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From Nitay Kufert <nita...@ironsrc.com>
Subject Consumer loses partition offset and resets post 2.4.1 version upgrade
Date Sun, 05 Apr 2020 17:13:25 GMT
> Hey,

We are using kafka streams across our tech stack for the last 2-3 years.

Lately, we moved to kafka 2.4.1 and we started noticing a troubling
behaviour that we didn't see before:

Without apparent reason, a specific partition on a specific consumer loses
its offset, with the following messages appearing on the consumer:

> [Consumer clientId=consumer-XConsumerGroup4-2, groupId=XConsumerGroup4]
> Fetch offset 1222791071 is out of range for partition SomeTopic-48,
> resetting offset:
 [Consumer clientId=consumer-XConsumerGroup4-2, groupId=XConsumerGroup4]
> Resetting offset for partition SomeTopic-48 to offset 1216430527.:

from the broker, the only thing i could find is:

> BrokerId 1033 is no longer a coordinator for the group XConsumerGroup4. Proceeding cleanup
for other alive groups
Another way to see the same thing, from our monitoring (DD):
[image: Screen Shot 2020-04-05 at 16.32.19.png]

The recovery you are seeing is after I run partition offset reset manually
(using kafka-consumer-groups.sh --bootstrap-server localhost:9092 --topic
SomeTopic:57 --group XConsumerGroup4 --reset-offsets --to-datetime

Any idea what can be causing this? we have it happen to us at least 5 times
since the upgrade, and before that i don't remember it even happening to us.

Let me know if you need more data from me

Nitay Kufert
Backend Team Leader
[image: ironSource] <http://www.ironsrc.com>

email nitay.k@ironsrc.com
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