CCA-500 practice - PrepKeys

Q2 Single choice

Cluster Summary:

45 files and directories, 12 blocks = 57 total. Heap size is 15.31 MB/193.38MB(7%)

Refer to the above screenshot.

You configure a Hadoop cluster with seven DataNodes and on of your monitoring UIs displays the details shown in the exhibit.

What does the this tell you?

A
The DataNode JVM on one host is not active
B
Because your under-replicated blocks count matches the Live Nodes, one node is dead, and your DFS Used % equals 0%, you can't be certain that your cluster has all the data you've written it.
C
Your cluster has lost all HDFS data which had bocks stored on the dead DatNode
D
The HDFS cluster is in safe mode