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Hadoop 2.x Administration Cookbook by Gurmukh Singh

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Adding nodes to the cluster

Over a period of time, our cluster will grow in data and there will be a need to increase the capacity of the cluster by adding more nodes.

We can add Datanodes to the cluster in the same way that we first configured the Datanode started the Datanode daemon on it. But the important thing to keep in mind is that all nodes can be part of the cluster. It should not be that anyone can just start a Datanode daemon on his laptop and join the cluster, as it will be disastrous. By default, there is nothing preventing any node being a Datanode, as the user has just to untar the Hadoop package and point the file "core-site.xml" to the Namenode and start the Datanode daemon.

Getting ready

For the following steps, we assume that the ...

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