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| Section | Objectives |
|---|---|
| Topic 1: Security and Cluster Management | - Authentication and authorization
|
| Topic 2: Cluster Installation and Upgrade (CDH4) | - Upgrade process
|
| Topic 3: HDFS Administration | - Maintenance and troubleshooting
|
| Topic 4: Hadoop Cluster Architecture | - Core Hadoop components overview
|
| Topic 5: Hadoop Ecosystem Tools | - Data processing tools
|
| Topic 6: YARN and Resource Management | - Resource scheduling
|
Question 1
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. Execute hdfs dfsadmin -report on the command line in and look at the Last Checkpoint information.
C. Connect to the web UI of the Secondary NameNode (http://mysecondarynamenode:50090) and look at the "Last Checkpoint" information
D. Execute hdfs dfsadmin -saveNameSpace on the command line which returns to you the last checkpoint value in fstime file.
Question 2
How must you format the underlying filesystem of your Hadoop cluster's slave nodes running on Linux?
A. They must be formatted as HDFS
B. They may be formatted in nay Linux filesystem
C. They must be formatted as either ext3 or ext4
D. They must not be formatted - - HDFS will format the filesystem automatically
Question 3
For each job, the Hadoop framework generates task log files. Where are Hadoop's task log files stored?
A. Cached on the local disk of the slave node running the task, then purged immediately upon task completion.
B. In HDFS, in the directory of the user who generates the job.
C. Cached on the local disk of the slave node running the task, then copied into HDFS.
D. On the local disk of the slave node running the task.
Question 4
Identify which two daemons typically run each slave node in a Hadoop cluster running MapReduce v1 (MRv1)
A. DataNode
B. TaskTracker
C. NameNode
D. JobTracker
E. Secondary NameNode
F. NodeManager
Question 5
Identity four pieces of cluster information that are stored on disk on the NameNode?
A. An edit log of changes that have been made since the last snapshot compaction by the Secondary NameNode.
B. Names 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. File permissions of the files in HDFS.
F. The status of the heartbeats of each DataNode.
G. An edit log of changes that have been made since the last snapshot of the NameNode.
Solutions:
| Question 1 Answer: C | Question 2 Answer: C | Question 3 Answer: B | Question 4 Answer: A,B | Question 5 Answer: A,B,C,F |
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