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From Konstantin Shvachko <...@yahoo-inc.com>
Subject Re: How to disable secondary node
Date Wed, 22 Sep 2010 21:24:56 GMT
If a CheckpointNode or a BackupNode is used then the SecondaryNameNode should be disabled.
--Konstantin

On 9/9/2010 7:59 AM, Edward Capriolo wrote:
> 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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