A.No source directory or file specified

B.Does not comply with data conversion rules

C.Job execution takes too long

D.No data compression format specified

A.technological advancements of competitors.

B.Scattered data has problems such as noise, missing, and non-standard storage types, which requires a lot of data preprocessing.

C.Diversified data structures.

D.Data is scattered among various departments of the enterprise, and the same data is stored in different formats within each department.

A.Shuffle is not a necessary process in Spark tasks

B.Spark can cache intermediate results in memory reducing disk I0

C.Intermediate results of Spark tasks can only be stored in memory

D.Shuffle is a necessary process in Spark tasks

A.DataNode

B.Zookeeper

C.RegionServer

D.HMaster

A.False

B.True