A.When the client initiates a scan request, it willscan cachingset too large

B.RegionofMemStoreset over threshold

C.RegionServerTotal memory exceeds threshold

D.Initiate by client-specified methodFlushdo

A.True

B.False

A.SupervisorAfter the process exits, it can beNimbusAutomatically identify and pull up without affecting running business.

B.When a node fails, the tasks on the node will be reassigned to other normal nodes without manual intervention.

C.NimbusAfter the failure, the backupNimbusIt will take over automatically without affecting the running business.

D.WorkerCan be used after abnormal exitSupervisorPulls up automatically without manual intervention.

A.Support multiple users to write to the same file at the same time.

B.The first copy of the data block is placed preferentially on the node where the client writing the data block is located.

C.eachDataNodemaximum storage1copies.

D.Copied file blocks all exist on the same rack by default.

A.val counts=textFile.flatMap(line=>line.split(" ")).map(word=>(word,1)).reduceByKey(_+_)

B.val counts=textFile.map(line=>line.split(" ")).map(word=>(word,1)).groupByKey()

C.val counts=textFile.flatmap(line=>line.split(" ")).map(-rd=>(word,1)).reduceByKey()

D.val counts=textFile.map(line=>line.split(" ')).map(-rd=>(word,1)).reduceByKey(_+_)