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Storage Node Vs Compute Node

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Compute Node It's the computer or machine where you can execute actual business logic. It has two parameters RAM and CPU. Storage Node It's the computer or machine to store the processing data where your file system resides Generally, the compute and storage nodes you can find at one location. It designates block storage. Restrictions for Key and Value Class The key and value classes have to be serialized by the framework. To make them serializable Hadoop provides a Writable interface. As you know from the java itself that the key of the Map should be comparable, hence the key has to implement one more interface WritableComparable.