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From Sedighe Tabatabaei <tabatabaei...@gmail.com>
Subject Child processes on datanodes/task trackers
Date Sat, 22 Dec 2012 10:16:20 GMT
Hello
I wanted to know why I see running Child processes on my datanodes
even though there is no job running at that time.
when i use  jstack  <pid> command,result is:

Full thread dump Java HotSpot(TM) 64-Bit Server VM (17.1-b03 mixed mode):

"Attach Listener" daemon prio=10 tid=0x00007f2a74002000 nid=0x1f3
waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"SIGTERM handler" daemon prio=10 tid=0x00007f2a74001000 nid=0x2fae
waiting for monitor entry [0x00007f2a79891000]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at java.lang.Shutdown.exit(Shutdown.java:168)
	- waiting to lock <0x00007f2a9ffa68d0> (a java.lang.Class for
java.lang.Shutdown)
	at java.lang.Terminator$1.handle(Terminator.java:35)
	at sun.misc.Signal$1.run(Signal.java:195)
	at java.lang.Thread.run(Thread.java:662)

"Thread-16" prio=10 tid=0x00007f2ae83d1000 nid=0x2f85 runnable
[0x00007f2a9cb5a000]
   java.lang.Thread.State: RUNNABLE
	at java.lang.Throwable.fillInStackTrace(Native Method)
	- locked <0x00007f2ad36e4d50> (a java.util.ConcurrentModificationException)
	at java.lang.Throwable.<init>(Throwable.java:181)
	at java.lang.Exception.<init>(Exception.java:29)
	at java.lang.RuntimeException.<init>(RuntimeException.java:32)
	at java.util.ConcurrentModificationException.<init>(ConcurrentModificationException.java:57)
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
	at java.util.HashMap$KeyIterator.next(HashMap.java:828)
	at com.sun.media.jai.codec.TempFileCleanupThread.run(FileCacheSeekableStream.java:315)

"DestroyJavaVM" prio=10 tid=0x00007f2ae8009800 nid=0x1113 in
Object.wait() [0x00007f2aedb81000]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x00007f2aa5248528> (a
com.sun.media.jai.codec.TempFileCleanupThread)
	at java.lang.Thread.join(Thread.java:1186)
	- locked <0x00007f2aa5248528> (a com.sun.media.jai.codec.TempFileCleanupThread)
	at java.lang.Thread.join(Thread.java:1239)
	at java.lang.ApplicationShutdownHooks.runHooks(ApplicationShutdownHooks.java:79)
	at java.lang.ApplicationShutdownHooks$1.run(ApplicationShutdownHooks.java:24)
	at java.lang.Shutdown.runHooks(Shutdown.java:79)
	at java.lang.Shutdown.sequence(Shutdown.java:123)
	at java.lang.Shutdown.shutdown(Shutdown.java:190)
	- locked <0x00007f2a9ffa68d0> (a java.lang.Class for java.lang.Shutdown)

"Java2D Disposer" daemon prio=10 tid=0x00007f2ae8415000 nid=0x1775 in
Object.wait() [0x00007f2a7a16d000]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x00007f2aa528a748> (a java.lang.ref.ReferenceQueue$Lock)
	at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118)
	- locked <0x00007f2aa528a748> (a java.lang.ref.ReferenceQueue$Lock)
	at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134)
	at sun.java2d.Disposer.run(Disposer.java:127)
	at java.lang.Thread.run(Thread.java:662)

"Thread for syncLogs" daemon prio=10 tid=0x00007f2ae83bf000 nid=0x1208
waiting on condition [0x00007f2a9f2fa000]
   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=0x00007f2ae8093000 nid=0x112f
runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"CompilerThread1" daemon prio=10 tid=0x00007f2ae8090800 nid=0x112d
waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"CompilerThread0" daemon prio=10 tid=0x00007f2ae808d800 nid=0x112a
waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Signal Dispatcher" daemon prio=10 tid=0x00007f2ae808b800 nid=0x1129
runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Finalizer" daemon prio=10 tid=0x00007f2ae806d000 nid=0x1126 in
Object.wait() [0x00007f2a9fafd000]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x00007f2aa50c8bf0> (a java.lang.ref.ReferenceQueue$Lock)
	at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118)
	- locked <0x00007f2aa50c8bf0> (a java.lang.ref.ReferenceQueue$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=0x00007f2ae806b000 nid=0x1124
in Object.wait() [0x00007f2a9fbfe000]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x00007f2aa50c8ba8> (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 <0x00007f2aa50c8ba8> (a java.lang.ref.Reference$Lock)

"VM Thread" prio=10 tid=0x00007f2ae8066800 nid=0x1122 runnable

"GC task thread#0 (ParallelGC)" prio=10 tid=0x00007f2ae801c800
nid=0x1114 runnable

"GC task thread#1 (ParallelGC)" prio=10 tid=0x00007f2ae801e800
nid=0x1115 runnable

"GC task thread#2 (ParallelGC)" prio=10 tid=0x00007f2ae8020000
nid=0x111c runnable

"GC task thread#3 (ParallelGC)" prio=10 tid=0x00007f2ae8022000
nid=0x111f runnable

"VM Periodic Task Thread" prio=10 tid=0x00007f2ae809d000 nid=0x1131
waiting on condition

JNI global references: 1774


Thanks, Tabatabaei

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