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Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) Sample Questions:

1. Your cluster has nodes in seven racks, and you have provided a rack topology script. What is Hadoop's block placement policy, assuming a block replication factor of three?

A) All three of the block are written to nodes on the same rack
B) Because there are seven racks the block is written to a node on each rack
C) One copy of the block is written to a node in each of three racks
D) One copy of the block is written to a node in one rack; two copies are written to two nodes in a different rack

2. Assuming a large properly configured multi-rack Hadoop cluster, which scenario should not result in loss of HDFS data assuming the default replication factor settings?

A) All DataNodes simultaneously fail.
B) An entire rack fails.
C) Seventy percent of DataNodes simultaneously fail.
D) Multiple racks simultaneously fail.
E) Ten percent of DataNodes simultaneously fail.

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

4. What is the standard configuration of slave nodes in a Hadoop cluster?

A) Each slave node either runs a TaskTracker or a DataNode daemon, but not both.
B) Each slave node runs a TaskTracker, but only a fraction of the slave nodes run DataNode daemons.
C) Each slave node runs a DataNode daemon, but only a fraction of the slave nodes run TaskTrackers.
D) Each slave node runs a TaskTracker and a DataNode daemon.
E) Each slave node runs a JobTracker and a DataNode daemon.

5. 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.

Solutions: