Cloudera CCA-470

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

1. Which three processes does HDFS High Availability (HA) enable on your cluster?

A) Shut one NameNode down for maintenance without halting the cluster
B) Automatically 'fail over' between NameNodes if one goes down
C) Configure unlimited hot standby NameNode.
D) Manually 'fail over' between NameNodes
E) Write data to two clusterssimultaneously

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

3. 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) None. Only the block itself is written.
C) Information on the file's location in HDFS.
D) Node location of each block belonging to the same namespace.

4. Cluster Summary
45 files and directories, 12 blocks = 57 total. Heap Size is 15.31 MB / 193.38MB(7%)

Refer to the above screenshot.
You configure the Hadoop cluster with seven DataNodes and the NameNode's web UI displays the details shown in the exhibit.
What does this tells you?

A) One physical host crashed.
B) The DataNode JVM on one host is not active.
C) Your cluster has lost all HDFS data which had blocks stored on the dead DataNode.
D) The HDFS cluster is in the safe mode.

5. What information is stored on disk on the NameNode? (Choose 4)

A) An edit log of changes that have been made since the last backup of the NameNode.
B) File permissions of the files in HDFS.
C) The directory structure of the files in HDFS.
D) A catalog of DataNodes and the blocks that are stored on them.
E) The status of the heartbeats of each DataNode.
F) Names of the files in HDFS.
G) An edit log of changes that have been made since the last snapshot compaction by the Secondary NameNode.

Solutions: