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Batch Processing

+ +
+ 
sudo cat /etc/shadow | cut -d ':' -f 2 | sort | uniq -c
+
+ +
+ +
+ +
+

Batch processing seria o caso de processar os dados de um dia.

+ +

Se novos dados entrassem no total do dia, bastaria reprocessar os dados do dia.

+ +

ou do mês, ou do ano.

+
+ +
+ + + +
+ +
+ Apache Spark Logo + Apache Hadoop Logo +
+ + +
+
+

Programação Funcional

+
+ +
+

Buzzwords!

+ + +
+ +
+ +
+ +
+

Funções Puras

+ +

Uma função é considerada pura se + ela sempre retorna o mesmo resultado para os mesmos + parâmetros.

+
+ +
+ 
def mult(a):
+    return a * 4
+
+ +
+ 
mult(2)
+ 8 + + 
mult(2)
+ 8 +
+ +
+ 
class LightSwitch:
+    def __init__(self):
+        self.state = False
+
+    def switch(self):
+        self.state = not self.state
+        print(self.state)
+
+ +
+ 
light = LightSwitch()
+light.switch()
+ True + + 
light.switch()
+ False +
+ +
+ 
print()
+ + + + 
INSERT INTO table (value, value)
+ + +
+ +
+

Imutabilidade

+ +

Uma vez que o dado é gerado, ele nunca muda.

+ +

(Transparência referencial)

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+ + + +
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+ +
+ +
+ +
+ +
+ +