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https://issues.apache.org/jira/browse/KAFKA-13936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17558339#comment-17558339
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Prashanth Joseph Babu commented on KAFKA-13936:
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[~mjsax] I looked into the doc section and thought of adding a NOTE under `The
maximum lag in terms of number of records for any partition in this window` .
However if i look for this text in the repository , I see it in the file
FetcherMetricsRegistry.java . Is this where the change is supposed to happen (
and it gets auto generated to html somewhere else ) ? . I don't see a html file
or any markdown document which has this text.
> 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?
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