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

During the execution of a MapReduce v2 (MRv2) job on YARN, where does the Mapper place the intermediate data of each Map Task?

1. A. The Mapper stores the intermediate data on the node running the Job’s ApplicationMaster so that it is available to YARN ShuffleService before the data is presented to the Reducer
2. B. The Mapper stores the intermediate data in HDFS on the node where the Map tasks ran in the HDFS /usercache/&(user)/apache/application_&(appid) directory for the user who ran the job
3. C. The Mapper transfers the intermediate data immediately to the reducers as it is generated by the Map Task
4. D. YARN holds the intermediate data in the NodeManager’s memory (a container) until it is transferred to the Reducer
5. E. The Mapper stores the intermediate data on the underlying filesystem of the local disk in the directories yarn.nodemanager.locak-DIFS

Correct Answer: E