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LoginWhat is Rack Awareness in HDFS?
Big Data Data Engineer Interview Questions in Big Data 3 years ago
In Hadoop, Rack awareness is the concept of choosing the DataNodes which are closer according to the rack information. By default, Hadoop ASSUMES that all the nodes belong to the same rack.
In order to improve the network TRAFFIC while reading/writing HDFS files that are on the same or a NEARBY rack, NameNode USES the DataNode to read/ write requests. To achieve rack information, the rack ids of each DataNode are MAINTAINED by HDFS NameNode. This concept in HDFS is known as Rack Awareness.
Posted on 31 May 2022, this text provides information on Big Data related to Data Engineer Interview Questions in Big Data. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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