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Posted to common-user@hadoop.apache.org by 叶双明 <ye...@gmail.com> on 2008/09/06 11:26:32 UTC
is SecondaryNameNode in support for the NameNode?
Hi all!
The NameNode is a Single Point of Failure for the HDFS Cluster. There
is support for NameNodeFailover, with a SecondaryNameNode hosted on a
separate machine being able to stand in for the original NameNode if
it goes down.
Is it right? is SecondaryNameNode in support for the NameNode?
Sorry for my englist!!
明
Re: is SecondaryNameNode in support for the NameNode?
Posted by 叶双明 <ye...@gmail.com>.
Thanks for all !
2008/9/9 Konstantin Shvachko <sh...@yahoo-inc.com>
> NameNodeFailover <http://wiki.apache.org/hadoop/NameNodeFailover>, with a
>> SecondaryNameNode <http://wiki.apache.org/hadoop/SecondaryNameNode>
>> hosted
>>
>> I think it is wrong, please correct it.
>>
>
> You probably look at some cached results. Both pages do not exist.
> The first one was a cause of confusion and was removed.
>
> Regards,
> --Konstantin
>
> 2008/9/6, Jean-Daniel Cryans <jd...@apache.org>:
>>
>>> Hi,
>>>
>>> See http://wiki.apache.org/hadoop/FAQ#7 and
>>>
>>>
>> http://hadoop.apache.org/core/docs/r0.17.2/hdfs_user_guide.html#Secondary+Namenode
>>
>>> Regards,
>>>
>>> J-D
>>>
>>> On Sat, Sep 6, 2008 at 5:26 AM, ??? <ye...@gmail.com> wrote:
>>>
>>> Hi all!
>>>>
>>>> The NameNode is a Single Point of Failure for the HDFS Cluster. There
>>>> is support for NameNodeFailover, with a SecondaryNameNode hosted on a
>>>> separate machine being able to stand in for the original NameNode if
>>>> it goes down.
>>>>
>>>> Is it right? is SecondaryNameNode in support for the NameNode?
>>>>
>>>> Sorry for my englist!!
>>>> ?
>>>>
>>>>
>>
>>
--
Sorry for my englist!! 明
Re: is SecondaryNameNode in support for the NameNode?
Posted by Konstantin Shvachko <sh...@yahoo-inc.com>.
> NameNodeFailover <http://wiki.apache.org/hadoop/NameNodeFailover>, with a
> SecondaryNameNode <http://wiki.apache.org/hadoop/SecondaryNameNode> hosted
>
> I think it is wrong, please correct it.
You probably look at some cached results. Both pages do not exist.
The first one was a cause of confusion and was removed.
Regards,
--Konstantin
> 2008/9/6, Jean-Daniel Cryans <jd...@apache.org>:
>> Hi,
>>
>> See http://wiki.apache.org/hadoop/FAQ#7 and
>>
> http://hadoop.apache.org/core/docs/r0.17.2/hdfs_user_guide.html#Secondary+Namenode
>> Regards,
>>
>> J-D
>>
>> On Sat, Sep 6, 2008 at 5:26 AM, ??? <ye...@gmail.com> wrote:
>>
>>> Hi all!
>>>
>>> The NameNode is a Single Point of Failure for the HDFS Cluster. There
>>> is support for NameNodeFailover, with a SecondaryNameNode hosted on a
>>> separate machine being able to stand in for the original NameNode if
>>> it goes down.
>>>
>>> Is it right? is SecondaryNameNode in support for the NameNode?
>>>
>>> Sorry for my englist!!
>>> ?
>>>
>
>
Re: is SecondaryNameNode in support for the NameNode?
Posted by Jean-Daniel Cryans <jd...@apache.org>.
Yes, I agree that that page is confusing. There was a thread named
"Confusing NameNodeFailover page in Hadoop Wiki" in August and some stuff
was done (like the failover page was removed) but my guess is that there is
still work to do.
Since this is an open wiki, anyone can edit it (smile).
J-D
On Sat, Sep 6, 2008 at 9:42 AM, 叶双明 <ye...@gmail.com> wrote:
> Actually, I hava readed about: The term "secondary name-node" is somewhat
> misleading. It is not a name-node in the sense that data-nodes cannot
> connect to the secondary name-node, and in no event it can replace the
> primary name-node in case of its failure.
>
> But today, I read another article in the hadoop wiki
> http://wiki.apache.org/hadoop/NameNode, which contain: The NameNode is a
> Single Point of Failure for the HDFS Cluster. There is support for
> NameNodeFailover <http://wiki.apache.org/hadoop/NameNodeFailover>, with a
> SecondaryNameNode <http://wiki.apache.org/hadoop/SecondaryNameNode> hosted
> on a separate machine being able to stand in for the original NameNode if
> it
> goes down.
>
> I think it is wrong, please correct it.
>
> 2008/9/6, Jean-Daniel Cryans <jd...@apache.org>:
> > Hi,
> >
> > See http://wiki.apache.org/hadoop/FAQ#7 and
> >
>
> http://hadoop.apache.org/core/docs/r0.17.2/hdfs_user_guide.html#Secondary+Namenode
> >
> > Regards,
> >
> > J-D
> >
> > On Sat, Sep 6, 2008 at 5:26 AM, 叶双明 <ye...@gmail.com> wrote:
> >
> > > Hi all!
> > >
> > > The NameNode is a Single Point of Failure for the HDFS Cluster. There
> > > is support for NameNodeFailover, with a SecondaryNameNode hosted on a
> > > separate machine being able to stand in for the original NameNode if
> > > it goes down.
> > >
> > > Is it right? is SecondaryNameNode in support for the NameNode?
> > >
> > > Sorry for my englist!!
> > > 明
> > >
> >
>
>
> --
> Sorry for my englist!!
> 明
>
Re: is SecondaryNameNode in support for the NameNode?
Posted by 叶双明 <ye...@gmail.com>.
Actually, I hava readed about: The term "secondary name-node" is somewhat
misleading. It is not a name-node in the sense that data-nodes cannot
connect to the secondary name-node, and in no event it can replace the
primary name-node in case of its failure.
But today, I read another article in the hadoop wiki
http://wiki.apache.org/hadoop/NameNode, which contain: The NameNode is a
Single Point of Failure for the HDFS Cluster. There is support for
NameNodeFailover <http://wiki.apache.org/hadoop/NameNodeFailover>, with a
SecondaryNameNode <http://wiki.apache.org/hadoop/SecondaryNameNode> hosted
on a separate machine being able to stand in for the original NameNode if it
goes down.
I think it is wrong, please correct it.
2008/9/6, Jean-Daniel Cryans <jd...@apache.org>:
> Hi,
>
> See http://wiki.apache.org/hadoop/FAQ#7 and
>
http://hadoop.apache.org/core/docs/r0.17.2/hdfs_user_guide.html#Secondary+Namenode
>
> Regards,
>
> J-D
>
> On Sat, Sep 6, 2008 at 5:26 AM, 叶双明 <ye...@gmail.com> wrote:
>
> > Hi all!
> >
> > The NameNode is a Single Point of Failure for the HDFS Cluster. There
> > is support for NameNodeFailover, with a SecondaryNameNode hosted on a
> > separate machine being able to stand in for the original NameNode if
> > it goes down.
> >
> > Is it right? is SecondaryNameNode in support for the NameNode?
> >
> > Sorry for my englist!!
> > 明
> >
>
--
Sorry for my englist!!
明
Re: is SecondaryNameNode in support for the NameNode?
Posted by Jean-Daniel Cryans <jd...@apache.org>.
Hi,
See http://wiki.apache.org/hadoop/FAQ#7 and
http://hadoop.apache.org/core/docs/r0.17.2/hdfs_user_guide.html#Secondary+Namenode
Regards,
J-D
On Sat, Sep 6, 2008 at 5:26 AM, 叶双明 <ye...@gmail.com> wrote:
> Hi all!
>
> The NameNode is a Single Point of Failure for the HDFS Cluster. There
> is support for NameNodeFailover, with a SecondaryNameNode hosted on a
> separate machine being able to stand in for the original NameNode if
> it goes down.
>
> Is it right? is SecondaryNameNode in support for the NameNode?
>
> Sorry for my englist!!
> 明
>