hive architecture, construction, sql syntax, functions
Hive introduction and architecture design
Review 6 small cases of mapreduce: friend recommendation, secondary weather sorting, pagerank, wordcount.
For a group of the same key, the reduce end processes the same key. The idea of MR: divide and conquer.
Hive generation: non-java programmers do mapreduce operations on hdfs data.
The difference between database and data warehouse, what needs to be stored in the data warehouse?
Things in the data warehouse are not allowed to be modified or deleted.
HDFS puts plain text files; driver is a jvm process,
limit is to limit output, and paging is to limit output.
Hive construction mode and single node construction
Does hive store data? hive is stored in hdfs,