A.hdfs fsck /test.txt -locations

B.hdfs fsck /test.txt -blocks

C.hdfs fsck /test.txt -files

D.hdfs fsck /test.txt -list -corruptfileblocks

A.After Nimbus fails, the standby Nimbus will automatically take over, without affecting the running business.

B.After the Supervisor process exits, it can be automatically recognized and pulled up by Nimbus without affecting the running business.

C.Worker can be automatically pulled up by Supervisor after abnormal exit without manual intervention.

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

A.Search

B.Data transfer

C.Storage

D.Resource management

A.Iines.fIatMap(_.spIit (" " )).map(word => (word, 1)).reduceByKey(_ +_).print()

B.Iines.flatMap(_.split (" " )).map(word => (word, 1)).reduce(_ +_).print()

C.Iines.flatMap(_.split (" " )).map(word => (word,word.Iength())).reduceByKey (_ +_).print()

D.Iines.flatMap(_.split (" " )).flatMap(word => (word, 1)).groupByKey(_ +_).print()

A.The start command can make the job in the PREP state become RUNNING

B.The kill command can be used on jobs in PREP/SUSPEND/RUNNING status

C.The run command can make the job status RUNNING

D.The submit command can change the status of the job to PREP