Pig
UDF
Map Reduce
When you do join in Hive, what's going on behind the scene.
Redis
1. What is Kafka:
Scala based distributed messaging system .
2. What is Cassandra:
A distributed NOSQL database(Key-Value Document-based), it doesn't support MapReduce
3. What is Redis:
In memory data structure store. Let's say you have 400TB data and you want to access them very fast
in a local variable. you want to use Redis.
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