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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. What are the permissions of a file in HDFS with the following:rw-rw-r-x?

A) the owner and group can read the file other can't
B) the owner and group can modify the contents of the file other can't
C) No one can modify the content of the file
D) HDFS runs in user space which makes all users with access to the namespace able to read, write and modify all files
E) the owner and group cannot delete the file, but other can

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

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

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

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

4. Your cluster implements HDFS High Availability (HA). You two NameNodes are named nn01 and nn02. What occurs when you execute the command:
Hdfs haadmin -failover nn01 nn02

A) Nn01 is fenced, and nn01 becomes the active NameNode
B) nn02 becomes the standby NameNode and nn02 becomes the active NameNode
C) Nn01 is fenced, and nn02 becomes the active NameNode
D) Nn01 becomes the standby NameNode and nn02 becomes the active NameNode

5. Your cluster has 9 slave nodes. The cluster block size is set to 128 MB and it's replication factor set to three.
How will the hadoop framework distribute block writes from a reducer into HDFS from a reducer outputting a 300MB file?

A) Reducer don't write blocks into HDFS
B) The 9 blocks will be return randomly to the nodes; some may receive multiple blocks some may receive none
C) The 9 blocks will be return to 3 nodes, such that each of the three get's one copy of each block
D) The node on which the reducer is running will receive one copy of the each block. The other replicas will be placed on other nodes in the cluster
E) All 9 nodes will each receive exactly one block

Solutions: