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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Which two daemons must be installed on master nodes in hadoop cluster running mapreduce V1 (MRV1)?

A) Datanode
B) Tasktracker
C) Hmaster
D) ApplicationMaster
E) Zookeeper
F) Resourcemanager
G) Namenode

2. You install Cloudera Manager on a cluster where each host has 1 GB of RAM. All of the services show their status as concerning. However, all jobs submitted complete without an error.
Why is Cloudera Manager showing the concerning status KM the services?

A) A slave node's disk ran out of space
B) The slave nodes, haven't sent a heartbeat in 60 minutes
C) DataNode service instance has crashed.
D) The slave nodes are swapping.

3. What occurs when you run a hadoop job specifying output directory for job output which already exists in HDFS?

A) the job will run successfully. Output from the reducers will override the contents of existing directory
B) An error will occur immediately because the output directory must not already exist.
C) an error will occur after the mappers have completed but before any reducers begin to run because the output path must not exist during the shuffle and sort.
D) the job will run successfully output from the reducers will be placed in a directory called job output -1

4. Where does a MapReduce job store the intermediate data output from Mappers?

A) In HDFS, in the job's output directory.
B) Stores on the underlying filesystem of the local disk of the machine on which the Reducer.
C) On the underlying filesystem of the local disk machine on which the JobTracker ran.
D) On the underlying filesystem of the local disk of the machine on which the Mapper ran.
E) In HDFS, in temporary directory defined mapred.tmp.dir.

5. What action occurs automatically on a cluster when a DataNode is marked as dead?

A) 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.
B) 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.
C) 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.
D) The NameNode forces re-replication of all the blocks which were stored on the dead DataNode.

Solutions: