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Posted to dev@kafka.apache.org by "Jun Rao (JIRA)" <ji...@apache.org> on 2014/05/20 19:46:41 UTC
[jira] [Commented] (KAFKA-1458) kafka hanging on shutdown
[ https://issues.apache.org/jira/browse/KAFKA-1458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14003725#comment-14003725 ]
Jun Rao commented on KAFKA-1458:
--------------------------------
Could you try 0.8.1.1, which fixed some deadlock issues during shutdown?
> kafka hanging on shutdown
> -------------------------
>
> Key: KAFKA-1458
> URL: https://issues.apache.org/jira/browse/KAFKA-1458
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 0.8.1
> Reporter: James Blackburn
>
> I tried to restart the kafka broker because of KAFKA-1407. However a normal kill wouldn't kill it:
> jstack shows:
> {code}
> Full thread dump Java HotSpot(TM) 64-Bit Server VM (24.0-b56 mixed mode):
> "Attach Listener" daemon prio=10 tid=0x000000001c2e8800 nid=0x6174 waiting on condition [0x0000000000000000]
> java.lang.Thread.State: RUNNABLE
> "SIGTERM handler" daemon prio=10 tid=0x000000001c377800 nid=0x6076 waiting for monitor entry [0x00000000431f2000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at java.lang.Shutdown.exit(Shutdown.java:212)
> - waiting to lock <0x00000000d042f068> (a java.lang.Class for java.lang.Shutdown)
> at java.lang.Terminator$1.handle(Terminator.java:52)
> at sun.misc.Signal$1.run(Signal.java:212)
> at java.lang.Thread.run(Thread.java:724)
> "SIGTERM handler" daemon prio=10 tid=0x000000001c652800 nid=0x6069 waiting for monitor entry [0x00000000430f1000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at java.lang.Shutdown.exit(Shutdown.java:212)
> - waiting to lock <0x00000000d042f068> (a java.lang.Class for java.lang.Shutdown)
> at java.lang.Terminator$1.handle(Terminator.java:52)
> at sun.misc.Signal$1.run(Signal.java:212)
> at java.lang.Thread.run(Thread.java:724)
> "SIGTERM handler" daemon prio=10 tid=0x000000001c204000 nid=0x6068 waiting for monitor entry [0x0000000044303000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at java.lang.Shutdown.exit(Shutdown.java:212)
> - waiting to lock <0x00000000d042f068> (a java.lang.Class for java.lang.Shutdown)
> at java.lang.Terminator$1.handle(Terminator.java:52)
> at sun.misc.Signal$1.run(Signal.java:212)
> at java.lang.Thread.run(Thread.java:724)
> "SIGTERM handler" daemon prio=10 tid=0x000000001c319000 nid=0x605b waiting for monitor entry [0x00000000409f3000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at java.lang.Shutdown.exit(Shutdown.java:212)
> - waiting to lock <0x00000000d042f068> (a java.lang.Class for java.lang.Shutdown)
> at java.lang.Terminator$1.handle(Terminator.java:52)
> at sun.misc.Signal$1.run(Signal.java:212)
> at java.lang.Thread.run(Thread.java:724)
> "SIGTERM handler" daemon prio=10 tid=0x000000001c625000 nid=0x604c waiting for monitor entry [0x00000000439fa000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at java.lang.Shutdown.exit(Shutdown.java:212)
> - waiting to lock <0x00000000d042f068> (a java.lang.Class for java.lang.Shutdown)
> at java.lang.Terminator$1.handle(Terminator.java:52)
> at sun.misc.Signal$1.run(Signal.java:212)
> at java.lang.Thread.run(Thread.java:724)
> "SIGTERM handler" daemon prio=10 tid=0x000000001c2e9800 nid=0x5d8b waiting for monitor entry [0x00000000438f9000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at java.lang.Shutdown.exit(Shutdown.java:212)
> - waiting to lock <0x00000000d042f068> (a java.lang.Class for java.lang.Shutdown)
> at java.lang.Terminator$1.handle(Terminator.java:52)
> at sun.misc.Signal$1.run(Signal.java:212)
> at java.lang.Thread.run(Thread.java:724)
> "Thread-2" prio=10 tid=0x000000001c31a000 nid=0x3d4f waiting on condition [0x0000000044707000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000000d04f28b8> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:867)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1197)
> at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:214)
> at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:290)
> at kafka.utils.Utils$.inLock(Utils.scala:536)
> at kafka.controller.KafkaController.shutdown(KafkaController.scala:641)
> at kafka.server.KafkaServer$$anonfun$shutdown$8.apply$mcV$sp(KafkaServer.scala:233)
> at kafka.utils.Utils$.swallow(Utils.scala:167)
> at kafka.utils.Logging$class.swallowWarn(Logging.scala:92)
> at kafka.utils.Utils$.swallowWarn(Utils.scala:46)
> at kafka.utils.Logging$class.swallow(Logging.scala:94)
> at kafka.utils.Utils$.swallow(Utils.scala:46)
> at kafka.server.KafkaServer.shutdown(KafkaServer.scala:233)
> at kafka.server.KafkaServerStartable.shutdown(KafkaServerStartable.scala:46)
> at kafka.Kafka$$anon$1.run(Kafka.scala:42)
> "SIGTERM handler" daemon prio=10 tid=0x000000001c5ac800 nid=0x3d4d in Object.wait() [0x0000000040d5a000]
> java.lang.Thread.State: WAITING (on object monitor)
> at java.lang.Object.wait(Native Method)
> at java.lang.Thread.join(Thread.java:1260)
> - locked <0x00000000d0410f90> (a kafka.Kafka$$anon$1)
> at java.lang.Thread.join(Thread.java:1334)
> at java.lang.ApplicationShutdownHooks.runHooks(ApplicationShutdownHooks.java:106)
> at java.lang.ApplicationShutdownHooks$1.run(ApplicationShutdownHooks.java:46)
> at java.lang.Shutdown.runHooks(Shutdown.java:123)
> at java.lang.Shutdown.sequence(Shutdown.java:167)
> at java.lang.Shutdown.exit(Shutdown.java:212)
> - locked <0x00000000d042f068> (a java.lang.Class for java.lang.Shutdown)
> at java.lang.Terminator$1.handle(Terminator.java:52)
> at sun.misc.Signal$1.run(Signal.java:212)
> at java.lang.Thread.run(Thread.java:724)
> "main-EventThread" daemon prio=10 tid=0x000000001c939800 nid=0x3504 waiting on condition [0x0000000044606000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000000d69e0f48> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
> at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
> at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:503)
> "main-SendThread(reggie-svc-257:2181)" daemon prio=10 tid=0x000000001c5ca000 nid=0x3503 runnable [0x0000000041030000]
> java.lang.Thread.State: RUNNABLE
> at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
> at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:257)
> at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
> at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
> - locked <0x00000000fa134dc0> (a sun.nio.ch.Util$2)
> - locked <0x00000000fa134dd8> (a java.util.Collections$UnmodifiableSet)
> - locked <0x00000000e2348030> (a sun.nio.ch.EPollSelectorImpl)
> at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
> at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1134)
> "Controller-1-to-broker-0-send-thread" prio=10 tid=0x00002aaab0731800 nid=0x4535 waiting on condition [0x000000004031f000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000000d13d3878> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
> at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
> at kafka.controller.RequestSendThread.doWork(ControllerChannelManager.scala:121)
> at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:51)
> "delete-topics-thread" prio=10 tid=0x00002aaab10f8800 nid=0x4e2a waiting on condition [0x0000000044505000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000000d04f28b8> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:867)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2047)
> at kafka.controller.TopicDeletionManager.kafka$controller$TopicDeletionManager$$awaitTopicDeletionNotification(TopicDeletionManager.scala:178)
> at kafka.controller.TopicDeletionManager$DeleteTopicsThread$$anonfun$doWork$1.apply$mcV$sp(TopicDeletionManager.scala:334)
> at kafka.controller.TopicDeletionManager$DeleteTopicsThread$$anonfun$doWork$1.apply(TopicDeletionManager.scala:333)
> at kafka.controller.TopicDeletionManager$DeleteTopicsThread$$anonfun$doWork$1.apply(TopicDeletionManager.scala:333)
> at kafka.utils.Utils$.inLock(Utils.scala:538)
> at kafka.controller.TopicDeletionManager$DeleteTopicsThread.doWork(TopicDeletionManager.scala:333)
> at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:51)
> "Controller-1-to-broker-1-send-thread" prio=10 tid=0x000000001c714800 nid=0x4e1d waiting on condition [0x0000000044404000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000000d06f96f8> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
> at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
> at kafka.controller.RequestSendThread.doWork(ControllerChannelManager.scala:121)
> at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:51)
> "metrics-meter-tick-thread-2" daemon prio=10 tid=0x000000001c600000 nid=0x2add waiting on condition [0x00000000437f8000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000000d0363bf0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
> at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1085)
> at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:807)
> at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1068)
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:724)
> "metrics-meter-tick-thread-1" daemon prio=10 tid=0x000000001c5ce000 nid=0x2adb waiting on condition [0x00000000436f7000]
> java.lang.Thread.State: TIMED_WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000000d0363bf0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
> at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:226)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2082)
> at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1090)
> at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:807)
> at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1068)
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:724)
> "ZkClient-EventThread-13-reggie-svc-257:2181,reggie-svc-258:2181" daemon prio=10 tid=0x00002aaab04e1800 nid=0x2a2b waiting on condition [0x0000000040c59000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000000d03658e8> (a java.util.concurrent.CountDownLatch$Sync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:994)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1303)
> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:236)
> at kafka.utils.ShutdownableThread.shutdown(ShutdownableThread.scala:36)
> at kafka.controller.TopicDeletionManager.shutdown(TopicDeletionManager.scala:93)
> at kafka.controller.KafkaController$$anonfun$onControllerResignation$1.apply$mcV$sp(KafkaController.scala:340)
> at kafka.controller.KafkaController$$anonfun$onControllerResignation$1.apply(KafkaController.scala:337)
> at kafka.controller.KafkaController$$anonfun$onControllerResignation$1.apply(KafkaController.scala:337)
> at kafka.utils.Utils$.inLock(Utils.scala:538)
> at kafka.controller.KafkaController.onControllerResignation(KafkaController.scala:337)
> at kafka.controller.KafkaController$SessionExpirationListener$$anonfun$handleNewSession$1.apply$mcZ$sp(KafkaController.scala:1068)
> at kafka.controller.KafkaController$SessionExpirationListener$$anonfun$handleNewSession$1.apply(KafkaController.scala:1067)
> at kafka.controller.KafkaController$SessionExpirationListener$$anonfun$handleNewSession$1.apply(KafkaController.scala:1067)
> at kafka.utils.Utils$.inLock(Utils.scala:538)
> at kafka.controller.KafkaController$SessionExpirationListener.handleNewSession(KafkaController.scala:1067)
> at org.I0Itec.zkclient.ZkClient$4.run(ZkClient.java:472)
> at org.I0Itec.zkclient.ZkEventThread.run(ZkEventThread.java:71)
> "RMI TCP Accept-0" daemon prio=10 tid=0x00002aaab0316800 nid=0x298f runnable [0x0000000040731000]
> java.lang.Thread.State: RUNNABLE
> at java.net.PlainSocketImpl.socketAccept(Native Method)
> at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:398)
> at java.net.ServerSocket.implAccept(ServerSocket.java:530)
> at java.net.ServerSocket.accept(ServerSocket.java:498)
> at sun.management.jmxremote.LocalRMIServerSocketFactory$1.accept(LocalRMIServerSocketFactory.java:52)
> at sun.rmi.transport.tcp.TCPTransport$AcceptLoop.executeAcceptLoop(TCPTransport.java:388)
> at sun.rmi.transport.tcp.TCPTransport$AcceptLoop.run(TCPTransport.java:360)
> at java.lang.Thread.run(Thread.java:724)
> "Service Thread" daemon prio=10 tid=0x00002aaab0242000 nid=0x2979 runnable [0x0000000000000000]
> java.lang.Thread.State: RUNNABLE
> "C2 CompilerThread1" daemon prio=10 tid=0x00002aaab023f800 nid=0x2978 waiting on condition [0x0000000000000000]
> java.lang.Thread.State: RUNNABLE
> "C2 CompilerThread0" daemon prio=10 tid=0x00002aaab023d800 nid=0x2977 waiting on condition [0x0000000000000000]
> java.lang.Thread.State: RUNNABLE
> "Signal Dispatcher" daemon prio=10 tid=0x00002aaab023b000 nid=0x2976 runnable [0x0000000000000000]
> java.lang.Thread.State: RUNNABLE
> "Surrogate Locker Thread (Concurrent GC)" daemon prio=10 tid=0x00002aaab0239000 nid=0x2974 waiting on condition [0x0000000000000000]
> java.lang.Thread.State: RUNNABLE
> "Finalizer" daemon prio=10 tid=0x00002aaab021b000 nid=0x296e in Object.wait() [0x0000000041a6d000]
> java.lang.Thread.State: WAITING (on object monitor)
> at java.lang.Object.wait(Native Method)
> at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:135)
> - locked <0x00000000d0351828> (a java.lang.ref.ReferenceQueue$Lock)
> at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:151)
> at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:189)
> "Reference Handler" daemon prio=10 tid=0x00002aaab0217000 nid=0x296d in Object.wait() [0x0000000040b58000]
> java.lang.Thread.State: WAITING (on object monitor)
> at java.lang.Object.wait(Native Method)
> at java.lang.Object.wait(Object.java:503)
> at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:133)
> - locked <0x00000000d0356c10> (a java.lang.ref.Reference$Lock)
> "main" prio=10 tid=0x000000001c152800 nid=0x2945 waiting on condition [0x000000004021e000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000000d0355760> (a java.util.concurrent.CountDownLatch$Sync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:994)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1303)
> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:236)
> at kafka.server.KafkaServer.awaitShutdown(KafkaServer.scala:246)
> at kafka.server.KafkaServerStartable.awaitShutdown(KafkaServerStartable.scala:56)
> at kafka.Kafka$.main(Kafka.scala:47)
> at kafka.Kafka.main(Kafka.scala)
> "VM Thread" prio=10 tid=0x00002aaab0214800 nid=0x296b runnable
> "Gang worker#0 (Parallel GC Threads)" prio=10 tid=0x000000001c164000 nid=0x2946 runnable
> "Gang worker#1 (Parallel GC Threads)" prio=10 tid=0x000000001c165800 nid=0x2947 runnable
> "Gang worker#2 (Parallel GC Threads)" prio=10 tid=0x00002aaab0001000 nid=0x2949 runnable
> "Gang worker#3 (Parallel GC Threads)" prio=10 tid=0x00002aaab0003000 nid=0x294b runnable
> "Gang worker#4 (Parallel GC Threads)" prio=10 tid=0x00002aaab0004800 nid=0x294c runnable
> "Gang worker#5 (Parallel GC Threads)" prio=10 tid=0x00002aaab0006800 nid=0x294e runnable
> "Gang worker#6 (Parallel GC Threads)" prio=10 tid=0x00002aaab0008800 nid=0x294f runnable
> "Gang worker#7 (Parallel GC Threads)" prio=10 tid=0x00002aaab000a000 nid=0x2950 runnable
> "Gang worker#8 (Parallel GC Threads)" prio=10 tid=0x00002aaab000c000 nid=0x2952 runnable
> "Gang worker#9 (Parallel GC Threads)" prio=10 tid=0x00002aaab000e000 nid=0x2954 runnable
> "Gang worker#10 (Parallel GC Threads)" prio=10 tid=0x00002aaab0010000 nid=0x2955 runnable
> "Gang worker#11 (Parallel GC Threads)" prio=10 tid=0x00002aaab0011800 nid=0x2956 runnable
> "Gang worker#12 (Parallel GC Threads)" prio=10 tid=0x00002aaab0013800 nid=0x2957 runnable
> "Gang worker#13 (Parallel GC Threads)" prio=10 tid=0x00002aaab0015800 nid=0x2959 runnable
> "Gang worker#14 (Parallel GC Threads)" prio=10 tid=0x00002aaab0017000 nid=0x295b runnable
> "Gang worker#15 (Parallel GC Threads)" prio=10 tid=0x00002aaab0019000 nid=0x295d runnable
> "Gang worker#16 (Parallel GC Threads)" prio=10 tid=0x00002aaab001b000 nid=0x295e runnable
> "Gang worker#17 (Parallel GC Threads)" prio=10 tid=0x00002aaab001d000 nid=0x2961 runnable
> "Concurrent Mark-Sweep GC Thread" prio=10 tid=0x00002aaab01d0000 nid=0x296a runnable
> "Gang worker#0 (Parallel CMS Threads)" prio=10 tid=0x00002aaab01c6000 nid=0x2962 runnable
> "Gang worker#1 (Parallel CMS Threads)" prio=10 tid=0x00002aaab01c8000 nid=0x2963 runnable
> "Gang worker#2 (Parallel CMS Threads)" prio=10 tid=0x00002aaab01c9800 nid=0x2964 runnable
> "Gang worker#3 (Parallel CMS Threads)" prio=10 tid=0x00002aaab01cb800 nid=0x2967 runnable
> "Gang worker#4 (Parallel CMS Threads)" prio=10 tid=0x00002aaab01cd800 nid=0x2968 runnable
> "VM Periodic Task Thread" prio=10 tid=0x00002aaab0326800 nid=0x2997 waiting on condition
> JNI global references: 162
> {code}
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