Ensurepass  QUESTION 31 What are the permissions of a file in HDFS with the following:rw-rw-r-x?   A. HDFS runs in user space which makes all users with access to the namespace able to read, write and modify all files B. the owner and group cannot delete the file, but other can C. the owner and group can modify the contents of the file other can't D. the owner and group can read the file other can't E. No one can modify the content of the file   Answer: C Explanation: Read more [...]
Ensurepass  QUESTION 41 What metadata is stored on a DataNode when a block is written to it?   A. None. Only the block itself is written. B. Checksums for the data in the block, as a separate file. C. Information on the file's location in HDFS. D. Node location of each block belonging to the same namespace.   Answer: B Reference: Protecting per-DataNode Metadata     QUESTION 42 What happens if a Mapper on one node goes into an infinite loop while running a MapReduce Read more [...]
Ensurepass  QUESTION 51 You configure your hadoop cluster with mapreduce V1 (MRv1) along with HDFS high availability (HA) Quorum-based storage. On which nodes should you configure and run your journal node daemon(s) to guarantee a quorum?   A. standby namenode, jobtracker, resourcemanager B. Jobtracker C. standby namenode D. Namenode E. Namenode and standby namenode F. Namenode, standby namenode and jobtracker G. On each datanode   Answer: A Explanation: * JournalNode Read more [...]
Ensurepass  QUESTION 11 What is the smallest number of slave nodes you would need to configure in your hadoop cluster to store 100TB of data, using Hadoop default replication values, on nodes with 10TB of RAW disk space per node?   A. 100 B. 25 C. 10 D. 40 E. 75   Answer: D Explanation: Default replication value is 3. The minimum number of nodes needed are: 100 x 3 /10 = 30           The closest answer is here D (40).     QUESTION Read more [...]
Ensurepass  QUESTION 21 Compare the hardware requirements of the NameNode with that of the DataNodes in a Hadoop cluster running MapReduce v1 (MRv1):   A. The NameNode requires more memory and requires greater disk capacity than the DataNodes. B. The NameNode and DataNodes should the same hardware configuration. C. The NameNode requires more memory and no disk drives. D. The NameNode requires more memory but less disk capacity. E. The NameNode requires less memory and less Read more [...]
Ensurepass  Exam A   QUESTION 1 Where does a MapReduce job store the intermediate data output from Mappers?   A. On the underlying filesystem of the local disk machine on which the JobTracker ran. B. In HDFS, in the job's output directory. C. In HDFS, in temporary directory defined mapred.tmp.dir. D. On the underlying filesystem of the local disk of the machine on which the Mapper ran. E. Stores on the underlying filesystem of the local disk of the machine on which Read more [...]