The combine of MapReduce in the Map phase is a pre-grouping process and is optional.

• A.True
• B.False

Comment: *

Name: *

Email: *

Verification: *

F1ink in( )interface for streaming data processing,( )interface for batch processing?

• A.Datastream API, DataSet API
• B.Batch API, Stream API
• C.Data batch API.DataStream API
• D.Stream API.Batch API

Comment: *

Name: *

Email: *

Verification: *

Which command in Redis is to view the remaining lifetime of a key?

• A.expireat
• B.expire
• C.persist
• D.ttl

Comment: *

Name: *

Email: *

Verification: *

In Fusioninsight HD, if you need to view the user and permission group currently logged in to HBase, what command can be executed in the HBase shell?

• A.get_user
• B.whoami
• C.who
• D.use_permission

Comment: *

Name: *

Email: *

Verification: *

What is the meaning of this command "ALTER TABLEemployee1ADDcolumns (columnlstring);" in Hive?

• A.Add columns
• B.Modify the file format
• C.Create a table
• D.Delete table

Comment: *

Name: *

Email: *

Verification: *