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最新的 CCAH CCA-470 免費考試真題:

1. 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) 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) Any machine running the DataNode daemon can immediately join the cluster.

2. Which command does Hadoop offer to discover missing or corrupt HDFS data?

A) Fsck
B) Dskchk
C) Du
D) Hadoop does not provide any tools to discover missing or corrupt data; there is no need because three replicas are kept for each data block.
E) The map-only checksum utility,

3. 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) DataNode service instance has crashed.
C) The slave nodes are swapping.
D) The slave nodes, haven't sent a heartbeat in 60 minutes

4. What additional capability does Ganglia provide to monitor a Hadoop?

A) Ability to monitor the amount of free space on HDFS.
B) Ability to monitor number of files in HDFS.
C) Ability to monitor NameNode memory usage.
D) Ability to monitor processor utilization.
E) Ability to monitor free task slots.

5. What's the relationship between JobTrackers and TaskTrackers?

A) The JobTracker runs on a single master node and accepts MapReduce jobs from clients. A TaskTracker runs on every slave node and is responsible for managing actual map and reduce tasks.
B) The TaskTrackers runs on a single master node and accepts MapReduce jobs from clients. A JobTracker runs on every slave node and is responsible for managing map and reduce tasks.
C) The JobTracker runs on a single master node, but forks a separate instance of itself for every client MapReduce job. A TaskTracker runs on every slave node and is responsible for managing actual map and reduce tasks.
D) Every node in the cluster runs both a JobTracker and a TaskTracker. The JobTrackers manage jobs, and the TaskTrackers are responsible for managing actual map and reduce tasks.

問題與答案：