pointing is still an expensive operation.
I'd say every hour or even every day.
Isn't the default 3600 seconds?
Koji
-Original Message-
From: jason hadoop [mailto:jason.had...@gmail.com]
Sent: Thursday, May 14, 2009 7:46 AM
To: core-user@hadoop.apache.org
Subject: Re: Setting u
n Kimball wrote:
>>
>>> See this regarding instructions on configuring a 2NN on a separate
>>> machine
>>> from the NN:
>>>
>>> http://www.cloudera.com/blog/2009/02/10/multi-host-secondarynamenode-configuration/
>>>
>>> - A
ssage-
From: Brian Bockelman [mailto:bbock...@cse.unl.edu]
Sent: Thursday, May 14, 2009 10:32 AM
To: core-user@hadoop.apache.org
Subject: Re: Setting up another machine as secondary node
Hey Koji,
It's an expensive operation - for the secondary namenode, not the
namenode itself, right?
>
>> -Original Message-
>> From: Brian Bockelman [mailto:bbock...@cse.unl.edu]
>> Sent: Thursday, May 14, 2009 10:32 AM
>> To: core-user@hadoop.apache.org
>> Subject: Re: Setting up another machine as secondary node
>>
>> Hey Koji,
>>
>> It
i
>
> -Original Message-
> From: Brian Bockelman [mailto:bbock...@cse.unl.edu]
> Sent: Thursday, May 14, 2009 10:32 AM
> To: core-user@hadoop.apache.org
> Subject: Re: Setting up another machine as secondary node
>
> Hey Koji,
>
> It's an expensive operation
0.19 or later.
Koji
-Original Message-
From: Brian Bockelman [mailto:bbock...@cse.unl.edu]
Sent: Thursday, May 14, 2009 10:32 AM
To: core-user@hadoop.apache.org
Subject: Re: Setting up another machine as secondary node
Hey Koji,
It's an expensive operation - for the secondary nam
;d say every hour or even every day.
Isn't the default 3600 seconds?
Koji
-Original Message-
From: jason hadoop [mailto:jason.had...@gmail.com]
Sent: Thursday, May 14, 2009 7:46 AM
To: core-user@hadoop.apache.org
Subject: Re: Setting up another machine as secondary node
any machin
From: jason hadoop [mailto:jason.had...@gmail.com]
Sent: Thursday, May 14, 2009 7:46 AM
To: core-user@hadoop.apache.org
Subject: Re: Setting up another machine as secondary node
any machine put in the conf/masters file becomes a secondary namenode.
At some point there was confusion on the safety of more than
any machine put in the conf/masters file becomes a secondary namenode.
At some point there was confusion on the safety of more than one machine,
which I believe was settled, as many are safe.
The secondary namenode takes a snapshot at 5 minute (configurable)
intervals, rebuilds the fsimage and se
First of all, the secondary namenode is not a what you might think a
secondary is - it's not failover device. It does make a copy of the
filesystem metadata periodically, and it integrates the edits into the
image. It does *not* provide failover.
Second, you specify its IP address in hadoop-site
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