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From "James Cheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-5890) records.lag should use tags for topic and partition rather than using metric name.
Date Sat, 16 Sep 2017 01:33:01 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-5890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16168759#comment-16168759

James Cheng commented on KAFKA-5890:

I noticed the same thing in https://github.com/apache/kafka/pull/2993

Metric names are a public API, and so would require a KIP before changes could be made. Is
that something you want to take on?

> records.lag should use tags for topic and partition rather than using metric name.
> ----------------------------------------------------------------------------------
>                 Key: KAFKA-5890
>                 URL: https://issues.apache.org/jira/browse/KAFKA-5890
>             Project: Kafka
>          Issue Type: Bug
>          Components: clients
>    Affects Versions:
>            Reporter: Charly Molter
> As part of KIP-92[1] a per partition lag metric was added.
> These metrics are really useful, however in the implementation  it was implemented as
a prefix to the metric name: https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/clients/consumer/internals/Fetcher.java#L1321-L1344
> Usually these kind of metrics use tags and the name is constant for all topics, partitions.
> We have a custom reporter which aggregates topics/partitions together to avoid explosion
of the number of KPIs and this KPI doesn't support this as it doesn't have tags but a complex
> [1] https://cwiki.apache.org/confluence/display/KAFKA/KIP-92+-+Add+per+partition+lag+metrics+to+KafkaConsumer

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