[AMBARI-24123] Grafana System-Servers Dashboard Disk IO/IOPS shows negative values

• Type: Bug
• Status: Open
• Priority: Trivial
• Resolution: Unresolved
• Affects Version/s: 2.6.2
• Component/s: ambari-metrics

Environment

HDP 2.6.4.0-91

Ambari 2.6.2.0

SLES 12

 

Side note we did not observe this in HDP 2.5.3, Ambari 2.5.2

• Assignee: Unassigned
• Reporter: David F. Quiroga
• Created: 15/Jun/18 21:35
• Updated: 18/Jun/18 13:46

Description

Grafana > System-Servers Dashboard 

Charts > Disk IO - Read Bytes, Write Bytes, Disk IOPS - Read Count, Write Count

All display negative values for one or more hosts when viewed over a large time period (6+ hrs)

Attached screenshots are for single host. 6hr shows negative values, but when "zoom-in" on same time period (2hr) there are no negative values. 

Therefore suspects it relates to aggregation of metrics rather than collection itself.