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Posted to dev@kafka.apache.org by "Prashanth Joseph Babu (Jira)" <ji...@apache.org> on 2022/05/25 07:57:00 UTC
[jira] [Created] (KAFKA-13936) Invalid consumer lag when monitoring from a kafka streams application
Prashanth Joseph Babu created KAFKA-13936:
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Summary: Invalid consumer lag when monitoring from a kafka streams application
Key: KAFKA-13936
URL: https://issues.apache.org/jira/browse/KAFKA-13936
Project: Kafka
Issue Type: Bug
Components: streams
Reporter: Prashanth Joseph Babu
I have a kafka streams application and I'm trying to monitor the consumer lag via stream metrics.
Here's some code snippet
```
metrics = streams.metrics(); lag = 0; for (Metric m : metrics.values()) { tags = m.metricName().tags(); if ( m.metricName().name().equals(MONITOR_CONSUMER_LAG) && tags.containsKey(MONTOR_TAG_TOPIC) && tags.get(MONTOR_TAG_TOPIC).equals(inputTopic) ) { partitionLag = Float.valueOf(m.metricValue().toString()).floatValue(); if ( !partitionLag.isNaN() ) { lag += partitionLag; } } }
```
Here MONITOR_CONSUMER_LAG is {{{}records-lag-max{}}}.
However these numbers dont match with the consumer lag we see in the kafka UI . is records-lag-max the right metric to track for a kafka streams application when the objective is to get consumer lag?
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