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Cloudera CCA-470 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Installation & Configuration | 25% | - Configuring core services in CDH4 - Cloudera Manager integration and configuration - Upgrading clusters from CDH3 to CDH4 |
| Security & Data Management | 15% | - HDFS optimization and maintenance - Security enhancements in CDH4 - Data ingestion with Flume and Sqoop |
| Cluster Maintenance & Upgrades | 10% | - Performing rolling upgrades - Backup and recovery procedures |
| Cluster Administration & Operations | 25% | - Troubleshooting common CDH4 issues - Monitoring CDH4 clusters and services - Managing resources with YARN schedulers |
| CDH4 Architecture & New Features | 25% | - HDFS high availability enhancements - MapReduce v2 vs MapReduce v1 differences - YARN architecture and resource management |
Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) Sample Questions:
What do you need to do when adding new slave nodes to a cluster?
- A. Halt and resubmit any running MapReduce jobs to guarantee correctness.
- B. add the new node's DNS name to the conf/slaves file on the master node.
- C. Restart the NameNode daemon.
- D. Increase the value of dfs.number.of.nodes in hdfs-site.xml.
- E. Add a new entry to /etc/slavenodes on the NameNode host.
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How does the NameNode know DataNodes are available on a cluster running MapReduce v1 (MRv1)
- A. DataNodes listed in the dfs.hosts file. The NameNode uses as the definitive list of available DataNodes.
- B. The NameNode broadcasts a heartbeat on the network on a regular basis, and DataNodes respond.
- C. The NameNode send a broadcast across the network when it first starts, and DataNodes respond.
- D. DataNodes heartbeat in the master on a regular basis.
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What action occurs automatically on a cluster when a DataNode is marked as dead?
- A. The NameNode forces re-replication of all the blocks which were stored on the dead DataNode.
- B. The NameNode informs the client which write the blocks that are no longer available; the client then re-writes the blocks to a different DataNode.
- C. The next time a client submits job that requires blocks from the dead DataNode, the JobTracker receives no heart beats from the DataNode. The JobTracker tells the NameNode that the DataNode is dead, which triggers block re-replication on the cluster.
- D. The replication factor of the files which had blocks stored on the dead DataNode is temporarily reduced, until the dead DataNode is recovered and returned to the cluster.
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On a cluster running MapReduce v1 (MRv1), a MapReduce job is given a directory of 10 plain text as its input directory. Each file is made up of 3 HDFS blocks. How many Mappers will run?
- A. 10
- B. 30
- C. We cannot say; the number of Mappers is determined by the developer
- D. 1
What does CDH packaging do on install to facilitate Kerberos security setup?
- A. Creates users for hdfs and mapreduce to facilitate role assignment.
- B. Creates a set of pre-configured Kerberos keytab files and their permissions.
- C. Creates directories for temp, hdfs, and mapreduce with correct permissions.
- D. Automatically configure permissions for log files at $MAPPED_LOG_DIR/userlogs
- E. Creates and configures you kdc with default cluster values.
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