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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Your cluster Mode size is set to 128MB. A client application (client application A) is writing a 500MB file to HDFS. After client application A has written 300MB of data, another client (client application B) attempts to read the file. What is the effect of a second client requesting a file during a write?

A) Application B can read 256MB of the file
B) Client application B returns an error
C) Client application on B can read the 300MB that has been written so far.
D) Client application B must wait until the entire file has been written, and will then read its entire contents.

2. Identify the daemon that performs checkpoint operations of the namespace state in a cluster configured with HDFS High Availability (HA) using Quorum based-storage?

A) NodeManeger
B) CheckpointNode
C) BackupNode
D) NameNode
E) JournalNode
F) Secondary NameNode
G) Standby NameNode

3. 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 pools share of the tasks slots remains static within the execution of any individual job
D) Each pool gets 1/M of the total available tasks slots, where M is the no. of nodes in the cluster
E) Each pool gets 1/N of the total available tasks slots, where N is the no of jobs running on the cluster
F) Pools get a dynamically-allocated share of the available task slots (subject to additional constraints)

4. You are a Hadoop cluster with a NameNode on host mynamenode. What are two ways to determine available HDFS space in your cluster?

A) Connect to http://mynamemode:50070/ and locate the DFS Remaining value.
B) Run hadoop dfsadmin -report and locate the DFS Remaining value.
C) Run hadoop dfsadmin -SpaceQuota and subtract HDFS Used from Configured Capacity.
D) Run hadoop fs -du/and locate the DFS Remaining value.

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

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

Solutions: