CCA-410 試験問題を無料オンラインアクセス

Your cluster implements hdfs high availability (HA) your two namenodes are named hadoop01 and hadoop02. What occurs when you execute the command:
Sudo -u hdfs haadmin -failover hadoop01 hadoop02

• A.Hadoop02 is fenced, and hadoop01 becomes active namenode
• B.Hadoop01 becomes inactive and hadoop02 becomes the active namenode
• C.Hadoop01 is fenced, and hadoop02 becomes the active namenode
• D.Hadoop02 becomes the standby namenode and hadoop01 becomes the active namenode

On a cluster running MapReduce v1 (MRv1), a MapReduce job is given a directory of 10 plain text as its input directory. Each file is made up of 3 HDFS blocks. How many Mappers will run?

• A.30
• B.10
• C.We cannot say; the number of Mappers is determined by the developer
• D.1

For a MapReduce job, on a cluster running MapReduce v1 (MRv1), what's the relationship between tasks and task templates?

• A.There are always at most as many tasks attempts as there are tasks.
• B.There are always at least as many task attempts as there are tasks.
• C.The developer sets the number of task attempts on job submission.
• D.There are always exactly as many task attempts as there are tasks.

When requesting a file, how does HDFS retrieves the blocks associated with that file?

• A.the client polls the datanodes for the block ID's
• B.The namenode reads the block ID's from memory
• C.the namenode reads the block ID's from disk
• D.the namenode requires the datanode for the block ID's

For each job, the Hadoop framework generates task log files. Where are Hadoop's task log files stored?

• A.On the local disk of the slave node running the task.
• B.Cached on the local disk of the slave node running the task, then purged immediately upon task completion.
• C.Cached on the local disk of the slave node running the task, then copied into HDFS.
• D.In HDFS, in the directory of the user who generates the job.