFetcherTest$QueueDrainerThread.shutdown(SplitFetcherTest.java:301)
> 2020-10-01T21:55:34.9988427Z at
> org.apache.flink.connector.base.source.reader.fetcher.SplitFetcherTest.testNotifiesWhenGoingIdleConcurrent(SplitFetcherTest.java:131)
> 2020-10-01T21:55:34.9989025Z at
> jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(java.base@11.0.7/Native
> Method)
> 2020-10-01T21:55:34.9989531Z at
> jdk.internal.reflect.NativeMethodAccessorImpl.invoke(java.base@11.0.7/NativeMethodAccessorImpl.java:62)
> 2020-10-01T21:55:34.9990117Z at
> jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(java.base@11.0.7/DelegatingMethodAccessorImpl.java:43)
> 2020-10-01T21:55:34.9990626Z at
> java.lang.reflect.Method.invoke(java.base@11.0.7/Method.java:566)
> 2020-10-01T21:55:34.9991078Z at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
> 2020-10-01T21:55:34.9991602Z at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> 2020-10-01T21:55:34.9992119Z at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
> 2020-10-01T21:55:34.9992749Z at
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
> 2020-10-01T21:55:34.9993229Z at
> org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
> 2020-10-01T21:55:34.9993700Z at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
> 2020-10-01T21:55:34.9994202Z at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
> 2020-10-01T21:55:34.9994670Z at
> org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
> 2020-10-01T21:55:34.9995098Z at
> org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
> 2020-10-01T21:55:34.9995524Z at
> org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
> 2020-10-01T21:55:34.9995965Z at
> org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
> 2020-10-01T21:55:34.9996403Z at
> org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
> 2020-10-01T21:55:34.9996816Z at
> org.junit.runners.ParentRunner.run(ParentRunner.java:363)
> 2020-10-01T21:55:34.9997268Z at
> org.junit.runners.Suite.runChild(Suite.java:128)
> 2020-10-01T21:55:34.9997695Z at
> org.junit.runners.Suite.runChild(Suite.java:27)
> 2020-10-01T21:55:34.9998077Z at
> org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
> 2020-10-01T21:55:34.9998510Z at
> org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
> 2020-10-01T21:55:34.9998941Z at
> org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
> 2020-10-01T21:55:34.9999380Z at
> org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
> 2020-10-01T21:55:34.9999815Z at
> org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
> 2020-10-01T21:55:35.0000226Z at
> org.junit.runners.ParentRunner.run(ParentRunner.java:363)
> 2020-10-01T21:55:35.0000662Z at
> org.apache.maven.surefire.junitcore.JUnitCore.run(JUnitCore.java:55)
> 2020-10-01T21:55:35.0001190Z at
> org.apache.maven.surefire.junitcore.JUnitCoreWrapper.createRequestAndRun(JUnitCoreWrapper.java:137)
> 2020-10-01T21:55:35.0001746Z at
> org.apache.maven.surefire.junitcore.JUnitCoreWrapper.executeLazy(JUnitCoreWrapper.java:119)
> 2020-10-01T21:55:35.0002432Z at
> org.apache.maven.surefire.junitcore.JUnitCoreWrapper.execute(JUnitCoreWrapper.java:87)
> 2020-10-01T21:55:35.0002974Z at
> org.apache.maven.surefire.junitcore.JUnitCoreWrapper.execute(JUnitCoreWrapper.java:75)
> 2020-10-01T21:55:35.0003797Z at
> org.apache.maven.surefire.junitcore.JUnitCoreProvider.invoke(JUnitCoreProvider.java:158)
> 2020-10-01T21:55:35.0004349Z at
> org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:384)
> 2020-10-01T21:55:35.0004913Z at
> org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:345)
> 2020-10-01T21:55:35.0005427Z at
> org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:126)
> 2020-10-01T21:55:35.0005900Z at
> org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:418)
> 2020-10-01T21:55:35.0006196Z
> 2020-10-01T21:55:35.0006585Z "Reference Handler" #2 daemon prio=10 os_prio=0
> cpu=0.79ms elapsed=921.95s tid=0x00007f8c0027e800 nid=0xf7b waiting on
> condition [0x00007f8bd0af1000]
> 2020-10-01T21:55:35.0007132Z java.lang.Thread.State: RUNNABLE
> 2020-10-01T21:55:35.0007513Z at
> java.lang.ref.Reference.waitForReferencePendingList(java.base@11.0.7/Native
> Method)
> 2020-10-01T21:55:35.0008018Z at
> java.lang.ref.Reference.processPendingReferences(java.base@11.0.7/Reference.java:241)
> 2020-10-01T21:55:35.0008484Z at
> java.lang.ref.Reference$ReferenceHandler.run(java.base@11.0.7/Reference.java:213)
> 2020-10-01T21:55:35.0008769Z
> 2020-10-01T21:55:35.0009134Z "Finalizer" #3 daemon prio=8 os_prio=0
> cpu=0.48ms elapsed=921.95s tid=0x00007f8c00283000 nid=0xf7d in Object.wait()
> [0x00007f8bd09f0000]
> 2020-10-01T21:55:35.0009630Z java.lang.Thread.State: WAITING (on object
> monitor)
> 2020-10-01T21:55:35.0009980Z at
> java.lang.Object.wait(java.base@11.0.7/Native Method)
> 2020-10-01T21:55:35.0010612Z - waiting on <0x000000008e704170> (a
> java.lang.ref.ReferenceQueue$Lock)
> 2020-10-01T21:55:35.0011047Z at
> java.lang.ref.ReferenceQueue.remove(java.base@11.0.7/ReferenceQueue.java:155)
> 2020-10-01T21:55:35.0011672Z - waiting to re-lock in wait()
> <0x000000008e704170> (a java.lang.ref.ReferenceQueue$Lock)
> 2020-10-01T21:55:35.0012130Z at
> java.lang.ref.ReferenceQueue.remove(java.base@11.0.7/ReferenceQueue.java:176)
> 2020-10-01T21:55:35.0012672Z at
> java.lang.ref.Finalizer$FinalizerThread.run(java.base@11.0.7/Finalizer.java:170)
> 2020-10-01T21:55:35.0012943Z
> 2020-10-01T21:55:35.0013322Z "Signal Dispatcher" #4 daemon prio=9 os_prio=0
> cpu=0.52ms elapsed=921.94s tid=0x00007f8c00297800 nid=0xf7f runnable
> [0x0000000000000000]
> 2020-10-01T21:55:35.0013773Z java.lang.Thread.State: RUNNABLE
> 2020-10-01T21:55:35.0013975Z
> 2020-10-01T21:55:35.0014366Z "C2 CompilerThread0" #5 daemon prio=9 os_prio=0
> cpu=641.40ms elapsed=921.94s tid=0x00007f8c00299800 nid=0xf80 waiting on
> condition [0x0000000000000000]
> 2020-10-01T21:55:35.0014854Z java.lang.Thread.State: RUNNABLE
> 2020-10-01T21:55:35.0015120Z No compile task
> 2020-10-01T21:55:35.0015267Z
> 2020-10-01T21:55:35.0015674Z "C1 CompilerThread0" #15 daemon prio=9 os_prio=0
> cpu=491.81ms elapsed=921.94s tid=0x00007f8c0029c000 nid=0xf81 waiting on
> condition [0x0000000000000000]
> 2020-10-01T21:55:35.0016145Z java.lang.Thread.State: RUNNABLE
> 2020-10-01T21:55:35.0016409Z No compile task
> 2020-10-01T21:55:35.0016558Z
> 2020-10-01T21:55:35.0016934Z "Sweeper thread" #20 daemon prio=9 os_prio=0
> cpu=53.17ms elapsed=921.94s tid=0x00007f8c0029e000 nid=0xf82 runnable
> [0x0000000000000000]
> 2020-10-01T21:55:35.0017450Z java.lang.Thread.State: RUNNABLE
> 2020-10-01T21:55:35.0017688Z
> 2020-10-01T21:55:35.0018064Z "Service Thread" #21 daemon prio=9 os_prio=0
> cpu=0.20ms elapsed=921.90s tid=0x00007f8c00321800 nid=0xf8a runnable
> [0x0000000000000000]
> 2020-10-01T21:55:35.0018510Z java.lang.Thread.State: RUNNABLE
> 2020-10-01T21:55:35.0018710Z
> 2020-10-01T21:55:35.0019343Z "Common-Cleaner" #22 daemon prio=8 os_prio=0
> cpu=2.51ms elapsed=921.89s tid=0x00007f8c0032d000 nid=0xf90 in Object.wait()
> [0x00007f8ba3ffe000]
> 2020-10-01T21:55:35.0019861Z java.lang.Thread.State: TIMED_WAITING (on
> object monitor)
> 2020-10-01T21:55:35.0020238Z at
> java.lang.Object.wait(java.base@11.0.7/Native Method)
> 2020-10-01T21:55:35.0020701Z - waiting on <no object reference available>
> 2020-10-01T21:55:35.0021178Z at
> java.lang.ref.ReferenceQueue.remove(java.base@11.0.7/ReferenceQueue.java:155)
> 2020-10-01T21:55:35.0021880Z - waiting to re-lock in wait()
> <0x000000008e705d98> (a java.lang.ref.ReferenceQueue$Lock)
> 2020-10-01T21:55:35.0022450Z at
> jdk.internal.ref.CleanerImpl.run(java.base@11.0.7/CleanerImpl.java:148)
> 2020-10-01T21:55:35.0022860Z at
> java.lang.Thread.run(java.base@11.0.7/Thread.java:834)
> 2020-10-01T21:55:35.0023273Z at
> jdk.internal.misc.InnocuousThread.run(java.base@11.0.7/InnocuousThread.java:134)
> 2020-10-01T21:55:35.0023544Z
> 2020-10-01T21:55:35.0024207Z "surefire-forkedjvm-command-thread" #23 daemon
> prio=5 os_prio=0 cpu=14.02ms elapsed=921.83s tid=0x00007f8c003de000 nid=0xf92
> runnable [0x00007f8ba3ad5000]
> 2020-10-01T21:55:35.0024689Z java.lang.Thread.State: RUNNABLE
> 2020-10-01T21:55:35.0025037Z at
> java.io.FileInputStream.readBytes(java.base@11.0.7/Native Method)
> 2020-10-01T21:55:35.0025453Z at
> java.io.FileInputStream.read(java.base@11.0.7/FileInputStream.java:279)
> 2020-10-01T21:55:35.0025895Z at
> java.io.BufferedInputStream.fill(java.base@11.0.7/BufferedInputStream.java:252)
> 2020-10-01T21:55:35.0026359Z at
> java.io.BufferedInputStream.read(java.base@11.0.7/BufferedInputStream.java:271)
> 2020-10-01T21:55:35.0026942Z - locked <0x000000008e707330> (a
> java.io.BufferedInputStream)
> 2020-10-01T21:55:35.0027426Z at
> java.io.DataInputStream.readInt(java.base@11.0.7/DataInputStream.java:392)
> 2020-10-01T21:55:35.0027979Z at
> org.apache.maven.surefire.booter.MasterProcessCommand.decode(MasterProcessCommand.java:115)
> 2020-10-01T21:55:35.0028623Z at
> org.apache.maven.surefire.booter.CommandReader$CommandRunnable.run(CommandReader.java:391)
> 2020-10-01T21:55:35.0029053Z at
> java.lang.Thread.run(java.base@11.0.7/Thread.java:834)
> 2020-10-01T21:55:35.0029280Z
> 2020-10-01T21:55:35.0029927Z "surefire-forkedjvm-ping-30s" #24 daemon prio=5
> os_prio=0 cpu=847.16ms elapsed=921.75s tid=0x00007f8c00473800 nid=0xf93
> waiting on condition [0x00007f8ba35c8000]
> 2020-10-01T21:55:35.0030448Z java.lang.Thread.State: TIMED_WAITING
> (parking)
> 2020-10-01T21:55:35.0030804Z at
> jdk.internal.misc.Unsafe.park(java.base@11.0.7/Native Method)
> 2020-10-01T21:55:35.0031430Z - parking to wait for <0x000000008e702fe0> (a
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
> 2020-10-01T21:55:35.0031930Z at
> java.util.concurrent.locks.LockSupport.parkNanos(java.base@11.0.7/LockSupport.java:234)
> 2020-10-01T21:55:35.0032543Z at
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(java.base@11.0.7/AbstractQueuedSynchronizer.java:2123)
> 2020-10-01T21:55:35.0033139Z at
> java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base@11.0.7/ScheduledThreadPoolExecutor.java:1182)
> 2020-10-01T21:55:35.0033730Z at
> java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base@11.0.7/ScheduledThreadPoolExecutor.java:899)
> 2020-10-01T21:55:35.0034270Z at
> java.util.concurrent.ThreadPoolExecutor.getTask(java.base@11.0.7/ThreadPoolExecutor.java:1054)
> 2020-10-01T21:55:35.0034751Z at
> java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@11.0.7/ThreadPoolExecutor.java:1114)
> 2020-10-01T21:55:35.0035246Z at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@11.0.7/ThreadPoolExecutor.java:628)
> 2020-10-01T21:55:35.0035671Z at
> java.lang.Thread.run(java.base@11.0.7/Thread.java:834)
> 2020-10-01T21:55:35.0035882Z
> 2020-10-01T21:55:35.0036266Z "process reaper" #25 daemon prio=10 os_prio=0
> cpu=278.14ms elapsed=921.73s tid=0x00007f8b94016000 nid=0xf97 waiting on
> condition [0x00007f8c064d5000]
> 2020-10-01T21:55:35.0036747Z java.lang.Thread.State: TIMED_WAITING
> (parking)
> 2020-10-01T21:55:35.0037150Z at
> jdk.internal.misc.Unsafe.park(java.base@11.0.7/Native Method)
> 2020-10-01T21:55:35.0037822Z - parking to wait for <0x000000008e704488> (a
> java.util.concurrent.SynchronousQueue$TransferStack)
> 2020-10-01T21:55:35.0038282Z at
> java.util.concurrent.locks.LockSupport.parkNanos(java.base@11.0.7/LockSupport.java:234)
> 2020-10-01T21:55:35.0038782Z at
> java.util.concurrent.SynchronousQueue$TransferStack.awaitFulfill(java.base@11.0.7/SynchronousQueue.java:462)
> 2020-10-01T21:55:35.0039467Z at
> java.util.concurrent.SynchronousQueue$TransferStack.transfer(java.base@11.0.7/SynchronousQueue.java:361)
> 2020-10-01T21:55:35.0039943Z at
> java.util.concurrent.SynchronousQueue.poll(java.base@11.0.7/SynchronousQueue.java:937)
> 2020-10-01T21:55:35.0040413Z at
> java.util.concurrent.ThreadPoolExecutor.getTask(java.base@11.0.7/ThreadPoolExecutor.java:1053)
> 2020-10-01T21:55:35.0040907Z at
> java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@11.0.7/ThreadPoolExecutor.java:1114)
> 2020-10-01T21:55:35.0041393Z at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@11.0.7/ThreadPoolExecutor.java:628)
> 2020-10-01T21:55:35.0041803Z at
> java.lang.Thread.run(java.base@11.0.7/Thread.java:834)
> 2020-10-01T21:55:35.0042026Z
> 2020-10-01T21:55:35.0042516Z "Queue Drainer" #28 prio=10 os_prio=0 cpu=0.95ms
> elapsed=920.78s tid=0x00007f8c009d6800 nid=0xfb7 waiting on condition
> [0x00007f8ba22bd000]
> 2020-10-01T21:55:35.0042993Z java.lang.Thread.State: WAITING (parking)
> 2020-10-01T21:55:35.0043338Z at
> jdk.internal.misc.Unsafe.park(java.base@11.0.7/Native Method)
> 2020-10-01T21:55:35.0043949Z - parking to wait for <0x000000008df00fa8> (a
> java.util.concurrent.CompletableFuture$Signaller)
> 2020-10-01T21:55:35.0044408Z at
> java.util.concurrent.locks.LockSupport.park(java.base@11.0.7/LockSupport.java:194)
> 2020-10-01T21:55:35.0044887Z at
> java.util.concurrent.CompletableFuture$Signaller.block(java.base@11.0.7/CompletableFuture.java:1796)
> 2020-10-01T21:55:35.0045357Z at
> java.util.concurrent.ForkJoinPool.managedBlock(java.base@11.0.7/ForkJoinPool.java:3128)
> 2020-10-01T21:55:35.0045830Z at
> java.util.concurrent.CompletableFuture.waitingGet(java.base@11.0.7/CompletableFuture.java:1823)
> 2020-10-01T21:55:35.0046742Z at
> java.util.concurrent.CompletableFuture.get(java.base@11.0.7/CompletableFuture.java:1998)
> 2020-10-01T21:55:35.0047375Z at
> org.apache.flink.connector.base.source.reader.synchronization.FutureCompletingBlockingQueue.take(FutureCompletingBlockingQueue.java:235)
> 2020-10-01T21:55:35.0048103Z at
> org.apache.flink.connector.base.source.reader.fetcher.SplitFetcherTest$QueueDrainerThread.go(SplitFetcherTest.java:289)
> 2020-10-01T21:55:35.0048659Z at
> org.apache.flink.core.testutils.CheckedThread.run(CheckedThread.java:74)
> 2020-10-01T21:55:35.0048929Z
> 2020-10-01T21:55:35.0049311Z "Attach Listener" #29 daemon prio=9 os_prio=0
> cpu=0.39ms elapsed=0.10s tid=0x00007f8bb4001000 nid=0x1922 waiting on
> condition [0x0000000000000000]
> 2020-10-01T21:55:35.0049756Z java.lang.Thread.State: RUNNABLE
> 2020-10-01T21:55:35.0049952Z
> 2020-10-01T21:55:35.0050238Z "VM Thread" os_prio=0 cpu=128.10ms
> elapsed=921.96s tid=0x00007f8c00276800 nid=0xf7a runnable
> 2020-10-01T21:55:35.0050517Z
> 2020-10-01T21:55:35.0050805Z "GC Thread#0" os_prio=0 cpu=31.75ms
> elapsed=921.98s tid=0x00007f8c00041000 nid=0xf72 runnable
> 2020-10-01T21:55:35.0051086Z
> 2020-10-01T21:55:35.0051375Z "GC Thread#1" os_prio=0 cpu=27.13ms
> elapsed=921.35s tid=0x00007f8bc8001000 nid=0xfaa runnable
> 2020-10-01T21:55:35.0051656Z
> 2020-10-01T21:55:35.0051947Z "GC Thread#2" os_prio=0 cpu=28.21ms
> elapsed=921.35s tid=0x00007f8bc8002800 nid=0xfab runnable
> 2020-10-01T21:55:35.0052230Z
> 2020-10-01T21:55:35.0052594Z "GC Thread#3" os_prio=0 cpu=29.39ms
> elapsed=921.35s tid=0x00007f8bc8004000 nid=0xfac runnable
> 2020-10-01T21:55:35.0052871Z
> 2020-10-01T21:55:35.0053157Z "GC Thread#4" os_prio=0 cpu=27.78ms
> elapsed=921.35s tid=0x00007f8bc8005800 nid=0xfad runnable
> 2020-10-01T21:55:35.0053437Z
> 2020-10-01T21:55:35.0053722Z "GC Thread#5" os_prio=0 cpu=28.21ms
> elapsed=921.35s tid=0x00007f8bc8007000 nid=0xfae runnable
> 2020-10-01T21:55:35.0054000Z
> 2020-10-01T21:55:35.0054290Z "G1 Main Marker" os_prio=0 cpu=0.88ms
> elapsed=921.98s tid=0x00007f8c00074800 nid=0xf73 runnable
> 2020-10-01T21:55:35.0054572Z
> 2020-10-01T21:55:35.0054851Z "G1 Conc#0" os_prio=0 cpu=0.10ms elapsed=921.98s
> tid=0x00007f8c00076800 nid=0xf74 runnable
> 2020-10-01T21:55:35.0055127Z
> 2020-10-01T21:55:35.0055518Z "G1 Refine#0" os_prio=0 cpu=0.83ms
> elapsed=921.98s tid=0x00007f8c001aa800 nid=0xf77 runnable
> 2020-10-01T21:55:35.0055852Z
> 2020-10-01T21:55:35.0056161Z "G1 Young RemSet Sampling" os_prio=0
> cpu=257.38ms elapsed=921.98s tid=0x00007f8c001ac800 nid=0xf78 runnable
> 2020-10-01T21:55:35.0056683Z "VM Periodic Task Thread" os_prio=0 cpu=657.91ms
> elapsed=921.90s tid=0x00007f8c00324000 nid=0xf8b waiting on condition
> 2020-10-01T21:55:35.0056992Z
> 2020-10-01T21:55:35.0057263Z JNI global refs: 29, weak refs: 0
> {code}
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