Arjun Satish created KAFKA-7909:
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Summary: Coordinator changes cause Connect integration test to fail
Key: KAFKA-7909
URL: https://issues.apache.org/jira/browse/KAFKA-7909
Project: Kafka
Issue Type: Bug
Affects Versions: 2.2.0
Reporter: Arjun Satish
Fix For: 2.2.0
We recently introduced integration tests in Connect. This test spins up one or
more Connect workers along with a Kafka broker and Zk in a single process and
attempts to move records using a Connector. In the Example Integration Test, we
spin up three workers each hosting a Connector task that consumes records from
a Kafka topic. When the connector starts up, it may go through multiple rounds
of rebalancing. We notice the following two problems in the last few days:
# After members join a group, there are no pendingMembers remaining, but the
join group method does not complete, and send these members a signal that they
are not ready to start consuming from their respective partitions.
# Because of quick rebalances, a consumer might have started a group, but
Connect starts a rebalance, after we which we create three new instances of
the consumer (one from each worker/task). But the group coordinator seems to
have 4 members in the group. This causes the JoinGroup to indefinitely stall.
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