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Cloudera CCA-470 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Hadoop Cluster Architecture | - Core Hadoop components overview
|
| HDFS Administration | - Maintenance and troubleshooting
|
| Hadoop Ecosystem Tools | - Data ingestion tools
|
| YARN and Resource Management | - Resource scheduling
|
| Security and Cluster Management | - Authentication and authorization
|
| Cluster Installation and Upgrade (CDH4) | - Upgrade process
|
Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) Sample Questions:
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 returns an error
- B. Client application B must wait until the entire file has been written, and will then read its entire contents.
- C. Client application on B can read the 300MB that has been written so far.
- D. Application B can read 256MB of the file
Correct Answer: B 🗳️
It is recommended that you run the HDFS balancer periodically. Why? (Choose 3)
- A. To help HDFS deliver consistent performance under heavy loads.
- B. To improve data locality for MapReduce tasks.
- C. To ensure that there is consistent disk utilization across the DataNodes.
- D. To ensure that all blocks in the cluster are 128MB in size.
- E. To ensure that there is capacity in HDTS for additional data.
Correct Answer: A,C,E 🗳️
Explanation: Only visible for TestInsides members. You can sign-up / login (it's free).
You has a cluster running with the Fail Scheduler enabled. There are currently no jobs running on the cluster you submit a job A, so that only job A is running on the cluster. A while later, you submit job B.
Now job A and Job B are running on the cluster al the same time. How will the Fair' Scheduler handle these two Jobs?
- A. When job B gets submitted, Job A has to finish first, before job it can get scheduled.
- B. When job B gets submitted, it will get assigned tasks, while job A continues to run with fewer tasks.
- C. When job A gets submitted, it doesn't consume all the task slot
- D. When job A gets submitted, it consumes all the task slot
Correct Answer: B 🗳️
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You set up the Hadoop cluster using NameNode Federation. One NameNode manages the/users namespace and one NameNode manages the/data namespace. What happens when client tries to write a file to/reports/myreport.txt?
- A. The file successfully writes to /users/reports/myreports/myreport.txt.
- B. The file writes fails silently; no file is written, no error is reported.
- C. The client throws an exception.
- D. The file successfully writes to /report/myreport.txt. The metadata for the file is managed by the first NameNode to which the client connects.
Correct Answer: D 🗳️
Explanation: Only visible for TestInsides members. You can sign-up / login (it's free).
On a cluster running MapReduce v1 (MRv1), the value of the mapred.tasktracker.map.tasks.maximum configuration parameter in the mapred-site.xml file should be set to:
- A. The same value on each slave node.
- B. The maximum number of Map tasks can run simultaneously on an individual node.
- C. Half the number of the maximum number of Reduce tasks which can run on the cluster as a whole.
- D. Half the number of the maximum number of Reduce tasks which can run simultaneously on an individual node.
- E. The maximum number of Map tasks which can run on the cluster as a whole.
Correct Answer: B 🗳️
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