A.The message can be quickly located through the index information

B.Map all the index metadata to memory, which can avoid the IO disk operation of the index data of the sementfile

C.The index file is stored sparsely, which can greatly reduce the space occupied by the metadata of the index file

D.Sparse storage, that is, the original complete data, only select multiple pieces at intervals for storage

A.scalable

B.high performance

C.Column-oriented

D.High reliability

A.The MetaStore instance is unavailable

B.HDFS service is unavailable

C.The HBase service is unavailable

D.DBService is unavailable

A.Source

B.Sink

C.Topic

D.Channel

A.HMaster

B.Meta table

C.Zookeeper

D.Root table