Hello,
A machine X which is the master: it is the jobtracker, namenode and
secondary namenode.
It is not in the slaves file and  is not part of the HDFSHowever in
the mapreduce web page, I notice it is being used as a tasktracker.
Is the jobtracker always a tasktracker? I'd rather not place too much
load on the one machine which plays so many roles.
(Hadoop 0.19.0)

Thanks
Saptarshi

The jobtracker does not have to be a tasktracker.  Just stop and don't start
the tasktracker process.
Bill

On Sun, Mar 29, 2009 at 12:00 PM, Saptarshi Guha
<[EMAIL PROTECTED]>wrote:

> Hello,
> A machine X which is the master: it is the jobtracker, namenode and
> secondary namenode.
> It is not in the slaves file and  is not part of the HDFSHowever in
> the mapreduce web page, I notice it is being used as a tasktracker.
> Is the jobtracker always a tasktracker? I'd rather not place too much
> load on the one machine which plays so many roles.
> (Hadoop 0.19.0)
>
> Thanks
> Saptarshi
>

Aha,there isn't a tasktracker running on X, yet jps shows 4 children
and when jobs fail i see failures on X too.
So what exactly can I stop?
jps output on X
20044 org.apache.hadoop.mapred.JobTracker
12871 org.apache.hadoop.mapred.Child 127.0.0.1 51590
attempt_200903302220_0036_m_000020_0 -541073721
12819 org.apache.hadoop.mapred.Child 127.0.0.1 51590
attempt_200903302220_0036_m_000003_0 1185151254
19768 org.apache.hadoop.hdfs.server.namenode.NameNode
13004 org.apache.hadoop.mapred.Child 127.0.0.1 51590
attempt_200903302220_0036_r_000010_0 1044080068
11396 org.saptarshiguha.rhipe.rhipeserver.RHIPEMain --tsp=mimosa:8200
--listen=4445 --quiet --no-save --max-nsize=1G --max-ppsize=100000
19961 org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode
13131 sun.tools.jps.Jps -ml
22054
12931 org.apache.hadoop.mapred.Child 127.0.0.1 51590
attempt_200903302220_0036_m_000032_0 -690673928
12962 org.apache.hadoop.mapred.Child 127.0.0.1 51590
attempt_200903302220_0036_m_000033_0 203873369

Saptarshi Guha

On Mon, Mar 30, 2009 at 11:37 AM, Saptarshi Guha
<[EMAIL PROTECTED]> wrote:
> thanks
> Saptarshi Guha
>
>
>
> On Sun, Mar 29, 2009 at 7:42 PM, Bill Au <[EMAIL PROTECTED]> wrote:
>> The jobtracker does not have to be a tasktracker.  Just stop and don't start
>> the tasktracker process.
>> Bill
>>
>> On Sun, Mar 29, 2009 at 12:00 PM, Saptarshi Guha <[EMAIL PROTECTED]>
>> wrote:
>>>
>>> Hello,
>>> A machine X which is the master: it is the jobtracker, namenode and
>>> secondary namenode.
>>> It is not in the slaves file and  is not part of the HDFSHowever in
>>> the mapreduce web page, I notice it is being used as a tasktracker.
>>> Is the jobtracker always a tasktracker? I'd rather not place too much
>>> load on the one machine which plays so many roles.
>>> (Hadoop 0.19.0)
>>>
>>> Thanks
>>> Saptarshi
>>
>>
>