Hello Edson,
Thank you for your reply. I don't want to kill them, I want to know why
these child processes don't exit, and to know how to make them exit
successfully when they finish. Any ideas? Thank you.
LvZheng
2010/2/18 Edson Ramiro <erlfi...@gmail.com>
> Do you want to kill them ?
>
> if yes, you can use
>
> ./bin/slaves.sh pkill java
>
> but it will kill the datanode and tasktracker processes
> in all slaves and you'll need to start these processes again.
>
> Edson Ramiro
>
>
> On 14 February 2010 22:09, Zheng Lv <lvzheng19800...@gmail.com> wrote:
>
> > any idea?
> >
> > 2010/2/11 Zheng Lv <lvzheng19800...@gmail.com>
> >
> > > Hello Everyone,
> > > We often find many child processes in datanodes, which have already
> > > finished for long time. And following are the jstack log:
> > > Full thread dump Java HotSpot(TM) 64-Bit Server VM (14.3-b01 mixed
> > mode):
> > > "DestroyJavaVM" prio=10 tid=0x00002aaac8019800 nid=0x2422 waiting on
> > > condition [0x0000000000000000]
> > > java.lang.Thread.State: RUNNABLE
> > > "NioProcessor-31" prio=10 tid=0x00000000439fa000 nid=0x2826 runnable
> > > [0x000000004100a000]
> > > java.lang.Thread.State: RUNNABLE
> > > at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
> > > at
> sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
> > > at
> > sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
> > > at
> sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
> > > - locked <0x00002aaab9b5f6f8> (a sun.nio.ch.Util$1)
> > > - locked <0x00002aaab9b5f710> (a
> > > java.util.Collections$UnmodifiableSet)
> > > - locked <0x00002aaab9b5f680> (a sun.nio.ch.EPollSelectorImpl)
> > > at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
> > > at
> > >
> >
> org.apache.mina.transport.socket.nio.NioProcessor.select(NioProcessor.java:65)
> > > at
> > >
> >
> org.apache.mina.common.AbstractPollingIoProcessor$Worker.run(AbstractPollingIoProcessor.java:672)
> > > at
> > >
> >
> org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:51)
> > > at
> > >
> >
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> > > at
> > >
> >
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> > > at java.lang.Thread.run(Thread.java:619)
> > > "pool-15-thread-1" prio=10 tid=0x00002aaac802d000 nid=0x2825 waiting on
> > > condition [0x0000000041604000]
> > > java.lang.Thread.State: WAITING (parking)
> > > at sun.misc.Unsafe.park(Native Method)
> > > - parking to wait for <0x00002aaab9b61620> (a
> > > java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
> > > at
> > > java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
> > > at
> > >
> >
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
> > > at
> > >
> >
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
> > > at
> > >
> >
> java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:947)
> > > at
> > >
> >
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
> > > at java.lang.Thread.run(Thread.java:619)
> > > "Attach Listener" daemon prio=10 tid=0x0000000043a22800 nid=0x2608
> > waiting
> > > on condition [0x0000000000000000]
> > > java.lang.Thread.State: RUNNABLE
> > > "pool-3-thread-1" prio=10 tid=0x00000000438ad000 nid=0x243f waiting on
> > > condition [0x0000000042575000]
> > > java.lang.Thread.State: TIMED_WAITING (parking)
> > > at sun.misc.Unsafe.park(Native Method)
> > > - parking to wait for <0x00002aaab9ae8770> (a
> > > java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
> > > at
> > > java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:198)
> > > at
> > >
> >
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:1963)
> > > at java.util.concurrent.DelayQueue.take(DelayQueue.java:164)
> > > at
> > >
> >
> java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:583)
> > > at
> > >
> >
> java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:576)
> > > at
> > >
> >
> java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:947)
> > > at
> > >
> >
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
> > > at java.lang.Thread.run(Thread.java:619)
> > > "Thread for syncLogs" daemon prio=10 tid=0x00002aaac4446800 nid=0x2437
> > > waiting on condition [0x0000000040f09000]
> > > java.lang.Thread.State: TIMED_WAITING (sleeping)
> > > at java.lang.Thread.sleep(Native Method)
> > > at org.apache.hadoop.mapred.Child$2.run(Child.java:87)
> > > "Low Memory Detector" daemon prio=10 tid=0x0000000043771800 nid=0x242d
> > > runnable [0x0000000000000000]
> > > java.lang.Thread.State: RUNNABLE
> > > "CompilerThread1" daemon prio=10 tid=0x000000004376e800 nid=0x242c
> > waiting
> > > on condition [0x0000000000000000]
> > > java.lang.Thread.State: RUNNABLE
> > > "CompilerThread0" daemon prio=10 tid=0x000000004376a800 nid=0x242b
> > waiting
> > > on condition [0x0000000000000000]
> > > java.lang.Thread.State: RUNNABLE
> > > "Signal Dispatcher" daemon prio=10 tid=0x0000000043768800 nid=0x242a
> > > runnable [0x0000000000000000]
> > > java.lang.Thread.State: RUNNABLE
> > > "Finalizer" daemon prio=10 tid=0x0000000043746000 nid=0x2429 in
> > > Object.wait() [0x0000000042171000]
> > > java.lang.Thread.State: WAITING (on object monitor)
> > > at java.lang.Object.wait(Native Method)
> > > - waiting on <0x00002aaab9a8afe0> (a
> > > java.lang.ref.ReferenceQueue$Lock)
> > > at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118)
> > > - locked <0x00002aaab9a8afe0> (a
> > java.lang.ref.ReferenceQueue$Lock)
> > > at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134)
> > > at
> > java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)
> > > "Reference Handler" daemon prio=10 tid=0x0000000043744000 nid=0x2428 in
> > > Object.wait() [0x0000000042070000]
> > > java.lang.Thread.State: WAITING (on object monitor)
> > > at java.lang.Object.wait(Native Method)
> > > - waiting on <0x00002aaab96b13a0> (a
> > java.lang.ref.Reference$Lock)
> > > at java.lang.Object.wait(Object.java:485)
> > > at
> > java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116)
> > > - locked <0x00002aaab96b13a0> (a java.lang.ref.Reference$Lock)
> > > "VM Thread" prio=10 tid=0x000000004373d800 nid=0x2427 runnable
> > > "GC task thread#0 (ParallelGC)" prio=10 tid=0x00000000436eb800
> nid=0x2423
> > > runnable
> > > "GC task thread#1 (ParallelGC)" prio=10 tid=0x00000000436ed800
> nid=0x2424
> > > runnable
> > > "GC task thread#2 (ParallelGC)" prio=10 tid=0x00000000436ef800
> > nid=0x2425
> > > runnable
> > > "GC task thread#3 (ParallelGC)" prio=10 tid=0x00000000436f1000
> nid=0x2426
> > > runnable
> > > "VM Periodic Task Thread" prio=10 tid=0x0000000043774000 nid=0x242e
> > waiting
> > > on condition
> > > JNI global references: 871
> > > any suggestion?
> > > best regards,
> > > LvZheng.
> > >
> >
>
