Wouter Bancken created KAFKA-6557:
Summary: Kafka Consumer Offsets are unavailable during rebalancing
Issue Type: Bug
Affects Versions: 1.0.0
Reporter: Wouter Bancken
Using the kafka-consumer-groups tool to fetch the consumer offsets, the offsets
seem to be unavailable during rebalancing. During the rebalancing, the consumer
group has no partition assignments.
1. I have a consumer group 'X' subscribed to topics 'A' and 'B' with partition
assignments and lag information. Consumer group 'X' is "Stable".
2a. Topic 'C' is (being) created.2b. During this creation, I do not have a
partition assignment for consumer group 'X' for topics 'A' and 'B' but the
consumer group is still "Stable".
3. A second later: I have a partition assignment for consumer group 'X' for
topics 'A' and 'B' again and the consumer group is still "Stable".
I at least expected the state of consumer group 'X' during step 2b to be
"PreparingRebalance" or "AwaitingSync". Otherwise there is no way to detect
that the consumer is rebalancing.
See the [discussion on the 'users'
for additional information.
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