Which YARN daemon or service monitors a Controller’s per-application resource using (e.g., memory CPU)?

1. A. ApplicationMaster
2. B. NodeManager
3. C. ApplicationManagerService
4. D. ResourceManager

Correct Answer: A

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?(Choose two)

1. A. HMaster
2. B. ResourceManager
3. C. TaskManager
4. D. JobTracker
5. E. NameNode
6. F. DataNode

Correct Answer: BE

You have a Hadoop cluster HDFS, and a gateway machine external to the cluster from which clients submit jobs. What do you need to do in order to run Impala on the cluster and submit jobs from the command line of the gateway machine?

1. A. Install the impalad daemon statestored daemon, and daemon on each machine in the cluster, and the impala shell on your gateway machine
2. B. Install the impalad daemon, the statestored daemon, the catalogd daemon, and the impala shell on your gateway machine
3. C. Install the impalad daemon and the impala shell on your gateway machine, and the statestored daemon and catalogd daemon on one of the nodes in the cluster
4. D. Install the impalad daemon on each machine in the cluster, the statestored daemon and catalogd daemon on one machine in the cluster, and the impala shell on your gateway machine
5. E. Install the impalad daemon, statestored daemon, and catalogd daemon on each machine in the cluster and on the gateway node

Correct Answer: D

On a cluster running MapReduce v2 (MRv2) on YARN, a MapReduce job is given a directory of 10 plain text files as its input directory. Each file is made up of 3 HDFS blocks. How many Mappers will run?

1. A. We cannot say; the number of Mappers is determined by the ResourceManager
2. B. We cannot say; the number of Mappers is determined by the developer
3. C. 30
4. D. 3
5. E. 10
6. F. We cannot say; the number of mappers is determined by the ApplicationMaster

Correct Answer: E

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 a Hadoop cluster with seven DataNodes and on of your monitoring UIs displays the details shown in the exhibit.
What does the this tell you?

1. A. The DataNode JVM on one host is not active
2. B. Because your under-replicated blocks count matches the Live Nodes, one node is dead, and your DFS Used % equals 0%, you can’t be certain that your cluster has all the data you’ve written it.
3. C. Your cluster has lost all HDFS data which had bocks stored on the dead DatNode
4. D. The HDFS cluster is in safe mode

Correct Answer: A