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Subject: Re: Recover dfs/name
From: Ted Xu <txu@gopivotal.com>
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Hi Han,

HDFS metadata cannot be fully reconstructed by datanode report.

If you have deployed a checkpoint node/secondary namenode, you can copy the
metadata to namenode and restart. This could recover most of the metadata.


On Wed, Jun 5, 2013 at 5:30 PM, Han JU <ju.han.felix@gmail.com> wrote:

> Hi,
>
> The folder /tmp/hadoop-user/dfs/name is accidentally deleted by a
> colleague (along with all other things in this directory), is there any
> means to recover this directory?
> I know the directory where dfs is located in every datanode. Can I
> reconstruct the deleted files without formatting the hdfs?
>
> Thanks!
>
> --
> *JU Han*
>
> Software Engineer Intern @ KXEN Inc.
> UTC   -  Universit=E9 de Technologie de Compi=E8gne
> *     **GI06 - Fouille de Donn=E9es et D=E9cisionnel*
>
> +33 0619608888
>



--=20
Regards,
Ted Xu

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<div dir=3D"ltr">Hi Han,<div><br></div><div style>HDFS metadata cannot be f=
ully reconstructed by datanode report.=A0</div><div style><br></div><div st=
yle>If you have deployed a checkpoint node/secondary namenode, you can copy=
 the metadata to namenode and restart. This could recover most of the metad=
ata.=A0</div>
</div><div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Wed,=
 Jun 5, 2013 at 5:30 PM, Han JU <span dir=3D"ltr">&lt;<a href=3D"mailto:ju.=
han.felix@gmail.com" target=3D"_blank">ju.han.felix@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">Hi,<div><br></div><div>The =
folder /tmp/hadoop-user/dfs/name is accidentally deleted by a colleague (al=
ong with all other things in this directory), is there any means to recover=
 this directory?</div>
<div>
I know the directory where dfs is located in every datanode. Can I reconstr=
uct the deleted files without formatting the hdfs?</div><div><br></div><div=
>Thanks!=A0</div><span class=3D"HOEnZb"><font color=3D"#888888"><div><div><=
br>
</div>-- <br><div dir=3D"ltr"><font face=3D"verdana, sans-serif"><b>JU Han<=
/b></font><div>
<br></div><div><div><div><div><div><div><font face=3D"verdana, sans-serif">=
Software Engineer Intern @ KXEN Inc.</font></div></div><div><div><div><span=
 style=3D"font-size:13px">UTC=A0=A0 - =A0<font face=3D"verdana, sans-serif"=
>Universit=E9 de Technologie de Compi=E8gne</font></span></div>

</div></div><div><div><div><div><i>=A0=A0=A0=A0 </i><i><i style=3D"font-fam=
ily:verdana,sans-serif">GI06 - Fouille de Donn=E9es et D=E9cisionnel</i></i=
></div></div></div></div></div><div><br></div><div><div><font face=3D"verda=
na, sans-serif"><a href=3D"tel:%2B33%200619608888" value=3D"+33619608888" t=
arget=3D"_blank">+33 0619608888</a></font></div>

</div></div></div></div></div>
</div></font></span></div>
</blockquote></div><br><br clear=3D"all"><div><br></div>-- <br><div dir=3D"=
ltr">Regards,<div><div>Ted Xu</div></div></div>
</div>

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