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https://issues.apache.org/jira/browse/SAMZA-2295?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bharath Kumarasubramanian reassigned SAMZA-2295:
------------------------------------------------
Assignee: Bharath Kumarasubramanian
> records-lag based topic metrics not working for topics with periods (dot,
> '.') in them
> --------------------------------------------------------------------------------------
>
> Key: SAMZA-2295
> URL: https://issues.apache.org/jira/browse/SAMZA-2295
> Project: Samza
> Issue Type: Bug
> Components: kafka
> Affects Versions: 1.2
> Reporter: Thunder Stumpges
> Assignee: Bharath Kumarasubramanian
> Priority: Major
> Time Spent: 20m
> Remaining Estimate: 0h
>
> After upgrading to Samza 1.2, the samza metrics {{high-watermark}} and
> {{messages-behind-high-watermark}} stopped updating. With a bit of digging,
> this was traced to our use of dot in our kafka topic names.
> It looks like kafka refactored their metrics names significantly, and moved
> the topic name out of the metric name and into tags. When doing this, they
> added a replacement of '.' -> '_'. When Samza refactored to match this, the
> same replacement was not made, so the lookup of the "records-lag" metric in
> KafkaConsumerProxy fails to find a match.
> The commit on kafka is here:
> [https://github.com/apache/kafka/commit/5d81639907869ce7355c40d2bac176a655e52074#diff-b45245913eaae46aa847d2615d62cde0R1331]
>
> The related commit on Samza is here:
> [https://github.com/apache/samza/commit/01c06055057e8c260e73bf3f7db7b9eb53af3745#diff-b56db493dfdd2fd2d471f6df342fe661R400]
>
> The fix is a simple replacement added to the line above. Pull request coming
> shortly.
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