A.HBase service is unavailable

B.HDFS service is unavailable

C.DBService is unavailable

D.MetaStore instance is unavailable

A.If it is the other copy fails to read except the first copy, try to write to the storage type specified in "Alternative Storage Policy for Copy"

B.All 4 blocks will be written to RAM_DISK

C.If the first copy of the block fails to write to RAM_DISK, try to write to the storage type specified by the "alternative storage strategy"

D.The first copy of the block will be written into RAM_DISK, and the remaining copies will be written into DISK

A.False

B.True

A.get /node

B.ls/node

C.set/node data

D.create /node

A.Data source query

B.View job status

C.Stop the job

D.Start the job