Narayan Periwal created KAFKA-6681:
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Summary: Two instances of kafka consumer reading the same
partition within a consumer group
Key: KAFKA-6681
URL: https://issues.apache.org/jira/browse/KAFKA-6681
Project: Kafka
Issue Type: Bug
Components: consumer
Affects Versions: 0.10.2.1
Reporter: Narayan Periwal
We have seen this issue with the Kafka consumer, the new library that got
introduced in 0.9
With this new client, the group management is done by kafka coordinator, which
is one of the kafka broker.
We are using Kafka broker 0.10.2.1 and consumer client version is also 0.10.2.1
The issue that we have faced is that, after rebalancing, some of the partitions
gets consumed by 2 instances within a consumer group, leading to duplication of
the entire partition data. They continue to read until the next rebalancing, or
the restart of those clients.
It looks like that a particular consumer goes on fetching the data from a
partition, but the broker is not able to identify this "stale" consumer
instance.
During this time, we also see the underreplicated partition metrics spiking.
We have hit this twice in production. Please look at it the earliest.
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