What does Host Disk Usage alert mean?

[#1]

Hello,

I've got the alerts mentioned in "alerts.png" for all my cluster nodes. I need to understand what does it mean and to which fields mentioned in "fields.png" does 21,1 GB correspond ? What it is the relation between 21.1 GB and the attached fields?

When, i navigate to my hosts through ambari UI, i got Disk usage mentioned in "hosts.png". So, what does 19.62 GB mean ? And is there a relation between 19.62 GB and 21.1 GB?

So, how can i fix this alert?

[#2]

@raouia

"Host Disk Usage alert" Is actually a "Host-Level" alert is triggered if the amount of "disk space used on a host" (Not on DFS) goes above specific thresholds (50% WARNING, 80% CRITICAL default values ).

"fields.png" --> Shows the HDFS Usage. (Only the HDFS file system usage , Not the Disk Usage). This image shows that total 3GB of overall HDFS are being utilized so far at the cluster level.

"hosts.png" --> Shows the "Disk Usage" of the "Highlighted" Host (which is 88.53% used with total capacity 19.62GB)

"alerts.png" --> This alert performs advanced disk checks under Linux. This will first attempt to check the HDP installation directories if they exist. If they do not exist, it will default to checking /

.

For more details please see [1], So if you see the complete alert message then you will find that it might be showing the complete message as following (Please check the path that it calculates at the end it might be "/usr/hdp" so it can be different from the hosts.png usage)

Example:

Capacity Used: [84.15%, 17.7 GB], Capacity Total: [21.1 GB], path=/usr/hdp

[1] https://github.com/apache/ambari/blob/release-2.5.2/ambari-server/src/main/resources/host_scripts/al...

[#3]

@raouia

Do you have any queries regarding my previous update? Please feel free to update.