Hadoop Guru Presentation
Block Replication
Block Replication
Namenode (Filename, numReplicas, block-ids, …)
/users/sameerp/data/part-0, r:2, {1,3}, …
/users/sameerp/data/part-1, r:3, {2,4,5}, …
Datanodes
1
1
3
3
2
2
2
4
4
4
5
5
5