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From Manoj Samel <manojsamelt...@gmail.com>
Subject Re: Standby Namenode and Datanode coexistence
Date Thu, 09 Oct 2014 16:52:52 GMT
Quorum services like journal node (and zookeeper) need to have at least 3
instances running

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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