A.HMaster is a dual-master mode, no adjudication is required

B.Ruling by RegionServer

C.Random selection

D.Adjudication through Zookeeper

A.True

B.False

A.HBase

B.Hive

C.Loader

D.Spark

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.You can specify the node IP for log collection, for example, only download the logs of a certain IP.

B.You can specify the instance for log collection, for example, specify the log collection of metstore.

C.You can specify a time period for log collection, for example, only collect logs from 2016-1-1 to 2016-1-10.

D.Specific users can be designated for log collection, for example, only logs generated by UserA can be downloaded.