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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Your cluster Mapreduce V1 (MVR1). What determines where blocks are return into HDFS client application?

A) The clients sends the data to the name node, which then writes those blocks to the data nodes
B) the client writes immediately to data nodes at random
C) The client queries the name node, which returns information on which data nodes to use. Then client writes to those data nodes.
D) The client immediately to data nodes based on the clusters rack locality settings

2. In HDFS, you view a file with rw-r--r-- set as its permissions. What does this tell you about the file?

A) The file cannot be deleted by anyone
B) As a Filesystem in Userspace (FUSE), HDFS files are available to all user's on a cluster regardless of their underlying POSIX permissions.
C) The file's contents can be modified by the owner, but no-one else
D) The file cannot be deleted by anyone but the owner
E) The file cannot be run as a MapReduce job

3. You are running a Hadoop cluster with NameNode on host mynamenode, a secondary NameNode on host mysecondary and DataNodes.
Which best describes how you determine when the last checkpoint happened?

A) Connect to the web UI of the NameNode (http://mynamenode:50070/) and look at the "Last Checkpoint" information
B) Connect to the web UI of the Secondary NameNode (http://mysecondarynamenode:50090) and look at the "Last Checkpoint" information
C) Execute hdfs dfsadmin -saveNameSpace on the command line which returns to you the last checkpoint value in fstime file.
D) Execute hdfs dfsadmin -report on the command line in and look at the Last Checkpoint information.

4. In the context of configuring a Hadoop cluster for HDFS High Availability (HA), 'fencing' refers to:

A) Isolating the standby NameNode from write access to the fsimage and edits files.
B) Isolating the cluster's master daemon to limit write access only to authorized clients.
C) Isolating both HA NameNodes to prevent a client application from killing the NameNode daemons.
D) Isolating a failed NameNode from write access to the fsimage and edits files so that is cannot resume write operations if it recovers.

5. You have cluster running with the FIFO Scheduler enabled. You submit a large job A to the cluster, which you expect to run for one hour. Then, you submit job B to cluster, which you expect to run a couple of minutes only.
You submit both jobs with the same priority.
Which two best describes how the FIFO Scheduler arbitrates the cluster resources for a job and its tasks?

A) Because there is more then a single job on the cluster, the FIFO Scheduler will enforce a limit on the percentage of resources allocated to a particular job at any given time.
B) Given Jobs A and B submitted in that order, all tasks from job A are guaranteed to finish before all tasks from job B.
C) The FIFO Scheduler will give, on average, equal share of the cluster resources over the job lifecycle.
D) Tasks are scheduled in the order of their jobs' submission.
E) The order of execution of tasks within a job may vary.
F) The FIFO Schedule will pass an exception back to the client when Job B is submitted, since all slots on the cluster are in use.

Solutions: