Cloudera Certified Administrator for Apache Hadoop CDH4 : CCA-410認證

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最新的 CCAH CCA-410 免費考試真題:

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

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

2. In HDFS, you view a file with rw-r--r-- set as its permissions. What does this tell you about the file?

A) As a Filesystem in Userspace (FUSE), HDFS files are available to all user's on a cluster regardless of their underlying POSIX permissions.
B) The file cannot be deleted by anyone but the owner
C) The file cannot be deleted by anyone
D) The file's contents can be modified by the owner, but no-one else
E) The file cannot be run as a MapReduce job

3. You configure your hadoop development cluster with both mapreduce frameworks, mapreduceV1 (MRv1) and mapreduce v2 (MRv2/YARN). You plan to run only one set of mapreduce daemons at a time in this development environment (running both simultaneously results in an unsuitable cluster but configure in both moving between them is fine). Which two mapreduce (capitation) daemons do you need to configure to run on your masternodes?

A) Jobtracker
B) Containermanager
C) Applicationmaster
D) Resourcemanager
E) Nodemanager
F) Journalnode

4. You have a cluster running 32 slave nodes and 3 master nodes running mapreduce V1 (MRv1). You execute the command:
$ hadoop fsck /
What four cluster conditions running this command will return to you?

A) the location for every block
B) Blocks replicated improperly or that don't satisfy your cluster enhancement policy (e. g. , too many blocks replicated on the same node)
C) Configure capacity of your cluster
D) Number of datanodes
E) Number of dead datanodes
F) The current state of the file system returned from scanning individual blocks on each datanode
G) the current state of the file system according to the namenode
H) Under-replicated blocks

5. 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) Any machine running the DataNode daemon can immediately join the cluster.
B) Presented with a blank dfs.hosts property, the NameNode will permit DataNodes specified in mapred.hosts to join the cluster.
C) The NameNode will update dfs.hosts property to include machines running the DataNode daemon on the next NameNode reboot or with a dfsadmin -refreshNodes.
D) No new can be added to the cluster until you specify them in the dfs.hosts file.

問題與答案：