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From Andrej <and...@bsdaemon.hu>
Subject Re: High Availability hadoop cluster.
Date Thu, 06 Nov 2014 08:50:22 GMT
JN is the journalnode. You have to use it for HA. Like zookeeper, you 
need odd numbers of JN.
Anyway ZKFC is neccessary too for automatic failover.


On 2014.11.06. 9:45, Oleg Ruchovets wrote:
> Our deployment is 15 data nodes and 2 NN. ZKs installed also as part 
> of hortonworks distributions.
> Sorry for dummy question - what is JN is?
> Can you please please point me on some manual wiki for installation / 
> configuration.
>
> Thanks
> Oleg.
>
>
> On Thu, Nov 6, 2014 at 4:04 PM, Alexander Pivovarov 
> <apivovarov@gmail.com <mailto:apivovarov@gmail.com>> wrote:
>
>     2 boxes for 2 NNs  (better dedicated boxes)
>     min 3 JNs
>     min 3 ZKs
>
>     JNs and ZKs can share boxes with other services
>
>
>     On Wed, Nov 5, 2014 at 11:31 PM, Oleg Ruchovets
>     <oruchovets@gmail.com <mailto:oruchovets@gmail.com>> wrote:
>
>         Hello.
>         We are using hortonwork distribution and want to evaluate HA
>         capabilities.
>         Can community please share the best practices and potential
>         problems?
>         Is it required additional hardware?
>
>         Thanks
>         Oleg.
>
>
>


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