A.KeyBy is to group the source data according to the key to ensure that the metadata of the same key are divided into the same group

B.The Filter operation is to perform a Boolean function on each element

C.You can set the time window through the window

D.FlatMap can segment text

A.Extraction, transformation, output

B.Load, Transform, Export

C.Input Setup, Conversion, Output

D.Load, Transform, Extract

A.NameNode

B.Job Traoker

C.Data Node

D.ZooKeeper

A.2, N

B.3, N

C.N, N

D.2,2

A.VPN

B.Syslog

C.SNMP

D.BGP