CCA-500 Free Practice Test

You are running a Hadoop cluster with a NameNode on host mynamenode, a secondary NameNode on host mysecondarynamenode and several DataNodes.
Which best describes how you determine when the last checkpoint happened?

1. A. Execute hdfs namenode –report on the command line and look at the Last Checkpoint information
2. B. Execute hdfs dfsadmin –saveNamespace on the command line which returns to you the last checkpoint value in fstime file
3. C. Connect to the web UI of the Secondary NameNode (http://mysecondary:50090/) and look at the “Last Checkpoint” information
4. D. Connect to the web UI of the NameNode (http://mynamenode:50070) and look at the “Last Checkpoint” information

Correct Answer: C
Reference:https://www.inkling.com/read/hadoop-definitive-guide-tom-white-3rd/chapter- 10/hdfs

You are running a Hadoop cluster with a NameNode on host mynamenode. What are two ways to determine available HDFS space in your cluster?

1. A. Run hdfs fs –du / and locate the DFS Remaining value
2. B. Run hdfs dfsadmin –report and locate the DFS Remaining value
3. C. Run hdfs dfs / and subtract NDFS Used from configured Capacity
4. D. Connect to http://mynamenode:50070/dfshealth.jsp and locate the DFS remaining value

Correct Answer: B

Your cluster’s mapred-start.xml includes the following parameters
mapreduce.map.memory.mb
4096
mapreduce.reduce.memory.mb
8192
And any cluster’s yarn-site.xml includes the following parameters
yarn.nodemanager.vmen-pmen-ration
2.1
What is the maximum amount of virtual memory allocated for each map task before YARN will kill its Container?

1. A. 4 GB
2. B. 17.2 GB
3. C. 8.9 GB
4. D. 8.2 GB
5. E. 24.6 GB

Correct Answer: D

Identify two features/issues that YARN is designated to address:(Choose two)

1. A. Standardize on a single MapReduce API
2. B. Single point of failure in the NameNode
3. C. Reduce complexity of the MapReduce APIs
4. D. Resource pressure on the JobTracker
5. E. Ability to run framework other than MapReduce, such as MPI
6. F. HDFS latency

Correct Answer: DE
Reference:http://www.revelytix.com/?q=content/hadoop-ecosystem(YARN, first para)

You are working on a project where you need to chain together MapReduce, Pig jobs. You also need the ability to use forks, decision points, and path joins. Which ecosystem project should you use to perform these actions?

1. A. Oozie
2. B. ZooKeeper
3. C. HBase
4. D. Sqoop
5. E. HUE

Correct Answer: A