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Cloudera CCA-410 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Data Processing Tools and Ecosystem | - Query and workflow tools
|
| Hadoop Cluster Architecture (CDH4) | - Core Hadoop components
|
| Cluster Installation and Configuration | - Service configuration
|
| HDFS Administration | - Filesystem management
|
| Cluster Monitoring and Troubleshooting | - System monitoring
|
| Security and Cluster Operations | - Security configuration
|
Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:
Each slave node in your cluster has four 2 TB hard drives installed (4x2TB). You set a value of the dfs.du.datanode.received parameter to 100GB on each slave node. How does this alter HDFS block storage?
- A. a maximum of 100GB on each hard drive may be used to store HDFS blocks
- B. All Hard drives may be used to store HDFS blocks as long as at least 100GB in total is available on the node
- C. 100 GB on each hard drive may not be used to store HDFS blocks
- D. 25 GB on each hard drive may not be used to store HDFS Blocks
Correct Answer: C 🗳️
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Using cloudera manager on CDH4 cluster running mapreduce V1(MRv1), you delete a tasktracker role instance from a host that also a runs a datanode role instance and a region server role instance.cloudera
Manager make changes to the cluster and prompts you to the accept the changes.
What other configuration option will cloudera manager automatically prompt you to change?
- A. The option to failover to the instance by namenode
- B. the option to immediately rebalance the cluster
- C. The option to change java maximum heap sizes for the other role instances
- D. the option to specify an alternate slave host to place the received data node role instance
Correct Answer: D 🗳️
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 the first location in the list of receives.
- C. 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.
- D. 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.
Correct Answer: B 🗳️
What action occurs automatically on a cluster when a DataNode is marked as dead?
- A. 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.
- B. The NameNode forces re-replication of all the blocks which were stored on the dead 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 NameNode informs the client which write the blocks that are no longer available; the client then re-writes the blocks to a different DataNode.
Correct Answer: B 🗳️
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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 each of the six DataNode machines.
- B. You must modify the configuration files on the NameNode only. DataNodes read their configuration from the master nodes.
- C. You don't need to restart any daemon, as they will pick up changes automatically.
- D. You must restart the NameNode daemon to apply the changes to the cluster
- E. You must modify the configuration files on only one of the DataNode machine
- F. You must restart all six DataNode daemons to apply the changes to the cluster.
Correct Answer: B,D 🗳️
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