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HDFS >> mail # user >> Migration needed when updating within an Hadoop release

Schad, Bjoern-Bernhard 2013-06-14, 10:00
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Re: Migration needed when updating within an Hadoop release
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
Alexander Alten-Lorenz 2013-06-14, 10:12
Schad, Bjoern-Bernhard 2013-06-14, 11:13
Alexander Alten-Lorenz 2013-06-14, 11:23