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We are using hadoop-2.0.0-cdh4.0.0 and we start namenode using hadoop namenode, how do I start the hadoop processes in either 0.20 mode or 0.23 mode?
You’ll need to install and configure these version of hadoop if you want to use them – there is no ‘switch’ to allow 2.0.0 (or any other hadoop version) to run in a lower version / mode.