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Cloudera CCA-410 Exam Syllabus Topics:

Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. For each job, the Hadoop framework generates task log files. Where are Hadoop's task log files stored?

A) In HDFS, in the directory of the user who generates the job.
B) Cached on the local disk of the slave node running the task, then purged immediately upon task completion.
C) On the local disk of the slave node running the task.
D) Cached on the local disk of the slave node running the task, then copied into HDFS.

2. On a cluster running MapReduce v1 (MRv1), the value of the mapred.tasktracker.map.tasks.maximum configuration parameter in the mapred-site.xml file should be set to:

A) The maximum number of Map tasks which can run on the cluster as a whole.
B) Half the number of the maximum number of Reduce tasks which can run simultaneously on an individual node.
C) The same value on each slave node.
D) Half the number of the maximum number of Reduce tasks which can run on the cluster as a whole.
E) The maximum number of Map tasks can run simultaneously on an individual node.

3. Compare the hardware requirements of the NameNode with that of the DataNodes in a Hadoop cluster running MapReduce v1 (MRv1):

A) The NameNode and DataNodes should the same hardware configuration.
B) The NameNode requires more memory and requires greater disk capacity than the DataNodes.
C) The NameNode requires more memory but less disk capacity.
D) The NameNode requires less memory and less disk capacity than the DataNodes.
E) The NameNode requires more memory and no disk drives.

4. What metadata is stored on a DataNode when a block is written to it?

A) Checksums for the data in the block, as a separate file.
B) Node location of each block belonging to the same namespace.
C) Information on the file's location in HDFS.
D) None. Only the block itself is written.

5. You are running a Hadoop cluster with NameNode on host mynamenode, a secondary NameNode on host mysecondary and DataNodes.
Which best describes how you determine when the last checkpoint happened?

A) Connect to the web UI of the NameNode (http://mynamenode:50070/) and look at the "Last Checkpoint" information
B) Execute hdfs dfsadmin -report on the command line in and look at the Last Checkpoint information.
C) Execute hdfs dfsadmin -saveNameSpace on the command line which returns to you the last checkpoint value in fstime file.
D) Connect to the web UI of the Secondary NameNode (http://mysecondarynamenode:50090) and look at the "Last Checkpoint" information

Solutions: