A.User-defined UDF can add deterministic and statefull annotations according to the actual situation.

B.In a secure cluster, user-defined UDFs are recommended to be created before each use.

C.User-defined UDF is not allowed to add information such as summary and status.

D.Before the user-defined UDF is used, it needs to be created in the Hive system.

A.Both can provide SQL or SQL-like capabilities externally

B.Both can run on the MapReduce computing framework

C.Both can access data on HBase through the table field and HBase field mapping method

D.Both can run on the Spark computing framework

A.If the client and the connected DataNode fail during reading, the client will abandon the failed node and connect to the node where the other replica is located.

B.The file data is first returned from the DataNode to the NameNode, and then sent from the NameNode to the client.

C.Support multiple clients to read the same file data from the DataNode at the same time.

D.Download data from the nearest DataNode first.

A.HBASE

B.DB

C.HIVE

D.HDFS

A.3

B.2

C.1

D.4