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From: Harsh J <harsh@cloudera.com>
Date: Wed, 22 May 2013 10:25:18 +0530
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 <CAOcnVr3yLN3MCcE8JgSokPJxpPUNiU+RXR8VbovyOm9e2KWprQ@mail.gmail.com>
Subject: Re: upgrade from primary + secondary NN to active + standby NN
To: "<user@hadoop.apache.org>" <user@hadoop.apache.org>
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FWIW, I've seen through a lot of upgrades from 1.x to 2.x and metadata
issue's never been a part of it. You should be able to safely upgrade and
then to configure HA. Note that you cannot directly upgrade into HA mode
yet, you have to upgrade to a regular 1.x to 2.x, and then as a next step,
enable HA.

Rollbacks are supported as long as you haven't finalized the metadata
upgrade. I hope this covers the "backward capable" metadata question. If
not, please rephrase that point?


On Wed, May 22, 2013 at 5:49 AM, Serge Blazhievsky <hadoop.ca@gmail.com>wrote:

> Hi guys,
>
> I am planning to upgrade to HA architecture and I am not sure if metadata
> is backward capable.
>
> Are there any problems that anybody is aware of?
>
> Thanks in advance.
> Serge
>


-- 
Harsh J

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<div dir=3D"ltr">FWIW, I&#39;ve seen through a lot of upgrades from 1.x to =
2.x and metadata issue&#39;s never been a part of it. You should be able to=
 safely upgrade and then to configure HA. Note that you cannot directly upg=
rade into HA mode yet, you have to upgrade to a regular 1.x to 2.x, and the=
n as a next step, enable HA.<div>

<br></div><div style>Rollbacks are supported as long as you haven&#39;t fin=
alized the metadata upgrade. I hope this covers the &quot;backward capable&=
quot; metadata question. If not, please rephrase that point?</div></div>

<div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Wed, May 2=
2, 2013 at 5:49 AM, Serge Blazhievsky <span dir=3D"ltr">&lt;<a href=3D"mail=
to:hadoop.ca@gmail.com" target=3D"_blank">hadoop.ca@gmail.com</a>&gt;</span=
> wrote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div><div><div><div>Hi guys=
,<br><br></div>I am planning to upgrade to HA architecture and I am not sur=
e if metadata is backward capable. <br>

<br></div>Are there any problems that anybody is aware of?<br><br>
</div>Thanks in advance. <br></div><span class=3D"HOEnZb"><font color=3D"#8=
88888">Serge <br></font></span></div>
</blockquote></div><br><br clear=3D"all"><div><br></div>-- <br>Harsh J
</div>

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