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Cloudera CCA-470 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Security & Data Management | 15% | - Security enhancements in CDH4 - HDFS optimization and maintenance - Data ingestion with Flume and Sqoop |
| Installation & Configuration | 25% | - Cloudera Manager integration and configuration - Upgrading clusters from CDH3 to CDH4 - Configuring core services in CDH4 |
| Cluster Maintenance & Upgrades | 10% | - Performing rolling upgrades - Backup and recovery procedures |
| CDH4 Architecture & New Features | 25% | - YARN architecture and resource management - MapReduce v2 vs MapReduce v1 differences - HDFS high availability enhancements |
| Cluster Administration & Operations | 25% | - Managing resources with YARN schedulers - Monitoring CDH4 clusters and services - Troubleshooting common CDH4 issues |
Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) Sample Questions:
You configure you cluster with HDFS High Availability (HA) using Quorum-Based storage. You do not implement HDFS Federation.
What is the maximum number of NameNodes daemon you should run on you cluster in order to avoid a "split-brain" scenario with your NameNodes?
- A. Unlimited. HDFS High Availability (HA) is designed to overcome limitations on the number of NameNodes you can deploy.
- B. Two active NameNodes and one Standby NameNode
- C. Two active NameNodes and two Standby NameNodes
- D. One active NameNode and one Standby NameNode
Correct Answer: D 🗳️
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On a cluster running MapReduce v1 (MRv1), the value of the mapred.tasktracker.map.tasks.maximum configuration parameter in the mapred-site.xml file should be set to:
- A. Half the number of the maximum number of Reduce tasks which can run on the cluster as a whole.
- B. Half the number of the maximum number of Reduce tasks which can run simultaneously on an individual node.
- C. The maximum number of Map tasks which can run on the cluster as a whole.
- D. The maximum number of Map tasks can run simultaneously on an individual node.
- E. The same value on each slave node.
Correct Answer: D 🗳️
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Your cluster is running Map v1 (MRv1), with default replication set to 3, and a cluster blocks 64MB. Identify which best describes the file read process when a Client application connects into the cluster and requests a 50MB file?
- A. The client queries the NameNode and then retrieves the block from the nearest DataNode to the client and then passes that block back to the client.
- B. The client queries the NameNode for the locations of the block, and reads from a random location in the list it receives to eliminate network I/O loads by balancing which nodes it retrieves data from at any given time.
- C. The client queries the NameNode for the locations of the block, and reads all three copies. The first copy to complete transfer to the client is the one the client reads as part of Hadoop's execution framework.
- D. The client queries the NameNode for the locations of the block, and reads from the first location in the list of receives.
Correct Answer: A 🗳️
You are planning a Hadoop duster, and you expect to be receiving just under 1TB of data per week which will be stored on the cluster, using Hadoop's default replication. You decide that your slave nodes will be configured with 4 x 1TB disks.
Calculate how many slave nodes you need to deploy at a minimum to store one year's worth of data.
- A. 10 slave nodes
- B. 50 slave nodes
- C. 100 slave nodes
- D. 100 slave nodes
Correct Answer: B 🗳️
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Identify the function performed by the Secondary NameNode daemon on a cluster configured to run with a single NameNode.
- A. In this configuration, the Secondary NameNode is standby NameNode, ready to failover and provide high availability.
- B. In this configuration, the Secondary NameNode performs a checkpoint operation on the files by the NameNode.
- C. In this configuration, the Secondary NameNode servers as alternate data channel for clients to reach HDFS, should the NameNode become too busy.
- D. In this configuration, the Secondary NameNode performs deal-time backups of the NameNode.
Correct Answer: B 🗳️
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