Tracking JobTracker and TaskTracker in Hadoop 1
Distributed Processing with Hadoop MapReduce
Hadoop as a Data Preprocessing Engine

3 Hadoop Cluster Configurations

Three-rack Hadoop deployment

A medium-size cluster has multiple racks, where the three master nodes are distributed across the racks.

Hadoop’s resiliency is starting to become apparent: Even if an entire rack were to fail (for example, both ToR switches in a single rack), the cluster would still function, albeit at a lower level of performance. A slave node failure would barely be noticeable.

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