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

Question

Quizplus · Accepted Answer

The Secondary NameNode's web UI provides information about the last checkpoint, which is the process of merging the edit logs with the current file system image.

You Are Running a Hadoop Cluster with a NameNode on Host