Cloudera CCA-410

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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. The failure of which daemon makes HDFS unavailable on a cluster running MapReduce v1 (MRv1)?

A) Node Manager
B) Application Manager
C) Secondary NameNode
D) NameNode
E) Resource Manager
F) DataNode

2. Which command does Hadoop offer to discover missing or corrupt HDFS data?

A) Hadoop does not provide any tools to discover missing or corrupt data; there is no need because three replicas are kept for each data block.
B) The map-only checksum utility,
C) Fsck
D) Dskchk
E) Du

3. MapReduce V2 (MRv2/YARN) splits which two major functions of the jobtracker into separate daemons?

A) Resource management
B) Job scheduling/monitoring
C) Health status check (heartbeats)
D) Managing tasks
E) Launching tasks
F) Managing file system metadata
G) MapReduce metric reporting
H) Job coordination between the resource manager and the node manager

4. What determines the number of Reduces that run a given MapReduce job on a cluster running MapReduce v1 (MRv1)?

A) It is set and fixed by the cluster administrator in mapred-site.xml. The number set always run for any submitted job.
B) It is set by the developer.
C) It is set by the Hadoop framework and is based on the number of InputSplits of the job.
D) It is set by the JobTracker based on the amount of intermediate data.

5. You've configured your cluster with HDFS Federation. One NameNode manages the /data namesapace and another Name/Node manages the /reports namespace. How do you configure a client machine to access both the /data and the /reports directories on the cluster?

A) You cannot configure a client to access both directories in the current implementation of HDFS Federation.
B) You don't need to configure any parameters on the client machine. Access is controlled by the NameNodes managing the namespace.
C) Configure the client to mount the /data namespace. As long as a single namespace is mounted and the client participates in the cluster, HDFS grants access to all files in the cluster to that client.
D) Configure the client to mount both namespaces by specifying the appropriate properties in the core-site.xml

Solutions: