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From Jane Chen <Jane.C...@marklogic.com>
Subject RE: HDFS compatibility.
Date Sat, 15 Sep 2012 17:25:44 GMT
Thank you, Harsh!

-----Original Message-----
From: Harsh J [mailto:harsh@cloudera.com] 
Sent: Friday, September 14, 2012 7:00 PM
To: user@hadoop.apache.org
Subject: Re: HDFS compatibility.

Jane,

Yes with a regular upgrade, your data will be available, not lost.

For doing upgrades, see
http://hadoop.apache.org/docs/stable/hdfs_user_guide.html#Upgrade+and+Rollback

I recommend reading the process and text described in the section
"Upgrades" (under Maintenance), page 316 | Chapter 10: "Administering
Hadoop" of Tom White's 2nd Edition of Hadoop: The Definitive Guide.

HTH.

On Sat, Sep 15, 2012 at 4:21 AM, Jane Chen <jxchen_us_1999@yahoo.com> wrote:
>
> If I were to upgrade from 1.0 to 0.23.1 or 2.0, will my data stored on HDFS still be
accessible to the 2.0 system?  Is there any documented upgrade process available?
>
> Thanks,
> Jane




--
Harsh J

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