Hello Anfernee, Actually this not data migrations !! . It is upgrade. If you have to cluster older one 0.21.0 with data and another one 2.2.0 is new. Then if want to copy data from older to newer then it is data migration, i doesn't require any extra care just copy data. if want change in the same old cluster then you have to follow upgrade steps please refer these: http://wiki.apache.org/hadoop/Hadoop_Upgrade The Hadoop definitive guide - Tom white 3rd edition page -360 http://hortonworks.com/blog/running-existing-applications-on-hadoop-2-yarn/
On Wed, Feb 19, 2014 at 4:30 AM, Anfernee Xu <[email protected]> wrote: > Hi, > > I have an existing Hadoop cluster built from 0.21.0 release and have some > important data on HDFS, now I'm planning to move to the current GA > release(2.2.0), what's the procedure for the data migration(from 0.21.0 > hdfs to 2,20 hdfs) if topology is not changed(all nodes are not changed)? > Can I simply copy all meta data files from 0.21.0(say > /hadoop_021/temp/hdfs/namenode/) to 2.2.0(say > /hadoop-220/temp/hdfs/namenode). > > Thanks > > -- > --Anfernee > -- Regards, ...sudhakara
