I am trying to upgrade a Hadoop Cluster with 0.20.X and MRv1 to a hadoop Cluster with CDH412 with HA+QJM+YARN (aka Hadoop 2.0.3) without any data loss and minimal down time. The documentation on cloudera site iis OK, but very confusing. BTW I do not plan on using Cloudera manager. Has anyone attempted a clean upgrade using hadoop native commands?

Appreciate a quick reply.

Thanks,
-Dheeren

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