[
https://issues.apache.org/jira/browse/KAFKA-13936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546407#comment-17546407
]
Matthias J. Sax commented on KAFKA-13936:
-----------------------------------------
The docs are in the same repository as the code:
[https://github.com/apache/kafka/tree/trunk/docs]
A good place might be the consumer monitoring section
[https://kafka.apache.org/documentation/#consumer_fetch_monitoring] ?
> 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
> Priority: Major
>
> I have a kafka streams application and I'm trying to monitor the consumer lag
> via stream metrics.
> Here's some code snippet
> {code:java}
> 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;
> }
> }
> }
> {code}
> 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?
--
This message was sent by Atlassian Jira
(v8.20.7#820007)
