[Solved] If you run the following Cloudera Manager API call:curl -u admin:admin -X GET 'http://cm-server:7180/api/v40/clusters/Cluster1/services/HDFS/metrics/dfs.datanode.... | Hadoop

Hadoop - Cluster Administration

If you run the following Cloudera Manager API call:
curl -u admin:admin -X GET 'http://cm-server:7180/api/v40/clusters/Cluster1/services/HDFS/metrics/dfs.datanode.capacity'
What type of information will you receive?

AHDFS file count

BTotal storage capacity of all DataNodes

CCPU usage of DataNodes

DNumber of active DataNodes

Step-by-Step Solution

Solution:

Step 1: Understand metric name
dfs.datanode.capacity refers to total storage capacity of DataNodes in HDFS.
Step 2: Eliminate other options
Number of DataNodes, CPU usage, and file count are different metrics.
Final Answer:
Total storage capacity of all DataNodes -> Option B
Quick Check:
dfs.datanode.capacity = total DataNode storage [OK]

Quick Trick: Metric names often hint at data type, like capacity for storage [OK]

Common Mistakes:

Confusing capacity with node count
Assuming CPU usage from storage metric

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If you run the following Cloudera Manager API call:

Step 1: Understand metric name

Step 2: Eliminate other options

Final Answer:

Quick Check:

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