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From Keith Turner <ke...@deenlo.com>
Subject Re: Accumulo 1.6.0 HA namenode testing
Date Wed, 18 Dec 2013 05:00:21 GMT
On Tue, Dec 17, 2013 at 11:52 PM, Sean Busbey <busbey+ml@clouderagovt.com>wrote:

> On Tue, Dec 17, 2013 at 10:44 PM, Keith Turner <keith@deenlo.com> wrote:
>
> > On Tue, Dec 17, 2013 at 11:39 PM, Josh Elser <josh.elser@gmail.com>
> wrote:
> >
> >
> > I was not using the correct terminology for what I was thinking, but I am
> > not sure what the correct terminology is.  I do not want to be limited by
> > the memory of one machine for hdfs metadata and I want HA.  So would it
> be
> > correct to say that I want to test with multiple HA nameservices?   For
> > example test 1.6 w/ three nameservices, where each nameservice has two HA
> > namenodes.   This would allow hdfs metadata to spread across the memory
> of
> > three machines.
> >
> >
> These HDFS nameservices are independent HDFS instances using the new
> span-HDFS-instances feature in Accumulo 1.6? Or they are nameservices using
> HDFS federation across HA pairs?
>

HDFS federation across HA pairs, describes what I am thinking.   I did want
the HA pairs to share datanodes as Ravi mentioned.  So I would like to test
w/ 2 or more federated HA pairs.


>
> If the former, I think the terminology would be "spanning HDFS clusters."
>
> If the latter, it's HDFS federation[1].
>
> [1]:
>
> http://hadoop.apache.org/docs/r2.2.0/hadoop-project-dist/hadoop-hdfs/Federation.html
>
>
> --
> Sean
>

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