Michael Noll has a good description of the upgrade process here: http://www.michael-noll.com/blog/2011/08/23/performing-an-hdfs-upgrade-of-an-hadoop-cluster/
If may not quite reflect the versions of Hadoop you plan to upgrade but it has some good pointers. Chris On 30 May 2012 09:12, <ramon....@accenture.com> wrote: > Hi, > > I did this upgrade on a similar cluster some weeks ago. I use the > following method (all commands run with hadoop demons process owner): > > * Stop cluster. > * Start only HDFS with : start-dfs.sh -upgrade > * At this point the migration has started. > * You can check the status with hadoop dfsadmin -upgradeProgress > status > * Now you can access files for reading. > * If you find any issue can rollback migration with : start-dfs.sh > -rollback > * If everything seems ok you can mark the upgrade as finalized: > hadoop dfsadmin -finalizeUpgrade > > > -----Original Message----- > From: Eli Finkelshteyn [mailto:iefin...@gmail.com] > Sent: martes, 29 de mayo de 2012 20:29 > To: common-user@hadoop.apache.org > Subject: Best Practices for Upgrading Hadoop Version? > > Hi, > I'd like to upgrade my Hadoop cluster from version 0.20.2-CDH3B4 to 1.0.3. > I'm running a pretty small cluster of just 4 nodes, and it's not really > being used by too many people at the moment, so I'm OK if things get dirty > or it goes offline for a bit. I was looking at the tutorial at > wiki.apache.org <http://wiki.apache.org/hadoop/Hadoop_Upgrade>, but it > seems either outdated, or missing information. Namely, from what I've > noticed so far, it doesn't specify what user any of the commands should be > run as. Since I'm sure this is something a lot of people have needed to do, > Is there a better tutorial somewhere for updating Hadoop version in general? > > Eli > > ________________________________ > Subject to local law, communications with Accenture and its affiliates > including telephone calls and emails (including content), may be monitored > by our systems for the purposes of security and the assessment of internal > compliance with Accenture policy. > > ______________________________________________________________________________________ > > www.accenture.com > >
