[jira] [Created] (KAFKA-7909) Coordinator changes cause Connect integration test to fail

["Arjun Satish (JIRA)" <ji...@apache.org>]

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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