HDFS

Class

Canvas Discussion blockchain

Install Hadoop

commands:

hdfs dfs -ds/

Hadoop Distributed File System

MapReduce

map()---(key, value) function

each group has the same key

Links

https://www.cnblogs.com/caiyisen/p/7395843.html

https://hadoop.apache.org/docs/r1.2.1/mapred_tutorial.html