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Date: Wed, 30 Nov 2011 09:22:00 +0530
Message-ID: 
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Subject: Re: Re: [help]how to stop HDFS
From: Nitin Khandelwal <nitin.khandelwal@germinait.com>
To: common-user@hadoop.apache.org
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Hi,

Even i am facing the same problem. There may be some issue with script .
The doc says to start namenode type :
bin/hdfs namenode start

But "start" is not recognized. There is a hack to start namenode with
command "bin/hdfs namenode &" , but no idea how to stop.
If it had been a issue with config , the later also should not have worked.

Thanks,
Nitin


2011/11/30 cat fa <boost.subscribing@gmail.com>

> In fact it's me to say sorry. I used the word "install" which was
> misleading.
>
> In fact I downloaded a tar file and extracted it to =A3=AFusr=A3=AFbin=A3=
=AFhadoop
>
> Could you please tell me where to point those variables=A3=BF
>
> 2011/11/30, Prashant Sharma <prashant.iiith@gmail.com>:
> > I am sorry, I had no idea you have done a rpm install, my suggestion wa=
s
> > based on the assumption that you have done a tar extract install where
> all
> > three distribution have to extracted and then export variables.
> > Also I have no experience with rpm based installs - so no comments abou=
t
> > what went wrong in your case.
> >
> > Basically from the error i can say that it is not able to find the jars
> > needed  on classpath which is referred by scripts through
> > HADOOP_COMMON_HOME. I would say check with the access permission as in
> > which user was it installed with and which user is it running with ?
> >
> > On Tue, Nov 29, 2011 at 10:48 PM, cat fa <boost.subscribing@gmail.com
> >wrote:
> >
> >> Thank you for your help, but I'm still a little confused.
> >> Suppose I installed hadoop in /usr/bin/hadoop/ .Should I
> >> point HADOOP_COMMON_HOME to /usr/bin/hadoop ? Where should I
> >> point HADOOP_HDFS_HOME? Also to /usr/bin/hadoop/ ?
> >>
> >> 2011/11/30 Prashant Sharma <prashant.iiith@gmail.com>
> >>
> >> > I mean, you have to export the variables
> >> >
> >> > export HADOOP_CONF_DIR=3D/path/to/your/configdirectory.
> >> >
> >> > also export HADOOP_HDFS_HOME ,HADOOP_COMMON_HOME. before your run yo=
ur
> >> > command. I suppose this should fix the problem.
> >> > -P
> >> >
> >> > On Tue, Nov 29, 2011 at 6:23 PM, cat fa <boost.subscribing@gmail.com=
>
> >> > wrote:
> >> >
> >> > > it didn't work. It gave me the Usage information.
> >> > >
> >> > > 2011/11/29 hailong.yang1115 <hailong.yang1115@gmail.com>
> >> > >
> >> > > > Try $HADOOP_PREFIX_HOME/bin/hdfs namenode stop --config
> >> > $HADOOP_CONF_DIR
> >> > > > and $HADOOP_PREFIX_HOME/bin/hdfs datanode stop --config
> >> > $HADOOP_CONF_DIR.
> >> > > > It would stop namenode and datanode separately.
> >> > > > The HADOOP_CONF_DIR is the directory where you store your
> >> configuration
> >> > > > files.
> >> > > > Hailong
> >> > > >
> >> > > >
> >> > > >
> >> > > >
> >> > > > ***********************************************
> >> > > > * Hailong Yang, PhD. Candidate
> >> > > > * Sino-German Joint Software Institute,
> >> > > > * School of Computer Science&Engineering, Beihang University
> >> > > > * Phone: (86-010)82315908
> >> > > > * Email: hailong.yang1115@gmail.com
> >> > > > * Address: G413, New Main Building in Beihang University,
> >> > > > *              No.37 XueYuan Road,HaiDian District,
> >> > > > *              Beijing,P.R.China,100191
> >> > > > ***********************************************
> >> > > >
> >> > > > From: cat fa
> >> > > > Date: 2011-11-29 20:22
> >> > > > To: common-user
> >> > > > Subject: Re: [help]how to stop HDFS
> >> > > > use $HADOOP_CONF or $HADOOP_CONF_DIR ? I'm using hadoop 0.23.
> >> > > >
> >> > > > you mean which class? the class of hadoop or of java?
> >> > > >
> >> > > > 2011/11/29 Prashant Sharma <prashant.iiith@gmail.com>
> >> > > >
> >> > > > > Try making $HADOOP_CONF point to right classpath including you=
r
> >> > > > > configuration folder.
> >> > > > >
> >> > > > >
> >> > > > > On Tue, Nov 29, 2011 at 3:58 PM, cat fa <
> >> boost.subscribing@gmail.com
> >> > >
> >> > > > > wrote:
> >> > > > >
> >> > > > > > I used the command :
> >> > > > > >
> >> > > > > > $HADOOP_PREFIX_HOME/bin/hdfs start namenode --config
> >> > $HADOOP_CONF_DIR
> >> > > > > >
> >> > > > > > to sart HDFS.
> >> > > > > >
> >> > > > > > This command is in Hadoop document (here
> >> > > > > > <
> >> > > > > >
> >> > > > >
> >> > > >
> >> > >
> >> >
> >>
> http://hadoop.apache.org/common/docs/r0.23.0/hadoop-yarn/hadoop-yarn-site=
/ClusterSetup.html
> >> > > > > > >)
> >> > > > > >
> >> > > > > > However, I got errors as
> >> > > > > >
> >> > > > > > Exception in thread "main"
> java.lang.NoClassDefFoundError:start
> >> > > > > >
> >> > > > > > Could anyone tell me how to start and stop HDFS?
> >> > > > > >
> >> > > > > > By the way, how to set Gmail so that it doesn't top post my
> >> reply?
> >> > > > > >
> >> > > > >
> >> > > >
> >> > >
> >> >
> >>
> >
>


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Nitin Khandelwal

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