0 votes
in Hadoop by
How does rack awareness work in HDFS?

1 Answer

0 votes
by

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.   

Related questions

0 votes
0 votes
asked Jun 8, 2020 in HDFS by Robindeniel
0 votes
asked Feb 17, 2023 in Hadoop by sharadyadav1986
...