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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:
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
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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
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.
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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
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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.
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