How to read `hadoop dfsadmin -report` output - hadoop

Question

Command:
[hdfs#sandbox oozie]$ hadoop dfsadmin -report|head -n 100
Output:
DEPRECATED: Use of this script to execute hdfs command is deprecated.
Instead use the hdfs command for it.
Configured Capacity: 44716605440 (41.65 GB)
Present Capacity: 31614091245 (29.44 GB)
DFS Remaining: 30519073792 (28.42 GB)
DFS Used: 1095017453 (1.02 GB)
DFS Used%: 3.46%
Under replicated blocks: 657
Blocks with corrupt replicas: 0
Missing blocks: 0
Missing blocks (with replication factor 1): 0
-------------------------------------------------
Live datanodes (1):
Name: 10.0.2.15:50010 (sandbox.hortonworks.com)
Hostname: sandbox.hortonworks.com
Decommission Status : Normal
Configured Capacity: 44716605440 (41.65 GB)
DFS Used: 1095017453 (1.02 GB)
Non DFS Used: 13102514195 (12.20 GB)
DFS Remaining: 30519073792 (28.42 GB)
DFS Used%: 2.45%
DFS Remaining%: 68.25%
Configured Cache Capacity: 0 (0 B)
Cache Used: 0 (0 B)
Cache Remaining: 0 (0 B)
Cache Used%: 100.00%
Cache Remaining%: 0.00%
Xceivers: 4
Last contact: Thu Aug 11 23:12:04 UTC 2016
What is Cache Used%, Non DFS Used specially???

Answer 1

hdfs dfsadmin -report command:
Reports basic filesystem information and statistics. Optional flags
may be used to filter the list of displayed DataNodes.
..from official page of hadoop
About,
Cache Used%:
It depends on "Configured Cache Capacity". It's the percentage of the configured value. As you have not configured any space for cache, it is shown as 100% (0 B out of 0 B)
NonDFS used:
It is calculated using following formula
NonDFS used = Configured Capacity - DFS Used - DFS Remaining