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Cloudera CCA-470 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Hadoop Ecosystem Tools | - Data processing tools
|
| Topic 2: Security and Cluster Management | - Authentication and authorization
|
| Topic 3: HDFS Administration | - Filesystem operations
|
| Topic 4: YARN and Resource Management | - Resource scheduling
|
| Topic 5: Cluster Installation and Upgrade (CDH4) | - Upgrade process
|
| Topic 6: Hadoop Cluster Architecture | - Core Hadoop components overview
|
Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) Sample Questions:
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 performs deal-time backups of the NameNode.
- 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 is standby NameNode, ready to failover and provide high availability.
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Which MapReduce v2 (MR2/YARN) daemon is a per-machine slave responsible for launching application containers and monitoring application resources usage?
- A. ApplicationMaster
- B. NodeManager
- C. ApplicationMasterService
- D. ResourceManager
- E. JobTracker
- F. TaskTracker
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For a MapReduce job, what's the relationship between tasks and task attempts?
- A. There are always at most as many task attempts as there are tasks.
- B. There are always at least as many task attempts as there are tasks.
- C. There are always exactly as many task attempts as there are tasks.
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. You cannot configure a client to access both directories in the current implementation of HDFS Federation.
- B. 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.
- 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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You observe that the number of spilled records from map tasks for exceeds the number of map output records. You child heap size is 1 GB and your io.sort.mb value is set to 100MB. How would you tune your io.sort.mb value to achieve maximum memory to disk I/O ratio?
- A. Decrease the io.sort.mb value below 100M
- B. For 1GB child heap size an io.sort.mb of 128MB will always maximum memory to disk I/O.
- C. Increase the IO.sort.mb as high you can, as close to 1GB as possible.
- D. Tune io.sort.mb value until you observe that the number of spilled records equals (or is as close to equals) the number of map output records.
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