linkedin / linkedin/Burrow

offset are null and current lag is 0

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Description

Hi,

I have a 0.10.2.1 kafka cluster and built from head today and there are some consumer_groups that always report null for all of their partitions:

```
"current-lag": 0,
"owner": "/10.1.17.218",
"offsets": [
null,
null,
null,
null,
null,
null,
null,
null,
null,
```

In Kafka Manager the log size is 0 and the consumer offset is either 0 or -1. Screenshot below. What am I supposed to be doing here? Why is Burrow sending emails? My threshold is set to '3', is my only recourse to blacklist this consumer group for now?

screen shot 2018-02-01 at 12 26 27 am

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Research direction

No source file or test is named. Reproduce the null offsets and zero current lag with the reported Kafka 0.10.2.1 cluster, then trace the consumer-group offset handling. Done means the alert behavior is explained and corrected or the expected handling is documented.

Written by the indexing model from the issue text.

Assessment

Tech stack
go
Domain
observability
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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