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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

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

2. What does each block of a file contain where it is return into HDFS?

A) Each block as a header containing metadata
B) Each block contains only data from the file
C) Each block writes a separate meta file containing information on the file name of which the block is a part
D) Each block has a header and footer containing metadata

3. Which MapReduce v2 (MR2/YARN) daemon is a per-machine slave responsible for launching application containers and monitoring application resources usage?

A) TaskTracker
B) ApplicationMasterService
C) NodeManager
D) ApplicationMaster
E) ResourceManager
F) JobTracker

4. Which two updates occur when a client application opens a stream to begin a file write on a cluster running MapReduce v1 (MRv1)?

A) The change is written to the edits file.
B) The metadata in RAM on the NameNode is updated.
C) The metadata in RAM on the NameNode is flushed disk.
D) The change is written to the NameNode disk.
E) Once the write stream closes on the DataNode, the DataNode immediately initiates a black report to the NameNode.
F) The metadata in the RAM on the NameNode is flushed to disk.

5. In the execution of a MapReduce job, where does the mapper place the intermediate data in each map task?

A) The mapper transfer the intermediate data immediately to the reducers as it is generated by map task.
B) The mapper stores the intermediate data on the underlying filesystem of the local disk of the machine which ran the map task
C) The hadoop framework holds the intermediate data in the task trackers memory until it is transferred to the reducers
D) The mapper transfers the intermediate data to the jobtracker, which then sends it to the reducers

Solutions: