-RE: Migration needed when updating within an Hadoop release
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,
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From: ext Alexander Alten-Lorenz [mailto:[EMAIL PROTECTED]]
Sent: Friday, June 14, 2013 12:12 PM
To: [EMAIL PROTECTED] [EMAIL PROTECTED]
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 <[EMAIL PROTECTED]> 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:
> Alexander Alten-Lorenz
> German Hadoop LinkedIn Group: http://goo.gl/N8pCF
German Hadoop LinkedIn Group: http://goo.gl/N8pCF