Hi ,
    Can any one help me in disabling secondary namenode feature of hdfs .

Regards
Akhilesh      

-----Original Message-----
From: ChingShen [mailto:[EMAIL PROTECTED]]
Sent: Thursday, September 09, 2010 12:07 PM
To: [EMAIL PROTECTED]
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

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
<[EMAIL PROTECTED]> wrote:
> Hi ,
>    Can any one help me in disabling secondary namenode feature of hdfs .
>
> Regards
> Akhilesh
>
> -----Original Message-----
> From: ChingShen [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, September 09, 2010 12:07 PM
> To: [EMAIL PROTECTED]
> 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

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 <[EMAIL PROTECTED]> 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
> <[EMAIL PROTECTED]> wrote:
>> Hi ,
>>    Can any one help me in disabling secondary namenode feature of hdfs .
>>
>> Regards
>> Akhilesh
>>
>> -----Original Message-----
>> From: ChingShen [mailto:[EMAIL PROTECTED]]
>> Sent: Thursday, September 09, 2010 12:07 PM
>> To: [EMAIL PROTECTED]
>> 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
>

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<[EMAIL PROTECTED]>  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
>> <[EMAIL PROTECTED]>  wrote:
>>> Hi ,
>>>     Can any one help me in disabling secondary namenode feature of hdfs .
>>>
>>> Regards
>>> Akhilesh
>>>
>>> -----Original Message-----
>>> From: ChingShen [mailto:[EMAIL PROTECTED]]
>>> Sent: Thursday, September 09, 2010 12:07 PM
>>> To: [EMAIL PROTECTED]
>>> 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
>>
>