Which of the following describe the functions of a scheduling algorithm? (Choose 4)
A. Allow multiple users to share clusters in a predictable, policy-guided manner.
B. Run jobs at periodic times of the day.
C. Allow short Jobs to complete even when large, long jobs (consuming a lot of resources) are running.
D. Reduce job latencies in an environment with multiple jobs of different sizes.
E. Support the implementation of service-level agreements for multiple cluster users.
F. Reduce the total amount of computation necessary to complete a job.
正解:A,B,D,F
質問 2:
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. Increase the value of dfs.number.of.nodes in hdfs-site.xml.
C. Add a new entry to /etc/slavenodes on the NameNode host.
D. add the new node's DNS name to the conf/slaves file on the master node.
E. Restart the NameNode daemon.
正解:D
解説: (Pass4Test メンバーにのみ表示されます)
質問 3:
You are running a Hadoop cluster with all monitoring facilities properly configured. Which scenario will go undetected?
A. MapReduce jobs that are causing excessive memory swaps.
B. A DataNode is disconnected from the cluster.
C. The NameNode goes down.
D. HDFS is almost full.
E. Map or reduce tasks that are stuck in an infinite loop.
正解:E
質問 4:
Your Hadoop cluster contains nodes in three racks. Choose which scenario results if you leave the dfs.hosts property in the NameNode's configuration file empty (blank)?
A. No new can be added to the cluster until you specify them in the dfs.hosts file.
B. The NameNode will update dfs.hosts property to include machines running the DataNode daemon on the next NameNode reboot or with a dfsadmin -refreshNodes.
C. Any machine running the DataNode daemon can immediately join the cluster.
D. Presented with a blank dfs.hosts property, the NameNode will permit DataNodes specified in mapred.hosts to join the cluster.
正解:A
解説: (Pass4Test メンバーにのみ表示されます)
質問 5:
You configure Hadoop cluster with both MapReduce frameworks, MapReduce v1 (MRv1) and MapReduce v2 (MRv2/YARN). Which two MapReduce (computational) daemons do you need to configure to run on your master nodes?
A. ApplicationMaster
B. JournalNode
C. ResourceManager
D. NodeManager
E. JobTracker
正解:A,C
解説: (Pass4Test メンバーにのみ表示されます)
質問 6:
You install Cloudera Manager on a cluster where each host has 1 GB of RAM. All of the services show their status as concerning. However, all jobs submitted complete without an error.
Why is Cloudera Manager showing the concerning status KM the services?
A. A slave node's disk ran out of space
B. The slave nodes are swapping.
C. DataNode service instance has crashed.
D. The slave nodes, haven't sent a heartbeat in 60 minutes
正解:D
解説: (Pass4Test メンバーにのみ表示されます)
質問 7:
A client wants to read a file from HDFS. How does the data get from the DataNodes to the client?
A. The application reads the blocks directly from the DataNodes.
B. The blocks are sent to a single DataNode, then the application reads the blocks from that Data Node.
C. The NameNode reads the blocks from the DataNodes, and caches them. Then, the application reads the blocks from the NameNode.
正解:A
解説: (Pass4Test メンバーにのみ表示されます)
質問 8:
Which two updates occur when a client application opens a stream to begin a file write on a cluster running MapReduce v1 (MRv1)?
A. The metadata in RAM on the NameNode is updated.
B. The metadata in RAM on the NameNode is flushed disk.
C. Once the write stream closes on the DataNode, the DataNode immediately initiates a black report to the NameNode.
D. The metadata in the RAM on the NameNode is flushed to disk.
E. The change is written to the NameNode disk.
F. The change is written to the edits file.
正解:B,F
解説: (Pass4Test メンバーにのみ表示されます)
诹访** -
とりあえずこれさえ取得すれば大丈夫です。一般的に通用します。
重要用語や問題傾向を掲載しているから気に入ってます。