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Cloudera CCA-470 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Security and Cluster Management | - Authentication and authorization
|
| Topic 2: Hadoop Cluster Architecture | - Cluster roles and services
|
| Topic 3: Cluster Installation and Upgrade (CDH4) | - Installation and configuration
|
| Topic 4: Hadoop Ecosystem Tools | - Data processing tools
|
| Topic 5: YARN and Resource Management | - Resource scheduling
|
| Topic 6: HDFS Administration | - Filesystem operations
|
Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) Sample Questions:
What determines the number of Reduces that run a given MapReduce job on a cluster running MapReduce v1 (MRv1)?
- A. It is set by the developer.
- B. It is set and fixed by the cluster administrator in mapred-site.xml. The number set always run for any submitted job.
- C. It is set by the Hadoop framework and is based on the number of InputSplits of the job.
- D. It is set by the JobTracker based on the amount of intermediate data.
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You've configured your cluster with HDFS Federation. One NameNode manages the /data namesapace and another Name/Node manages the /reports namespace. How do you configure a client machine to access both the /data and the /reports directories on the cluster?
- A. Configure the client to mount the /data namespace. As long as a single namespace is mounted and the client participates in the cluster, HDFS grants access to all files in the cluster to that client.
- B. You cannot configure a client to access both directories in the current implementation of HDFS Federation.
- C. Configure the client to mount both namespaces by specifying the appropriate properties in the core-site.xml
- D. You don't need to configure any parameters on the client machine. Access is controlled by the NameNodes managing the namespace.
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Your existing Hadoop cluster has 30 slave nodes, each of which has 4 x 2T hard drives. You plan to add another 10 nodes. How much disk space can your new nodes contain?
- A. The new nodes can contain any amount of disk space
- B. The new nodes must all contain 4 x 2TB hard drives
- C. The new nodes must all contain 8TB of disk space, but it does not matter how the disks are configured
- D. The new nodes cannot contain more than 8TB of disk space
What two processes must you do if you are running a Hadoop cluster with a single NameNode and six DataNodes, and you want to change a configuration parameter so that it affects all six DataNodes.
- A. You must modify the configuration files on the NameNode only. DataNodes read their configuration from the master nodes.
- B. You must modify the configuration files on only one of the DataNode machine
- C. You must restart the NameNode daemon to apply the changes to the cluster
- D. You must modify the configuration files on each of the six DataNode machines.
- E. You must restart all six DataNode daemons to apply the changes to the cluster.
- F. You don't need to restart any daemon, as they will pick up changes automatically.
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What information is stored on disk on the NameNode? (Choose 4)
- A. A catalog of DataNodes and the blocks that are stored on them.
- B. The directory structure of the files in HDFS.
- C. File permissions of the files in HDFS.
- D. An edit log of changes that have been made since the last snapshot compaction by the Secondary NameNode.
- E. The status of the heartbeats of each DataNode.
- F. Names of the files in HDFS.
- G. An edit log of changes that have been made since the last backup of the NameNode.
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