CCA-470 무료 덤프문제 온라인 액세스

Which scheduler would you deploy to ensure that your cluster allows short jobs to finish within a reasonable time without starving long-running jobs?

• A.Fair Scheduler
• B.FIFO Scheduler
• C.Capacity Scheduler
• D.Completely Fair Scheduler (CFS)

You have a cluster running with the Fair Scheduler enabled and configured. You submit multiple jobs to cluster. Each job is assigned to a pool. How are jobs scheduled? (Choose 2)

• A.Each pool gets 1/M of the total available task slots, where M is the number of nodes in the cluster
• B.Pools are assigned priorities. Pools with higher priorities are executed before pools with lower priorities.
• C.Each pool gets 1/N of the total available task slots, where N is the number of jobs running on the cluster.
• D.Pools get a dynamically-allocated share of the available task slots (subject to additional constraints).
• E.Each pool's share of task slots may change throughout the course of job execution.
• F.Each pool's share of task slots remains static within the execution of any individual job.

Cluster Summary
45 files and directories, 12 blocks = 57 total. Heap Size is 15.31 MB / 193.38MB(7%)

Refer to the above screenshot.
You configure the Hadoop cluster with seven DataNodes and the NameNode's web UI displays the details shown in the exhibit.
What does this tells you?

• A.One physical host crashed.
• B.Your cluster has lost all HDFS data which had blocks stored on the dead DataNode.
• C.The HDFS cluster is in the safe mode.
• D.The DataNode JVM on one host is not active.

What do you need to do when adding new slave nodes to a cluster?

• A.Halt and resubmit any running MapReduce jobs to guarantee correctness.
• B.Add a new entry to /etc/slavenodes on the NameNode host.
• C.add the new node's DNS name to the conf/slaves file on the master node.
• D.Restart the NameNode daemon.
• E.Increase the value of dfs.number.of.nodes in hdfs-site.xml.

Which of the following statements is the most accurate about the choice of operating systems to run on a Hadoop cluster?

• A.Linux is preferable to Windows and Solaris/OpenSolaris. Some Linux distributions are intended for cluster environments more than others.
• B.Linux is preferable to Windows and Solaris/OpenSolaris, but the choice of Linux distribution is unimportant when planning a Hadoop cluster.
• C.Linux and Solaris/OpenSolaris are preferable to Windows. Solaris running on SPARC hardware is the preferred Hadoop slave node configuration.
• D.The choice of operating system isn't very important for a Hadoop cluster.