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Cloudera CCA-470 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Upgrade and Migration (CDH4 focus) | - Upgrading CDH components - Compatibility and migration considerations |
| Topic 2: MapReduce and Job Management | - Job execution and scheduling - Troubleshooting failed jobs |
| Topic 3: Hadoop and CDH Architecture | - CDH4 architecture overview and services - Hadoop ecosystem components (HDFS, MapReduce) |
| Topic 4: Cluster Maintenance and Monitoring | - Log analysis and debugging - Monitoring cluster health and performance |
| Topic 5: Cluster Installation and Configuration | - Installing and configuring CDH4 components - Cluster setup and node management |
| Topic 6: HDFS Administration | - NameNode and DataNode management - HDFS architecture and data replication |
Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) Sample Questions:
Which two features does Kerberos security add to a Hadoop cluster?
- A. Encryption for data on disk ("at rest")
- B. Encryption on all remote procedure calls (RPCs)
- C. User authentication on all remote procedure calls (RPcs)
- D. Root access to the cluster for users hdfs and mapred but non-root acess clients
- E. Authentication for user access to the cluster against a central server
Correct Answer: B,C 🗳️
Choose three reasons why should you run the HDFS balancer periodically?
- A. To improve data locality for MapReduce tasks.
- B. To ensure that all blocks in the cluster are 128MB in size.
- C. To ensure that there is consistent disk utilization across the DataNodes.
- D. To ensure that there is capacity in HDFS tor additional data.
- E. To help HDFS deliver consistent performance under heavy loads.
Correct Answer: A,C,E 🗳️
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Someone in your data center unplugs a slave node by accident. Users of the cluster notice via the Hadoop Web UI that the cluster size has shrunken and express concerns about data loss and HDFS performance. The replication factor of all the files in the cluster is unchanged from the default of 3. What can you tell the users?
- A. After identifying the outage, the NameNode will naturally re-replicate the data and there will be no data loss. The administrator can re-add the DataNode at any time. The client can disregard warnings concerned with this event. Data will be under-replicated but will become properly replicated over time.
- B. The HDFS filesystem is corrupt until the administrator re adds the DataNode to the cluster. The warnings associated with the event should be reported.
- C. The NameNode will re replicate the data after the administrator issues a special command. The data is not lost but is underreplicated until the administrator issues this command.
- D. The NameNode will identify the outage and re-replicate the data when the clients receive connection failures to the DataNode, so the end users can disregard such warnings.
Correct Answer: A 🗳️
Which of the following statements arc accurate in describing features of Hadoop rack awareness? (Choose 2)
- A. HDFS is rack aware but MapReduce daemons are not.
- B. Hadoop gives preference to intra-rack data transfer In order to conserve bandwidth.
- C. Even for small clusters on a single rack, configuring rack awareness will improve performance.
- D. Configuration of rack awareness is accomplished using a configuration file. You cannot use a rack topology script.
- E. Rack location is considered in the HDFS block placement policy.
Correct Answer: B,E 🗳️
The most important consideration for slave nodes in a Hadoop cluster running production jobs that require short turnaround times is:
- A. The ratio between the amount of memory and the number of disk drives.
- B. The ratio between the number of processor cores and number of disk drives.
- C. The ratio between the number of processor cores and the amount of memory.
- D. The ratio between the number of processor cores and total storage capacity.
- E. The ratio between the amount of memory and the total storage capacity.
Correct Answer: D 🗳️
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