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From oc tsdb <oc.t...@gmail.com>
Subject Re: Standby Namenode and Datanode coexistence
Date Fri, 10 Oct 2014 04:36:08 GMT
Thank you.We understood.

Thanks
oc.tsdb

On Thu, Oct 9, 2014 at 11:22 PM, SF Hadoop <sfhadoop@gmail.com> wrote:

> You can run any of the daemons on any machine you want, you just have to
> be aware of the trade offs you are making with RAM allocation.
>
> I am hoping this is a DEV cluster.  This is definitely not a configuration
> you would want to use in production.  If you are asking in regards to a
> production cluster, the NNs should live apart from the datanodes though it
> is perfectly fine to run the journal node and zookeeper instances on the
> NNs.  But again, you should NEVER have the NN and DN on the same machine
> (unless you are in a DEV cluster and experimenting).
>
>
> On Thu, Oct 9, 2014 at 4:19 AM, oc tsdb <oc.tsdb@gmail.com> wrote:
>
>> Hi,
>>
>> We have cluster with 3 nodes (1 namenode + 2 datanodes).
>> Cluster is running with hadoop 2.4.0 version.
>>
>> We would like to add High Availability(HA) to Namenode using the Quorum
>> Journal Manager.
>>
>> As per the below link, we need two NN machines with same configuration.
>>
>>
>> http://hadoop.apache.org/docs/r2.4.0/hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithQJM.html#Hardware
>> resources
>>
>> Our query is:
>>
>> As we have existing cluster with 3 nodes (1 namenode + 2 datanodes), can
>> we configure standby namenode on one of the datanodes? Will there be any
>> issues if we run standby namenode and datanode together?
>> Or we should add one more machine and configure it as standby namenode?
>>
>> Regarding Journal node, Can we run it on any machine (datanode and
>> namenode)?
>>
>> Thanks in advance.
>>
>> Thanks
>> oc.tsdb
>>
>>
>>
>>
>

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