Rajini Sivaram created KAFKA-7193:
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Summary: ZooKeeper client times out with localhost due to random
choice of ipv4/ipv6
Key: KAFKA-7193
URL: https://issues.apache.org/jira/browse/KAFKA-7193
Project: Kafka
Issue Type: Bug
Components: zkclient
Affects Versions: 2.0.0
Reporter: Rajini Sivaram
Assignee: Rajini Sivaram
ZooKeeper client from version 3.4.13 doesn't handle connections to `localhost`
very well. If ZooKeeper is started on 127.0.0.1 on a machine that has both ipv4
and ipv6 and a client is created using `localhost` rather than the IP address
in the connection string, ZooKeeper client attempts to connect to ipv4 or ipv6
randomly with a fixed one second backoff if connection fails. With the default
6 second connection timeout in Kafka, this can result in client connection
failures if ipv6 is chosen in consecutive address selections.
Streams tests are failing intermittently as a result of this.
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