cascading supports mutliple joins we can do this by using
CoGroup(pipes[],fieldnames[],DeclaredFields[],mixedjoin(boolean[]));
boolean is a set of arrays which indicate the whether the is innerjoin(true) or outerjoin(false).
سؤال
Cascading is one of the best framework to deal with hadood jobs by using simple data flows.
Has anyone tried and performed joins usings 3 tables in cascading, if so can u please share ur ideas regarding joins in cascading and how to perform join on 3 tables?.
المحلول
cascading supports mutliple joins we can do this by using
CoGroup(pipes[],fieldnames[],DeclaredFields[],mixedjoin(boolean[]));
boolean is a set of arrays which indicate the whether the is innerjoin(true) or outerjoin(false).