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From "Schad, Bjoern-Bernhard (EXT-Redknee - DE/Berlin)" <bjoern-bernhard.sc...@redknee.com>
Subject RE: Migration needed when updating within an Hadoop release
Date Fri, 14 Jun 2013 11:13:58 GMT
Hello Alexander,

thanks for your reply. This is very interesting for me indeed.

- But what about minor updates, e. g. from 1.0.1 to 1.0.4? Has this ever happened for such
updates?

Also I have got a similar question regarding HBase. I understand that HBase has its own datamodel
on top of/ within Hadoop. It could happen (e.g. between HBase major releases) that this datamodel
is changed/ extended/ ... 

- What about HBase minor releases in this context? Have data model changes/ conversions/ migrations
ever happened between minor releases?
- Is there a similar wiki page describing HBase upgrade?

Thank you very much,
Björn
 
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-----Original Message-----
From: ext Alexander Alten-Lorenz [mailto:wget.null@gmail.com] 
Sent: Friday, June 14, 2013 12:12 PM
To: user@hadoop.apache.org user@hadoop.apache.org
Subject: Re: Migration needed when updating within an Hadoop release

Excuse the typo, should be :
Normally, when you change the >major< release, you need to upgrade HDFS (http://hadoop.apache.org/docs/stable/hdfs_user_guide.html#Upgrade+and+Rollback).
This will happen when you switch major branches. 

On Jun 14, 2013, at 12:10 PM, Alexander Alten-Lorenz <wget.null@gmail.com> wrote:

> Hi Björn,
> 
>> has it ever happened that a migration of persistent data has been needed (or automatically
executed) when updating a Hadoop installation within a release? If so, where could I find
information regarding such needed migration?
> 
> Normally, when you change the minor release, you need to upgrade HDFS (http://hadoop.apache.org/docs/stable/hdfs_user_guide.html#Upgrade+and+Rollback).
This will happen when you switch major branches. 
> 
>> I would be interested because the runtime of such migration would probably depend
on the amount of managed data and had to be planned.
> Depends how much data you've stored. Michael has written a excellent blog post about:
> http://www.michael-noll.com/blog/2011/08/23/performing-an-hdfs-upgrade-of-an-hadoop-cluster/
> 
> Cheers,
> Alex
> 
> --
> Alexander Alten-Lorenz
> http://mapredit.blogspot.com
> German Hadoop LinkedIn Group: http://goo.gl/N8pCF
> 

--
Alexander Alten-Lorenz
http://mapredit.blogspot.com
German Hadoop LinkedIn Group: http://goo.gl/N8pCF




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