Figure 4. Change User Roles Using the Admin Menu
Since the time displayed on the Grafana UI uses the browser's timezone and that displayed on the Spark History
server's UI uses the Urika-GX system's timezone, the timezones displayed on the two UIs may not be the same.
By default, Grafana's refresh rate is turned off on the Urika-GX system. Sometimes the Hadoop and Spark
Grafana dashboards take longer to load than expected. The usual cause of this issue is the time it takes InfluxDB
to return all of the requested data. To reduce the time for the Hadoop and Spark dashboards to display data, refer
to
Update the InfluxDB Data Retention Policy
on page 54. Reducing the amount of data retained makes Grafana
dashboards display faster.
4.4
Default Grafana Dashboards
The default set of Grafana dashboards shipped with Urika-GX include:
●
Aggregate Compute Node Performance Statistics - Displays graphs representing statistical data related to
network, CPU, and I/O utilization for all Urika-GX nodes.
This dashboard contains the following graphs:
○
CPU AND MEMORY
▪
CPU utilization - Displays the overall CPU utilization for all nodes.
▪
Memory utilization - Displays the overall memory used by all nodes.
○
FILE SYSTEM DATA RATES
▪
SSD Reads/Writes Bytes/Second - Displays SSD utilization for all nodes.
System Monitoring
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