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Date: Tue, 1 Mar 2011 09:07:40 -0500
Message-ID: <AANLkTimyea5HcspEJmidQze-eUyuQx+C8igW18ntKA3f@mail.gmail.com>
Subject: Re: TaskTracker not starting on all nodes
From: bikash sharma <sharmabiks.07@gmail.com>
To: common-user@hadoop.apache.org
Cc: James Seigel <james@tynt.com>
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Hi James,
Sorry for the late response. No, the same problem persists. I reformatted
HDFS, stopped mapred and hdfs daemons and restarted them (using start-dfs.s=
h
and start-mapred.sh from master node). But surprisingly out of 4 nodes
cluster, two nodes have TaskTracker running while other two do not have
TaskTrackers on them (verified using jps). I guess since I have the Hadoop
installed on shared storage, that might be the issue? Btw, how do I start
the services independently on each node?

-bikash
On Sun, Feb 27, 2011 at 11:05 PM, James Seigel <james@tynt.com> wrote:

> .... Did you get it working?  What was the fix?
>
> Sent from my mobile. Please excuse the typos.
>
> On 2011-02-27, at 8:43 PM, Simon <gsmsteve@gmail.com> wrote:
>
> > Hey Bikash,
> >
> > Maybe you can manually start a  tasktracker on the node and see if ther=
e
> are
> > any error messages. Also, don't forget to check your configure files fo=
r
> > mapreduce and hdfs and make sure datanode can start successfully first.
> > After all these steps, you can submit a job on the master node and see =
if
> > there are any communication between these failed nodes and the master
> node.
> > Post your error messages here if possible.
> >
> > HTH.
> > Simon -
> >
> > On Sat, Feb 26, 2011 at 10:44 AM, bikash sharma <sharmabiks.07@gmail.co=
m
> >wrote:
> >
> >> Thanks James. Well all the config. files and shared keys are on a shar=
ed
> >> storage that is accessed by all the nodes in the cluster.
> >> At times, everything runs fine on initialization, but at other times,
> the
> >> same problem persists, so was bit confused.
> >> Also, checked the TaskTracker logs on those nodes, there does not seem
> to
> >> be
> >> any error.
> >>
> >> -bikash
> >>
> >> On Sat, Feb 26, 2011 at 10:30 AM, James Seigel <james@tynt.com> wrote:
> >>
> >>> Maybe your ssh keys aren=92t distributed the same on each machine or =
the
> >>> machines aren=92t configured the same?
> >>>
> >>> J
> >>>
> >>>
> >>> On 2011-02-26, at 8:25 AM, bikash sharma wrote:
> >>>
> >>>> Hi,
> >>>> I have a 10 nodes Hadoop cluster, where I am running some benchmarks
> >> for
> >>>> experiments.
> >>>> Surprisingly, when I initialize the Hadoop cluster
> >>>> (hadoop/bin/start-mapred.sh), in many instances, only some nodes hav=
e
> >>>> TaskTracker process up (seen using jps), while other nodes do not ha=
ve
> >>>> TaskTrackers. Could anyone please explain?
> >>>>
> >>>> Thanks,
> >>>> Bikash
> >>>
> >>>
> >>
> >
> >
> >
> > --
> > Regards,
> > Simon
>

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