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From Edward Capriolo <edlinuxg...@gmail.com>
Subject Re: How to disable secondary node
Date Thu, 09 Sep 2010 14:59:39 GMT
It is a bad idea to permanently disable 2nn. The edits file grows very
very large and will not be processed until the name node restart. We
had a 12GB edit file that took 40 minutes of downtime to process.

On Thu, Sep 9, 2010 at 3:08 AM, Jeff Zhang <zjffdu@gmail.com> wrote:
> then, do not start secondary namenode
> (
>  comment the last line of start-dfs.sh
>  #  "$bin"/hadoop-daemons.sh --config $HADOOP_CONF_DIR --hosts masters
> start secondarynamenode
> )
>
>
>
> On Wed, Sep 8, 2010 at 11:36 PM, akhilesh.kumar
> <akhilesh.kumar@zapak.co.in> wrote:
>> Hi ,
>>    Can any one help me in disabling secondary namenode feature of hdfs .
>>
>> Regards
>> Akhilesh
>>
>> -----Original Message-----
>> From: ChingShen [mailto:chingshenchen@gmail.com]
>> Sent: Thursday, September 09, 2010 12:07 PM
>> To: common-user@hadoop.apache.org
>> Subject: Questions about BN and CN
>>
>> Hi all,
>>
>>  I got the Backup node(BN) that includes all the checkpoint
>> responsibilities,
>>  and it maintains an up-to-date namespace state, which is always in
>> sync with the active NN.
>>
>>  Q1. In which situation do we need a CN?
>>
>>  Q2. If the NameNode machine fails, which different manual
>> intervention between BN and CN?
>>
>> Thanks.
>>
>> Shen
>>
>>
>
>
>
> --
> Best Regards
>
> Jeff Zhang
>

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