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Date: Wed, 25 Aug 2010 19:59:34 -0700 (PDT)
From: C J <c.joshi26@yahoo.com>
Subject: Re: Child processes on datanodes/task trackers
To: general@hadoop.apache.org
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Thanks Ted!

I did a jstack and it seems there is an issue with ehcache that I am using in 
the mapper task. 


"net.sf.ehcache.CacheManager@57ac3379" daemon prio=10 tid=0x0000000059180800 
nid=0x379e in Object.wait() [0x0000000041506000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x00002aaabb0b89a8> (a java.util.TaskQueue)
        at java.util.TimerThread.mainLoop(Timer.java:509)
        - locked <0x00002aaabb0b89a8> (a java.util.TaskQueue)
        at java.util.TimerThread.run(Timer.java:462)

   Locked ownable synchronizers:
        - None
.
.
.


The hadoop version I am using is 0.20.2.

Thanks.


________________________________
From: Ted Yu <yuzhihong@gmail.com>
To: general@hadoop.apache.org
Sent: Wed, August 25, 2010 7:34:35 PM
Subject: Re: Child processes on datanodes/task trackers

After you obtain pid, you can use jstack to see what the Child process was
doing.

What hadoop version are you using ?

On Wed, Aug 25, 2010 at 7:28 PM, C J <c.joshi26@yahoo.com> wrote:

> Thanks for your reply.
>
> Some of these child tasks belong to successful jobs. I am wondering why
> they are
> still hanging there for long finished jobs.
>
>
>
>
>
> ________________________________
> From: Ted Yu <yuzhihong@gmail.com>
> To: general@hadoop.apache.org
> Sent: Wed, August 25, 2010 4:17:38 PM
> Subject: Re: Child processes on datanodes/task trackers
>
> Use jps to find out pid of the Child.
> Then use this to find out which job the Child belongs to:
> ps aux | grep <pid>
>
> On Wed, Aug 25, 2010 at 12:20 PM, C J <c.joshi26@yahoo.com> wrote:
>
> > Hi,
> >
> > I wanted to know why I see running Child processes on my datanodes even
> > though
> > there is no job running at that time. Are these left over from failed
> > attempts?
> >
> > Is there anything I can do to keep these clean?
> >
> > Thanks,
> > Deepika
> >
> >
> >
>
>
>
>
>


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