In current hadoop documentation, it is "hadoop balancer [-threshold <threshold>]" to start a balancer and to stop the balancer press ctrl-c.

But in some other places (YDN and older hadoop version documentation), call "start-balancer.sh" to start it and call "stop-balancer.sh" to stop it. And I guess start-balancer.sh can also take an optional argument "[-threshold <threshold>]", right?

Which one is recommended for hadoop 0.20 (I am using CDH3 hadoop-0.20.2+228)?

Thanks,

Michael
      

start-balancer.sh calls 'start balancer'
They have same effect.

On Tue, Aug 24, 2010 at 12:13 PM, jiang licht <[EMAIL PROTECTED]> wrote:

> In current hadoop documentation, it is "hadoop balancer [-threshold
> <threshold>]" to start a balancer and to stop the balancer press ctrl-c.
>
> But in some other places (YDN and older hadoop version documentation), call
> "start-balancer.sh" to start it and call "stop-balancer.sh" to stop it. And
> I guess start-balancer.sh can also take an optional argument "[-threshold
> <threshold>]", right?
>
> Which one is recommended for hadoop 0.20 (I am using CDH3
> hadoop-0.20.2+228)?
>
> Thanks,
>
> Michael
>
>
>

Thanks, Ted. Just check the scripts. Start-balancer.sh calls hadoop-daemon.sh to start balancer, which ofcoz actually calls hadoop to do its job.

Thanks,

Michael

--- On Tue, 8/24/10, Ted Yu <[EMAIL PROTECTED]> wrote:

From: Ted Yu <[EMAIL PROTECTED]>
Subject: Re: command to start and stop balancer?
To: [EMAIL PROTECTED]
Date: Tuesday, August 24, 2010, 2:20 PM

start-balancer.sh calls 'start balancer'
They have same effect.

On Tue, Aug 24, 2010 at 12:13 PM, jiang licht <[EMAIL PROTECTED]> wrote:

> In current hadoop documentation, it is "hadoop balancer [-threshold
> <threshold>]" to start a balancer and to stop the balancer press ctrl-c.
>
> But in some other places (YDN and older hadoop version documentation), call
> "start-balancer.sh" to start it and call "stop-balancer.sh" to stop it. And
> I guess start-balancer.sh can also take an optional argument "[-threshold
> <threshold>]", right?
>
> Which one is recommended for hadoop 0.20 (I am using CDH3
> hadoop-0.20.2+228)?
>
> Thanks,
>
> Michael
>
>
>

      

Just run the balancer and know that it logs progress in its own log file.

Thanks,

Michael

--- On Tue, 8/24/10, Ted Yu <[EMAIL PROTECTED]> wrote:

From: Ted Yu <[EMAIL PROTECTED]>
Subject: Re: command to start and stop balancer?
To: [EMAIL PROTECTED]
Date: Tuesday, August 24, 2010, 2:20 PM

start-balancer.sh calls 'start balancer'
They have same effect.

On Tue, Aug 24, 2010 at 12:13 PM, jiang licht <[EMAIL PROTECTED]> wrote:

> In current hadoop documentation, it is "hadoop balancer [-threshold
> <threshold>]" to start a balancer and to stop the balancer press ctrl-c.
>
> But in some other places (YDN and older hadoop version documentation), call
> "start-balancer.sh" to start it and call "stop-balancer.sh" to stop it. And
> I guess start-balancer.sh can also take an optional argument "[-threshold
> <threshold>]", right?
>
> Which one is recommended for hadoop 0.20 (I am using CDH3
> hadoop-0.20.2+228)?
>
> Thanks,
>
> Michael
>
>
>