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Difference between HDFS Disk Usage and HDFS Space Utilization in Ambari console

Difference between HDFS Disk Usage and HDFS Space Utilization in Ambari console

In the Ambari console on the main landing page there is a metric reporting HDFS Disk Usage as 79%. If I then navigate to the HDFS service page there's another metric reporting HDFS Space Utilization as 74%. What's the difference between these 2 metrics and which is a better indicator of how much space I have left?

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