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Date: Sun, 24 Apr 2011 10:13:16 -0700
Message-ID: <BANLkTin0FhDAB7guyUxSOcMtG29V_CO0Mw@mail.gmail.com>
Subject: Re: HDFS + ZooKeeper
From: Jason Rutherglen <jason.rutherglen@gmail.com>
To: hdfs-user@hadoop.apache.org
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Right and AN is not using ZK for the actual NameNode
methods/functions, only for the failover election of the 'backup'
NameNode?

On Sun, Apr 24, 2011 at 4:06 AM, Ozcan ILIKHAN <ilikhan@cs.wisc.edu> wrote:
> I have read =A0Dhruba's blog entry about AvatarNode long ago. If I am not
> wrong initially it was not using ZooKeeper. That is way I raised that
> question. Also, AvatorNode is build on HDFS 0.20 but my intension is to
> utilize BackupNode that comes with HDFS 0.21
>
> Thanks,
> Ozcan.
>
> -----Original Message----- From: Jason Rutherglen
> Sent: Saturday, April 23, 2011 1:17 PM
> To: hdfs-user@hadoop.apache.org
> Subject: Re: HDFS + ZooKeeper
>
> This is an interesting question. =A0AvatarNode doesn't use Zookeeper?
> Is there a drawback to implementing ZK for the NameNode other than the
> potential bugs from a newly engineered feature?
>
> Perhaps this issue is the main one for implementing the NameNode in
> ZK? =A0HDFS-1623
>
> On Fri, Apr 22, 2011 at 10:41 PM, Jean-Daniel Cryans
> <jdcryans@apache.org> wrote:
>>
>> This is a 1M$ question. You could start thinking about this problem by
>> looking at what "AvatarNode" does:
>> https://issues.apache.org/jira/browse/HDFS-976
>>
>> J-D
>>
>> On Fri, Apr 22, 2011 at 10:17 PM, Ozcan ILIKHAN <ilikhan@cs.wisc.edu>
>> wrote:
>>>
>>> Hi,
>>> Does anyone have any idea about how we can use HDFS with ZooKeeper? Mor=
e
>>> elaborately if NameNode fails DataNodes should be able to retrieve
>>> address
>>> of new NameNode from ZooKeeper.
>>>
>>> Thanks,
>>> ---------------------------------
>>> Ozcan ILIKHAN
>>> PhD Student, Graduate Research Assistant
>>> Department of Computer Sciences
>>> University of Wisconsin-Madison
>>> http://pages.cs.wisc.edu/~ilikhan
>>>
>>
>
>