Ensurepass    QUESTION 11 What is the Secondary NameNode?   A. An alternate data channel for clients to reach HDFS, should the NameNode become too busy. B. A process that performs a checkpoint operation on the files produced by the NameNode. C. A data channel between the primary name node and the tertiary NameNode. D. A process purely intended to perform backups of the NameNode. E. A standby NameNode, for high availability.   Answer: B Reference: http://wiki.apache.org/hadoop/FAQ#What_is_the_purpose_of_the_secondary_name- Read more [...]
Ensurepass  Exam A   QUESTION 1 Which of the following commands does Hadoop offer to discover missing or corrupt HDFS data?   A. Hadoop does not provide any tools to discover missing or corrupt data; there is no need because three replicas are kept for each data block. B. dskchk C. du D. fsck E. The map-only checksum utility.   Answer: D Reference: http://docs.hortonworks.com/CURRENT/index.htm#Monitoring_HDP/Using_Nagios_With_ Hadoop/Nagios_Alerts_For_Hadoop_Services.htm Read more [...]