Oct 28, 2020 in Hadoop
Q: How does rack awareness work in HDFS?

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Oct 28, 2020

How does rack awareness work in HDFS?

HDFS Rack Awareness refers to the knowledge of different DataNodes and how it is distributed across the racks of a Hadoop Cluster.

rack-awareness

By default, each block of data is replicated three times on various DataNodes present on different racks. Two identical blocks cannot be placed on the same DataNode. When a cluster is “rack-aware,” all the replicas of a block cannot be placed on the same rack. If a DataNode crashes, you can retrieve the data block from different DataNodes.   

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