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Cloudera CCA-410 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| HDFS Administration | - Filesystem management
|
| Security and Cluster Operations | - Operational maintenance
|
| Hadoop Cluster Architecture (CDH4) | - Core Hadoop components
|
| Data Processing Tools and Ecosystem | - Data ingestion and processing tools
|
| Cluster Installation and Configuration | - CDH4 setup
|
| Cluster Monitoring and Troubleshooting | - System monitoring
|
Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:
1. You have a cluster running 32 slave nodes and 3 master nodes running mapreduce V1 (MRv1). You execute the command:
$ hadoop fsck /
What four cluster conditions running this command will return to you?
A) Under-replicated blocks
B) the current state of the file system according to the namenode
C) Number of dead datanodes
D) Blocks replicated improperly or that don't satisfy your cluster enhancement policy (e. g. , too many blocks replicated on the same node)
E) The current state of the file system returned from scanning individual blocks on each datanode
F) Number of datanodes
G) the location for every block
H) Configure capacity of your cluster
2. Your cluster Mode size is set to 128MB. A client application (client application A) is writing a 500MB file to HDFS. After client application A has written 300MB of data, another client (client application B) attempts to read the file. What is the effect of a second client requesting a file during a write?
A) Client application B must wait until the entire file has been written, and will then read its entire contents.
B) Application B can read 256MB of the file
C) Client application on B can read the 300MB that has been written so far.
D) Client application B returns an error
3. Your Hadoop cluster contains nodes in three racks. Choose which scenario results if you leave the dfs.hosts property in the NameNode's configuration file empty (blank)?
A) The NameNode will update dfs.hosts property to include machines running the DataNode daemon on the next NameNode reboot or with a dfsadmin -refreshNodes.
B) No new can be added to the cluster until you specify them in the dfs.hosts file.
C) Presented with a blank dfs.hosts property, the NameNode will permit DataNodes specified in mapred.hosts to join the cluster.
D) Any machine running the DataNode daemon can immediately join the cluster.
4. In a cluster configured with HDFS High Availability (HA) but NOT HDFS federation, each map task run:
A) In the same Java Virtual Machine as the JobTracker.
B) In its own Java Virtual Machine.
C) In the same Java Virtual Machine as the DataNode.
D) In the same Java Virtual Machine as the TaskTracker
5. 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 -saveNameSpace on the command line which returns to you the last checkpoint value in fstime file.
C) Connect to the web UI of the Secondary NameNode (http://mysecondarynamenode:50090) and look at the "Last Checkpoint" information
D) Execute hdfs dfsadmin -report on the command line in and look at the Last Checkpoint information.
Solutions:
| Question # 1 Answer: A,D,E,F | Question # 2 Answer: B | Question # 3 Answer: B | Question # 4 Answer: B | Question # 5 Answer: C |



