Aravindan Vijayan created AMBARI-18289:
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Summary: Invalid negative values for some AMS metrics
Key: AMBARI-18289
URL: https://issues.apache.org/jira/browse/AMBARI-18289
Project: Ambari
Issue Type: Bug
Components: ambari-metrics
Affects Versions: 2.4.0
Reporter: Aravindan Vijayan
Assignee: Aravindan Vijayan
Priority: Critical
Fix For: 2.5.0
PROBLEM
Negative values are being reported for IOPS in the "system servers" dashboard
BUG
This was a dockerized environment. Negative rate values were seen because
read/write counters were dropping below the previous values at random times. On
further investigation, it revealed that this was due to the docker volume
groups present on the host. It is expected of docker containers to add/remove
the volume groups during the lifecyle of a container. So, when a volume group
goes away, the read/write counters do not contribute to the total counter
values, thus making the value go below the last seen value.
FIX
Have a provision to discard such "special" disk partitions through a skip
pattern. Individual disk counter metrics can be used to get disk specific
counter values. If skipped, they will not contribute to the global counter
metric.
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