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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

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

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

2. Which three distcp features can you utilize on a Hadoop cluster?

A) Use distcp to copy physical blocks from the source to the target destination in your cluster.
B) Use distcp to copy data between directories inside the same cluster.
C) Use distcp to run an internal MapReduce job to copy files.
D) Use distcp to copy HBase table files.
E) Use distcp to copy files only between two clusters or more. You cannot use distcp to copy data between directories inside the same cluster.

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

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

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

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

5. You have a cluster running with the fair scheduler enabled and configured. You submit multiple jobs to the cluster. Each job is assigned to a pool. What are the two key points to remember about how jobs are scheduled with the fair scheduler?

A) Pools are assigned priorites.pools with higher priorities an executed b4 pools with lower priorities
B) Each pools share of task slots may change throughout the course of job execution
C) Each pool gets 1/M of the total available tasks slots, where M is the no. of nodes in the cluster
D) Each pool gets 1/N of the total available tasks slots, where N is the no of jobs running on the cluster
E) Each pools share of the tasks slots remains static within the execution of any individual job
F) Pools get a dynamically-allocated share of the available task slots (subject to additional constraints)

Solutions: