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Hadoop upgrade

We are planning to upgrade our production hdfs cluster from 1.0.4 to 1.2.1

So if I directly upgrade the cluster, it won't affect the edits, fsimage
and checkpoints?

Also after upgrade is it will read the blocks, files from the data nodes

Is the version id conflict occurs with NN?

Do I need lose the data after upgrade?

Thanks in advance.

Appreciate your response.