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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

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

A) Du
B) Fsck
C) Dskchk
D) The map-only checksum utility,
E) 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.

2. What four functions do scheduling algorithms perform on hadoop cluster?

A) Run jobs at periodic times of the day
B) Reduce the total amount of computation necessary to complete a job.
C) allow short jobs to complete even when large, long jobs (consuming a lot of resources are running)
D) Ensure data locality by ordering map tasks so that they run on data local maps slots
E) Reduce the job latencies in environment with multiple jobs of different sizes
F) support the implementation of service-level agreements for multiple cluster users
G) Allow multiple users to share clusters in a predictable policy-guided manner

3. A client application opens a file write stream on your cluster. Which two metadata changes occur during a file write?

A) the metadata in Ram on the namenode is flushed to disk
B) the change is written to the fsimage file
C) The metadata in a Ram on the name node is updated
D) The change is written to the edits file
E) The change is written to the namenode disk
F) the change is written to the secondary namenode
G) the namenode triggers a block report to update block locations in the edits file

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

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

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

Solutions: