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Date: Mon, 7 Jan 2013 12:49:44 -0800
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Subject: Re: Can I switch the IP/host of NN without losing the filesystem?
From: Robert Molina <rmolina@hortonworks.com>
To: user@hadoop.apache.org
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Hi James,
This should be fine, but just wanted to add that you will need to also make
the change on your other nodes within the cluster, so they know how to
contact the filesystem.

Regards,
Robert

On Sun, Jan 6, 2013 at 12:18 AM, Jagat Singh <jagatsingh@gmail.com> wrote:

> Yes your data is safe.
>
>
>
>
> On Sun, Jan 6, 2013 at 6:41 PM, Jianhui Zhang <jhzhang.email@gmail.com>wrote:
>
>> Hadoop version: hadoop-0.20.205.0
>>
>> My NN machine has 2 IP addresses and 2 hostnames assigned to them
>> respectively. I have configured "fs.default.name" using one of the
>> hostnames and used the cluster for a while.
>>
>> Now, I may have to move the "fs.default.name" to the other IP/hostname
>> of the same machine. If no other configurations change (such as the
>> directories), can I simply change "fs.default.name" to the new hostname,
>> restart the NN and expect the same filesystem is intact?
>>
>> Thanks,
>> James
>>
>
>

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Hi James,=A0<div>This should be fine, but just wanted to add that you will =
need to also make the change on your other nodes within the cluster, so the=
y know how to contact the filesystem.=A0</div><div><br></div><div>Regards,=
=A0</div>
<div>Robert<br><br><div class=3D"gmail_quote">On Sun, Jan 6, 2013 at 12:18 =
AM, Jagat Singh <span dir=3D"ltr">&lt;<a href=3D"mailto:jagatsingh@gmail.co=
m" target=3D"_blank">jagatsingh@gmail.com</a>&gt;</span> wrote:<br><blockqu=
ote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc s=
olid;padding-left:1ex">
Yes your data is safe.<div class=3D"HOEnZb"><div class=3D"h5"><br><br><br><=
br><div class=3D"gmail_quote">On Sun, Jan 6, 2013 at 6:41 PM, Jianhui Zhang=
 <span dir=3D"ltr">&lt;<a href=3D"mailto:jhzhang.email@gmail.com" target=3D=
"_blank">jhzhang.email@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>Hadoop versi=
on: hadoop-0.20.205.0<br><br></div>My NN machine has 2 IP addresses and 2 h=
ostnames assigned to them respectively. I have configured &quot;<a href=3D"=
http://fs.default.name" target=3D"_blank">fs.default.name</a>&quot; using o=
ne of the hostnames and used the cluster for a while. <br>


<br></div>Now, I may have to move the &quot;<a href=3D"http://fs.default.na=
me" target=3D"_blank">fs.default.name</a>&quot;
 to the other IP/hostname of the same machine. If no other=20
configurations change (such as the directories), can I simply change &quot;=
<a href=3D"http://fs.default.name" target=3D"_blank">fs.default.name</a>&qu=
ot; to the new hostname, restart the NN and expect the same filesystem is i=
ntact? <br>


<br>Thanks,<br></div>James</div>
</blockquote></div><br>
</div></div></blockquote></div><br></div>

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