replica placement in hadoop


Rack Awareness in Hadoop 4

Usually Hadoop clusters of more than 30-40 nodes are configured in multiple racks.¬†Communication between two data nodes on the same rack is efficient than the same between two nodes on different racks. In large clusters of Hadoop, in order to improve network traffic while reading/writing HDFS files, NameNode chooses data nodes which are on the same rack or a near by rack to read/write request (client node). NameNode achieves this […]


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Dharmeswaran ETL / Hadoop Developer Spark Nov 2016 September 21, 2017

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