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Cloudera CCA-410 Exam Syllabus Topics:

Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Your cluster Mapreduce V1 (MVR1). What determines where blocks are return into HDFS client application?

A) the client writes immediately to data nodes at random
B) The client immediately to data nodes based on the clusters rack locality settings
C) The client queries the name node, which returns information on which data nodes to use. Then client writes to those data nodes.
D) The clients sends the data to the name node, which then writes those blocks to the data nodes

2. 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 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.
B) 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.
C) The client queries the NameNode for the locations of the block, and reads from the first location in the list of receives.
D) 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.

3. What four functions do scheduling algorithms perform on hadoop cluster?

A) Allow multiple users to share clusters in a predictable policy-guided manner
B) Run jobs at periodic times of the day
C) support the implementation of service-level agreements for multiple cluster users
D) Reduce the job latencies in environment with multiple jobs of different sizes
E) Ensure data locality by ordering map tasks so that they run on data local maps slots
F) Reduce the total amount of computation necessary to complete a job.
G) allow short jobs to complete even when large, long jobs (consuming a lot of resources are running)

4. 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.

5. What does CDH packaging do on install to facilitate Kerberos security setup?

A) Creates and configures you kdc with default cluster values.
B) Creates directories for temp, hdfs, and mapreduce with correct permissions.
C) Automatically configure permissions for log files at $MAPPED_LOG_DIR/userlogs
D) Creates users for hdfs and mapreduce to facilitate role assignment.
E) Creates a set of pre-configured Kerberos keytab files and their permissions.

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