Cloudera CCA-500 問題集

質問 1：
Identify two features/issues that YARN is designated to address:
A. Ability to run framework other than MapReduce, such as MPI
B. Resource pressure on the JobTracker
C. HDFS latency
D. Standardize on a single MapReduce API
E. Reduce complexity of the MapReduce APIs
F. Single point of failure in the NameNode
正解：B,F
解説: (Topexam メンバーにのみ表示されます)

質問 2：
You are planning a Hadoop cluster and considering implementing 10 Gigabit Ethernet as the network fabric. Which
workloads benefit the most from faster network fabric?
A. When your workload generates a large amount of intermediate data, on the order of the input
data itself
B. When your workload generates a large amount of output data, significantly larger than the amount of intermediate
data
C. When your workload consumes a large amount of input data, relative to the entire capacity if HDFS
D. When your workload consists of processor-intensive tasks
正解：B

質問 3：
For each YARN job, the Hadoop framework generates task log file. Where are Hadoop task log files stored?
A. In HDFS, in the directory of the user who generates the job
B. Cached in the YARN container running the task, then copied into HDFS on job completion
C. Cached by the NodeManager managing the job containers, then written to a log directory on the NameNode
D. On the local disk of the slave mode running the task
正解：D

質問 4：
You are configuring your cluster to run HDFS and MapReducer v2 (MRv2) on YARN. Which two daemons needs to be installed on your cluster's master nodes?
A. NameNode
B. TaskManager
C. ResourceManager
D. DataNode
E. JobTracker
F. HMaster
正解：A,E

質問 5：
A slave node in your cluster has 4 TB hard drives installed (4 x 2TB). The DataNode is configured to store HDFS blocks
on all disks. You set the value of the dfs.datanode.du.reserved parameter to 100 GB. How does this alter HDFS block
storage?
A. 25GB on each hard drive may not be used to store HDFS blocks
B. 100GB on each hard drive may not be used to store HDFS blocks
C. All hard drives may be used to store HDFS blocks as long as at least 100 GB in total is available on the node
D. A maximum if 100 GB on each hard drive may be used to store HDFS blocks
正解：D

質問 6：
You decide to create a cluster which runs HDFS in High Availability mode with automatic failover, using Quorum
Storage. What is the purpose of ZooKeeper in such a configuration?
A. It monitors an NFS mount point and reports if the mount point disappears
B. It only keeps track of which NameNode is Active at any given time
C. It both keeps track of which NameNode is Active at any given time, and manages the Edits file. Which is a log of
changes to the HDFS filesystem
D. If only manages the Edits file, which is log of changes to the HDFS filesystem
E. Clients connect to ZooKeeper to determine which NameNode is Active
正解：B
解説: (Topexam メンバーにのみ表示されます)