Hi,

In default installation hadoop masters and slaves files contain localhost.
Am I correct that masters file contains  list of SECONDARY namenodes?

If so, will localhost node try to start secondary namenode even if it
already have one?
More over will datanodes try to contact itself in order to try to reach
 secondary namenode on localhost?

should I keep localhost in slaves in case I want to run datanode on same
sever I start cluster and run namemode?

This is my first hadoop experience,
Thanks in advance.

Vitaliy S

Start-dfs.sh script will try to start the secondary namenode on the node listed in masters file.

Datanodes don't connect to the secondary namenode, and slaves file should contain the hostnames where you want to start the datanode. It can be localhost.

On 6/24/10 2:56 AM, "Vitaliy Semochkin" <[EMAIL PROTECTED]> wrote:

Hi,

In default installation hadoop masters and slaves files contain localhost.
Am I correct that masters file contains  list of SECONDARY namenodes?

If so, will localhost node try to start secondary namenode even if it already have one?
More over will datanodes try to contact itself in order to try to reach  secondary namenode on localhost?

should I keep localhost in slaves in case I want to run datanode on same sever I start cluster and run namemode?

This is my first hadoop experience,
Thanks in advance.

Vitaliy S

Thank you very much for reply.

Is there any reason masters file contains localhost in default installation
of hadoop?

On Thu, Jun 24, 2010 at 10:56 PM, Jitendra Nath Pandey <
[EMAIL PROTECTED]> wrote:

>  Start-dfs.sh script will try to start the secondary namenode on the node
> listed in masters file.
>
> Datanodes don’t connect to the secondary namenode, and slaves file should
> contain the hostnames where you want to start the datanode. It can be
> localhost.
>
>
> On 6/24/10 2:56 AM, "Vitaliy Semochkin" <[EMAIL PROTECTED]> wrote:
>
> Hi,
>
> In default installation hadoop masters and slaves files contain localhost.
> Am I correct that masters file contains  list of SECONDARY namenodes?
>
> If so, will localhost node try to start secondary namenode even if it
> already have one?
> More over will datanodes try to contact itself in order to try to reach
>  secondary namenode on localhost?
>
> should I keep localhost in slaves in case I want to run datanode on same
> sever I start cluster and run namemode?
>
> This is my first hadoop experience,
> Thanks in advance.
>
> Vitaliy S
>
>

On Jun 25, 2010, at 2:19 AM, Vitaliy Semochkin wrote:

> Thank you very much for reply.
>
> Is there any reason masters file contains localhost in default installation of hadoop?
Because it would take a long time if we put everyone's hostname in there. :)

Pretty much everything in conf should be looked at during install, including the masters and slaves files.