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From jamborta <jambo...@gmail.com>
Subject Spark 2.0.0 job completes but hangs
Date Mon, 10 Oct 2016 15:26:13 GMT
Hi all,

I have a spark job that takes about an hour to run, in the end it completes
all the task, then the job just hangs and does nothing (it writes to s3 as
the last step, which also gets completed, all files appear on s3).

any ideas how to debug this? 

see the thread dump below: 

"Attach Listener" daemon prio=10 tid=0x00007f67a8001000 nid=0x7b90 waiting
on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"SparkUI-224" daemon prio=10 tid=0x00007f6778001000 nid=0x7b4a waiting on
condition [0x00007f67c2cfa000]
   java.lang.Thread.State: TIMED_WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c77cc010> (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
org.spark_project.jetty.util.BlockingArrayQueue.poll(BlockingArrayQueue.java:389)
	at
org.spark_project.jetty.util.thread.QueuedThreadPool.idleJobPoll(QueuedThreadPool.java:531)
	at
org.spark_project.jetty.util.thread.QueuedThreadPool.access$700(QueuedThreadPool.java:47)
	at
org.spark_project.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:590)
	at java.lang.Thread.run(Thread.java:745)

"SparkUI-223" daemon prio=10 tid=0x00007f671008e000 nid=0x7b49 waiting on
condition [0x00007f67d1b4d000]
   java.lang.Thread.State: TIMED_WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c77cc010> (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
org.spark_project.jetty.util.BlockingArrayQueue.poll(BlockingArrayQueue.java:389)
	at
org.spark_project.jetty.util.thread.QueuedThreadPool.idleJobPoll(QueuedThreadPool.java:531)
	at
org.spark_project.jetty.util.thread.QueuedThreadPool.access$700(QueuedThreadPool.java:47)
	at
org.spark_project.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:590)
	at java.lang.Thread.run(Thread.java:745)

"SparkUI-222" daemon prio=10 tid=0x00007f677c006800 nid=0x7b48 waiting on
condition [0x00007f67c8e33000]
   java.lang.Thread.State: TIMED_WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c77cc010> (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
org.spark_project.jetty.util.BlockingArrayQueue.poll(BlockingArrayQueue.java:389)
	at
org.spark_project.jetty.util.thread.QueuedThreadPool.idleJobPoll(QueuedThreadPool.java:531)
	at
org.spark_project.jetty.util.thread.QueuedThreadPool.access$700(QueuedThreadPool.java:47)
	at
org.spark_project.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:590)
	at java.lang.Thread.run(Thread.java:745)

"DestroyJavaVM" prio=10 tid=0x00007f67ed157000 nid=0x23c9 waiting on
condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"SparkUI-205" daemon prio=10 tid=0x00007f6718002000 nid=0x7aa0 waiting on
condition [0x00007f67b82ee000]
   java.lang.Thread.State: TIMED_WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c77cc010> (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
org.spark_project.jetty.util.BlockingArrayQueue.poll(BlockingArrayQueue.java:389)
	at
org.spark_project.jetty.util.thread.QueuedThreadPool.idleJobPoll(QueuedThreadPool.java:531)
	at
org.spark_project.jetty.util.thread.QueuedThreadPool.access$700(QueuedThreadPool.java:47)
	at
org.spark_project.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:590)
	at java.lang.Thread.run(Thread.java:745)

"Scheduler-916842649" prio=10 tid=0x00007f672c004000 nid=0x7a9e waiting on
condition [0x00007f67b89f5000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c78ee520> (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$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1079)
	at
java.util.concurrent.ScheduledThreadPoolExecutor$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:745)

"shuffle-server-7" daemon prio=10 tid=0x00007f66e4007800 nid=0x61cf runnable
[0x00007f67c8429000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
	- locked <0x00000000c7bdd8e0> (a
io.netty.channel.nio.SelectedSelectionKeySet)
	- locked <0x00000000c7bdd940> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000c7bdd838> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
	at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
	at
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
	at java.lang.Thread.run(Thread.java:745)

"task-result-getter-3" daemon prio=10 tid=0x00007f676c009000 nid=0x24b6
waiting on condition [0x00007f67b8bf7000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c78ef7d0> (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
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:745)

"task-result-getter-2" daemon prio=10 tid=0x00007f6764007000 nid=0x24b5
waiting on condition [0x00007f67b8cf8000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c78ef7d0> (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
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:745)

"task-result-getter-1" daemon prio=10 tid=0x00007f675c004000 nid=0x24b4
waiting on condition [0x00007f67b8df9000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c78ef7d0> (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
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:745)

"task-result-getter-0" daemon prio=10 tid=0x00007f6768010000 nid=0x24b3
waiting on condition [0x00007f67c862b000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c78ef7d0> (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
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:745)

"shuffle-server-6" daemon prio=10 tid=0x00007f66e4011800 nid=0x24b2 runnable
[0x00007f66cbef9000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
	- locked <0x00000000c8de9f60> (a
io.netty.channel.nio.SelectedSelectionKeySet)
	- locked <0x00000000c8de9f50> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000c8de9f80> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
	at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
	at
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
	at java.lang.Thread.run(Thread.java:745)

"shuffle-server-5" daemon prio=10 tid=0x00007f66e4010000 nid=0x24b1 runnable
[0x00007f67b8efa000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
	- locked <0x00000000c7bde078> (a
io.netty.channel.nio.SelectedSelectionKeySet)
	- locked <0x00000000c7bde0d8> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000c7bddfe0> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
	at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
	at
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
	at java.lang.Thread.run(Thread.java:745)

"shuffle-server-4" daemon prio=10 tid=0x00007f66e400c800 nid=0x24b0 runnable
[0x00007f66cdffc000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
	- locked <0x00000000c8e06ae8> (a
io.netty.channel.nio.SelectedSelectionKeySet)
	- locked <0x00000000c8e06ad8> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000c8e06b08> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
	at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
	at
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
	at java.lang.Thread.run(Thread.java:745)

"shuffle-server-3" daemon prio=10 tid=0x00007f66e400b000 nid=0x24af runnable
[0x00007f67b8ffb000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
	- locked <0x00000000c8e0d190> (a
io.netty.channel.nio.SelectedSelectionKeySet)
	- locked <0x00000000c8e0d180> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000c8e0d1b0> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
	at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
	at
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
	at java.lang.Thread.run(Thread.java:745)

"shuffle-server-2" daemon prio=10 tid=0x00007f66e4008800 nid=0x24ae runnable
[0x00007f67c01e2000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
	- locked <0x00000000c8e49100> (a
io.netty.channel.nio.SelectedSelectionKeySet)
	- locked <0x00000000c8e490f0> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000c8e49120> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
	at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
	at
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
	at java.lang.Thread.run(Thread.java:745)

"shuffle-server-1" daemon prio=10 tid=0x00007f66e400a000 nid=0x24ad runnable
[0x00007f67d1f8e000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
	- locked <0x00000000c8d31698> (a
io.netty.channel.nio.SelectedSelectionKeySet)
	- locked <0x00000000c8d316f8> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000c8d31600> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
	at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
	at
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
	at java.lang.Thread.run(Thread.java:745)

"java-sdk-http-connection-reaper" daemon prio=10 tid=0x000000000256f000
nid=0x24ac waiting on condition [0x00007f67c04f0000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
	at java.lang.Thread.sleep(Native Method)
	at
com.amazonaws.http.IdleConnectionReaper.run(IdleConnectionReaper.java:112)

"shuffle-server-7" daemon prio=10 tid=0x00007f674800d000 nid=0x24ab runnable
[0x00007f67c25f3000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
	- locked <0x00000000c6603918> (a
io.netty.channel.nio.SelectedSelectionKeySet)
	- locked <0x00000000c66049d8> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000c6603870> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
	at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
	at
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
	at java.lang.Thread.run(Thread.java:745)

"shuffle-server-6" daemon prio=10 tid=0x00007f674800b000 nid=0x24aa runnable
[0x00007f67c26f4000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
	- locked <0x00000000c78aa328> (a
io.netty.channel.nio.SelectedSelectionKeySet)
	- locked <0x00000000c78aa348> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000c78aa2e0> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
	at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
	at
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
	at java.lang.Thread.run(Thread.java:745)

"shuffle-server-5" daemon prio=10 tid=0x00007f6748009000 nid=0x24a9 runnable
[0x00007f67c27f5000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
	- locked <0x00000000c8ccfca0> (a
io.netty.channel.nio.SelectedSelectionKeySet)
	- locked <0x00000000c8cd0d70> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000c8ccfbf8> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
	at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
	at
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
	at java.lang.Thread.run(Thread.java:745)

"shuffle-server-4" daemon prio=10 tid=0x00007f6748007000 nid=0x24a8 runnable
[0x00007f67c28f6000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
	- locked <0x00000000c54e4cf0> (a
io.netty.channel.nio.SelectedSelectionKeySet)
	- locked <0x00000000c54e4db0> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000c54e4c48> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
	at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
	at
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
	at java.lang.Thread.run(Thread.java:745)

"shuffle-server-3" daemon prio=10 tid=0x00007f6748005000 nid=0x24a7 runnable
[0x00007f67c29f7000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
	- locked <0x00000000c65dae00> (a
io.netty.channel.nio.SelectedSelectionKeySet)
	- locked <0x00000000c65de9d8> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000c65dad58> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
	at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
	at
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
	at java.lang.Thread.run(Thread.java:745)

"shuffle-server-2" daemon prio=10 tid=0x00007f6748003800 nid=0x24a6 runnable
[0x00007f67c2af8000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
	- locked <0x00000000c8ccfa18> (a
io.netty.channel.nio.SelectedSelectionKeySet)
	- locked <0x00000000c77ce728> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000c8ccf970> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
	at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
	at
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
	at java.lang.Thread.run(Thread.java:745)

"shuffle-server-1" daemon prio=10 tid=0x00007f6748001800 nid=0x24a5 runnable
[0x00007f67c2bf9000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
	- locked <0x00000000c54bf8c0> (a
io.netty.channel.nio.SelectedSelectionKeySet)
	- locked <0x00000000c54c3fb0> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000c54bf818> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
	at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
	at
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
	at java.lang.Thread.run(Thread.java:745)

"SparkListenerBus" daemon prio=10 tid=0x00007f6770e64800 nid=0x24a2 waiting
on condition [0x00007f67c2dfb000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c7a97800> (a
java.util.concurrent.Semaphore$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.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:994)
	at
java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1303)
	at java.util.concurrent.Semaphore.acquire(Semaphore.java:317)
	at
org.apache.spark.scheduler.LiveListenerBus$$anon$1$$anonfun$run$1$$anonfun$apply$mcV$sp$1.apply$mcV$sp(LiveListenerBus.scala:67)
	at
org.apache.spark.scheduler.LiveListenerBus$$anon$1$$anonfun$run$1$$anonfun$apply$mcV$sp$1.apply(LiveListenerBus.scala:66)
	at
org.apache.spark.scheduler.LiveListenerBus$$anon$1$$anonfun$run$1$$anonfun$apply$mcV$sp$1.apply(LiveListenerBus.scala:66)
	at scala.util.DynamicVariable.withValue(DynamicVariable.scala:58)
	at
org.apache.spark.scheduler.LiveListenerBus$$anon$1$$anonfun$run$1.apply$mcV$sp(LiveListenerBus.scala:65)
	at org.apache.spark.util.Utils$.tryOrStopSparkContext(Utils.scala:1229)
	at
org.apache.spark.scheduler.LiveListenerBus$$anon$1.run(LiveListenerBus.scala:64)

"context-cleaner-periodic-gc" daemon prio=10 tid=0x00007f6770e61000
nid=0x24a1 waiting on condition [0x00007f67c2efc000]
   java.lang.Thread.State: TIMED_WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c78f33e8> (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:745)

"Spark Context Cleaner" daemon prio=10 tid=0x00007f6770e5f000 nid=0x24a0 in
Object.wait() [0x00007f67c2ffd000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x00000000c78caac0> (a java.lang.ref.ReferenceQueue$Lock)
	at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:135)
	- locked <0x00000000c78caac0> (a java.lang.ref.ReferenceQueue$Lock)
	at
org.apache.spark.ContextCleaner$$anonfun$org$apache$spark$ContextCleaner$$keepCleaning$1.apply$mcV$sp(ContextCleaner.scala:175)
	at org.apache.spark.util.Utils$.tryOrStopSparkContext(Utils.scala:1229)
	at
org.apache.spark.ContextCleaner.org$apache$spark$ContextCleaner$$keepCleaning(ContextCleaner.scala:172)
	at org.apache.spark.ContextCleaner$$anon$1.run(ContextCleaner.scala:67)

"shuffle-server-0" daemon prio=10 tid=0x00007f6770bf9800 nid=0x249f runnable
[0x00007f67c8126000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
	- locked <0x00000000c8d55b88> (a
io.netty.channel.nio.SelectedSelectionKeySet)
	- locked <0x00000000c8d5ce98> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000c8d55af0> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
	at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
	at
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
	at java.lang.Thread.run(Thread.java:745)

"threadDeathWatcher-2-1" daemon prio=10 tid=0x00007f66ec00f800 nid=0x249e
waiting on condition [0x00007f67c8227000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
	at java.lang.Thread.sleep(Native Method)
	at
io.netty.util.ThreadDeathWatcher$Watcher.run(ThreadDeathWatcher.java:137)
	at
io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137)
	at java.lang.Thread.run(Thread.java:745)

"shuffle-client-0" daemon prio=10 tid=0x00007f66e8003800 nid=0x249d runnable
[0x00007f67c8328000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
	- locked <0x00000000c31e90a8> (a
io.netty.channel.nio.SelectedSelectionKeySet)
	- locked <0x00000000c31e90c8> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000c31e9060> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
	at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
	at
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
	at java.lang.Thread.run(Thread.java:745)

"appclient-registration-retry-thread" daemon prio=10 tid=0x00007f6760003800
nid=0x249b waiting on condition [0x00007f67c852a000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c3207ec0> (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$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1079)
	at
java.util.concurrent.ScheduledThreadPoolExecutor$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:745)

"driver-revive-thread" daemon prio=10 tid=0x00007f676800d000 nid=0x2499
waiting on condition [0x00007f67c872c000]
   java.lang.Thread.State: TIMED_WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c8d90dd0> (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:745)

"dag-scheduler-event-loop" daemon prio=10 tid=0x00007f6770be7000 nid=0x2498
waiting on condition [0x00007f67c882d000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c8d897c8> (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.LinkedBlockingDeque.takeFirst(LinkedBlockingDeque.java:489)
	at
java.util.concurrent.LinkedBlockingDeque.take(LinkedBlockingDeque.java:678)
	at org.apache.spark.util.EventLoop$$anon$1.run(EventLoop.scala:46)

"netty-rpc-env-timeout" daemon prio=10 tid=0x00007f670c00c800 nid=0x2497
waiting on condition [0x00007f67c892e000]
   java.lang.Thread.State: TIMED_WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c32087c0> (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:745)

"Timer-0" daemon prio=10 tid=0x00007f6770bb1800 nid=0x2496 in Object.wait()
[0x00007f67c8a2f000]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x00000000c8d884f8> (a java.util.TaskQueue)
	at java.lang.Object.wait(Object.java:503)
	at java.util.TimerThread.mainLoop(Timer.java:526)
	- locked <0x00000000c8d884f8> (a java.util.TaskQueue)
	at java.util.TimerThread.run(Timer.java:505)

"heartbeat-receiver-event-loop-thread" daemon prio=10 tid=0x00007f675c001800
nid=0x2495 waiting on condition [0x00007f67c8b30000]
   java.lang.Thread.State: TIMED_WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c78ef1f0> (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:745)

"SparkUI-59-acceptor-0@26f08623-ServerConnector@78f677cd{HTTP/1.1}{0.0.0.0:4040}"
daemon prio=10 tid=0x00007f6770ad9800 nid=0x2403 runnable
[0x00007f67c8f34000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.ServerSocketChannelImpl.accept0(Native Method)
	at
sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:250)
	- locked <0x00000000c77cd9f8> (a java.lang.Object)
	at
org.spark_project.jetty.server.ServerConnector.accept(ServerConnector.java:377)
	at
org.spark_project.jetty.server.AbstractConnector$Acceptor.run(AbstractConnector.java:500)
	at
org.spark_project.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
	at
org.spark_project.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
	at java.lang.Thread.run(Thread.java:745)

"SparkUI-58-selector-ServerConnectorManager@37faa18/3" daemon prio=10
tid=0x00007f6770ad7800 nid=0x2402 runnable [0x00007f67c9035000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
	- locked <0x00000000c77ccf98> (a sun.nio.ch.Util$2)
	- locked <0x00000000c77ccf88> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000c77cce70> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:102)
	at
org.spark_project.jetty.io.SelectorManager$ManagedSelector.select(SelectorManager.java:601)
	at
org.spark_project.jetty.io.SelectorManager$ManagedSelector.run(SelectorManager.java:550)
	at
org.spark_project.jetty.util.thread.NonBlockingThread.run(NonBlockingThread.java:52)
	at
org.spark_project.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
	at
org.spark_project.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
	at java.lang.Thread.run(Thread.java:745)

"SparkUI-57-selector-ServerConnectorManager@37faa18/2" daemon prio=10
tid=0x00007f6770ad6000 nid=0x2401 runnable [0x00007f67c9136000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
	- locked <0x00000000c77cc4b0> (a sun.nio.ch.Util$2)
	- locked <0x00000000c77cc4a0> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000c77cc388> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:102)
	at
org.spark_project.jetty.io.SelectorManager$ManagedSelector.select(SelectorManager.java:601)
	at
org.spark_project.jetty.io.SelectorManager$ManagedSelector.run(SelectorManager.java:550)
	at
org.spark_project.jetty.util.thread.NonBlockingThread.run(NonBlockingThread.java:52)
	at
org.spark_project.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
	at
org.spark_project.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
	at java.lang.Thread.run(Thread.java:745)

"SparkUI-56-selector-ServerConnectorManager@37faa18/1" daemon prio=10
tid=0x00007f6770ad2000 nid=0x2400 runnable [0x00007f67c9237000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
	- locked <0x00000000c77cd518> (a sun.nio.ch.Util$2)
	- locked <0x00000000c77cd508> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000c77cd3f0> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:102)
	at
org.spark_project.jetty.io.SelectorManager$ManagedSelector.select(SelectorManager.java:601)
	at
org.spark_project.jetty.io.SelectorManager$ManagedSelector.run(SelectorManager.java:550)
	at
org.spark_project.jetty.util.thread.NonBlockingThread.run(NonBlockingThread.java:52)
	at
org.spark_project.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
	at
org.spark_project.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
	at java.lang.Thread.run(Thread.java:745)

"SparkUI-55-selector-ServerConnectorManager@37faa18/0" daemon prio=10
tid=0x00007f6770acc800 nid=0x23ff runnable [0x00007f67d01fb000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
	- locked <0x00000000c77cca18> (a sun.nio.ch.Util$2)
	- locked <0x00000000c77cca08> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000c77cc8f0> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:102)
	at
org.spark_project.jetty.io.SelectorManager$ManagedSelector.select(SelectorManager.java:601)
	at
org.spark_project.jetty.io.SelectorManager$ManagedSelector.run(SelectorManager.java:550)
	at
org.spark_project.jetty.util.thread.NonBlockingThread.run(NonBlockingThread.java:52)
	at
org.spark_project.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
	at
org.spark_project.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
	at java.lang.Thread.run(Thread.java:745)

"map-output-dispatcher-7" daemon prio=10 tid=0x00007f67707b2800 nid=0x23fd
waiting on condition [0x00007f67d02fc000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c8d39b30> (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.spark.MapOutputTrackerMaster$MessageLoop.run(MapOutputTracker.scala:338)
	at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)

"map-output-dispatcher-6" daemon prio=10 tid=0x00007f67707b0800 nid=0x23fc
waiting on condition [0x00007f67d03fd000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c8d39b30> (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.spark.MapOutputTrackerMaster$MessageLoop.run(MapOutputTracker.scala:338)
	at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)

"map-output-dispatcher-5" daemon prio=10 tid=0x00007f67707ae800 nid=0x23fb
waiting on condition [0x00007f67d04fe000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c8d39b30> (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.spark.MapOutputTrackerMaster$MessageLoop.run(MapOutputTracker.scala:338)
	at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)

"map-output-dispatcher-4" daemon prio=10 tid=0x00007f67707ad000 nid=0x23fa
waiting on condition [0x00007f67d05ff000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c8d39b30> (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.spark.MapOutputTrackerMaster$MessageLoop.run(MapOutputTracker.scala:338)
	at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)

"map-output-dispatcher-3" daemon prio=10 tid=0x00007f67707ab000 nid=0x23f9
waiting on condition [0x00007f67d0700000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c8d39b30> (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.spark.MapOutputTrackerMaster$MessageLoop.run(MapOutputTracker.scala:338)
	at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)

"map-output-dispatcher-2" daemon prio=10 tid=0x00007f67707a9000 nid=0x23f8
waiting on condition [0x00007f67d0801000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c8d39b30> (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.spark.MapOutputTrackerMaster$MessageLoop.run(MapOutputTracker.scala:338)
	at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)

"map-output-dispatcher-1" daemon prio=10 tid=0x00007f67707a7800 nid=0x23f7
waiting on condition [0x00007f67d0902000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c8d39b30> (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.spark.MapOutputTrackerMaster$MessageLoop.run(MapOutputTracker.scala:338)
	at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)

"map-output-dispatcher-0" daemon prio=10 tid=0x00007f67707a6000 nid=0x23f6
waiting on condition [0x00007f67d0a03000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c8d39b30> (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.spark.MapOutputTrackerMaster$MessageLoop.run(MapOutputTracker.scala:338)
	at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)

"shuffle-server-0" daemon prio=10 tid=0x00007f677078d000 nid=0x23f5 runnable
[0x00007f67d0b04000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
	- locked <0x00000000c7c80d50> (a
io.netty.channel.nio.SelectedSelectionKeySet)
	- locked <0x00000000c7c80e30> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000c7c80ca8> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
	at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
	at
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
	at java.lang.Thread.run(Thread.java:745)

"dispatcher-event-loop-7" daemon prio=10 tid=0x00007f677052c000 nid=0x23f3
waiting on condition [0x00007f67d0c05000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c7b0d7d8> (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.spark.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:205)
	at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)

"dispatcher-event-loop-6" daemon prio=10 tid=0x00007f677052a000 nid=0x23f2
waiting on condition [0x00007f67d0d06000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c7b0d7d8> (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.spark.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:205)
	at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)

"dispatcher-event-loop-5" daemon prio=10 tid=0x00007f6770528000 nid=0x23f1
waiting on condition [0x00007f67d0e07000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c7b0d7d8> (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.spark.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:205)
	at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)

"dispatcher-event-loop-4" daemon prio=10 tid=0x00007f677051d800 nid=0x23f0
waiting on condition [0x00007f67d0f08000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c7b0d7d8> (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.spark.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:205)
	at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)

"dispatcher-event-loop-3" daemon prio=10 tid=0x00007f677051c000 nid=0x23ef
waiting on condition [0x00007f67d1009000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c7b0d7d8> (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.spark.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:205)
	at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)

"dispatcher-event-loop-2" daemon prio=10 tid=0x00007f677051a800 nid=0x23ee
waiting on condition [0x00007f67d110a000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c7b0d7d8> (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.spark.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:205)
	at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)

"dispatcher-event-loop-1" daemon prio=10 tid=0x00007f6770523000 nid=0x23ed
waiting on condition [0x00007f67d120b000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c7b0d7d8> (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.spark.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:205)
	at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)

"dispatcher-event-loop-0" daemon prio=10 tid=0x00007f6770522000 nid=0x23ec
waiting on condition [0x00007f67d150d000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c7b0d7d8> (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.spark.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:205)
	at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)

"Service Thread" daemon prio=10 tid=0x00007f67ec0bd000 nid=0x23d8 runnable
[0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C2 CompilerThread1" daemon prio=10 tid=0x00007f67ec0ba800 nid=0x23d7
waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C2 CompilerThread0" daemon prio=10 tid=0x00007f67ec0b7800 nid=0x23d6
waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Signal Dispatcher" daemon prio=10 tid=0x00007f67ec0b5800 nid=0x23d5
runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Finalizer" daemon prio=10 tid=0x00007f67ec088800 nid=0x23d4 in
Object.wait() [0x00007f67d39f8000]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x00000000c7863020> (a java.lang.ref.ReferenceQueue$Lock)
	at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:135)
	- locked <0x00000000c7863020> (a java.lang.ref.ReferenceQueue$Lock)
	at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:151)
	at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)

"Reference Handler" daemon prio=10 tid=0x00007f67ec086800 nid=0x23d3 in
Object.wait() [0x00007f67d3af9000]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x00000000c7862b20> (a java.lang.ref.Reference$Lock)
	at java.lang.Object.wait(Object.java:503)
	at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:133)
	- locked <0x00000000c7862b20> (a java.lang.ref.Reference$Lock)

"VM Thread" prio=10 tid=0x00007f67ec082000 nid=0x23d2 runnable 

"GC task thread#0 (ParallelGC)" prio=10 tid=0x00007f67ec023000 nid=0x23ca
runnable 

"GC task thread#1 (ParallelGC)" prio=10 tid=0x00007f67ec025000 nid=0x23cb
runnable 

"GC task thread#2 (ParallelGC)" prio=10 tid=0x00007f67ec027000 nid=0x23cc
runnable 

"GC task thread#3 (ParallelGC)" prio=10 tid=0x00007f67ec029000 nid=0x23cd
runnable 

"GC task thread#4 (ParallelGC)" prio=10 tid=0x00007f67ec02a800 nid=0x23ce
runnable 

"GC task thread#5 (ParallelGC)" prio=10 tid=0x00007f67ec02c800 nid=0x23cf
runnable 

"GC task thread#6 (ParallelGC)" prio=10 tid=0x00007f67ec02e800 nid=0x23d0
runnable 

"GC task thread#7 (ParallelGC)" prio=10 tid=0x00007f67ec030800 nid=0x23d1
runnable 

"VM Periodic Task Thread" prio=10 tid=0x00007f67ec0c8000 nid=0x23d9 waiting
on condition 

JNI global references: 391





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