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Hadoop > Learn Hadoop > How many nodes does a Hadoop cluster have?
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How many nodes does a Hadoop cluster have?

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A common rule of thumb for determining the number of nodes in a Hadoop cluster is to have no more than 20 nodes per namenode. This means that if you have one namenode, you should aim for a cluster size of no more than 20 nodes. If you have two namenodes, you can have up to 40 nodes in the cluster
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