[KAFKA-8631] different behavior of the values of isrExpandsPerSec

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.1.1
• Component/s: metrics
• Flags: Important
• Assignee: Unassigned
• Reporter: Christian Tsatedem Kuete
• Created: 05/Jul/19 11:58
• Updated: 05/Jul/19 11:59

Description

We have a Kafka-Cluster in Production Environment and Test Environment.  We have a Monitoring-Solution with Metricbeat and Jolokia. The metric "'kafka.server:name=IsrExpandsPerSec,type=ReplicaManager'" has different behavior in PROD and Test Environment.

Behavior in TEST Environment:

• The value of IsrExpandsPerSec is always the half of the total numder of partitions in the Cluster. For example for a Total number of 88 Partitions the IsrExpandsPerSec is always 44.
• The Value of IsrExpandsPerSec  is never 0

Behavior in Production Environment:

• The value of IsrExpandsPerSec is either the double of the total number of partitions in the Cluster or 0. For example for a Total number of 88 Partitions the  IsrExpandsPerSec is either 176 or 0.
• The Value of IsrExpandsPerSec  is  0, when isrShrinksPerSec is 12.
• The Value of IsrExpandsPerSec  is  176, when isrShrinksPerSec is 0.

We expect both values to be regularly 0.
Thanks in advance