What is data replication in Hadoop?

Related questions

1. What is the difference between NameNode and DataNode in Hadoop?
2. What is difference between hive and SQL?
3. What is the difference between NAS and DAS in Hadoop cluster?
4. What is the default input format in Hadoop?
5. Is hive a Hdfs?
6. Is general purpose computing model and runtime?
7. Why block size in HDFS is large?
8. What is MAP reduce function?
9. Which files deal with small file problems?
10. Why is replication done in HDFS?

Tags

1. #stores
2. #designed
3. #heartbeat
4. #across
5. #cluster
6. #receives
7. #files
8. #except
9. #blockreport
10. #periodically
11. #replication
12. #datanodes
13. #machines
14. #reliably
15. #sequence
16. #large
17. #blocks
18. #block
19. #store