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Why does one remove or add nodes in a Hadoop cluster frequently?

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Why does one remove or add nodes in a Hadoop cluster frequently?

The most important features of the Hadoop is its utilization of Commodity hardware. However, this leads to frequent Datanode crashes in a Hadoop cluster.

Another striking feature of Hadoop is the ease of scale by the rapid growth in data volume.

Hence, due to above reasons, administrator Add/Remove DataNodes in a Hadoop Cluster.
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