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https://issues.apache.org/jira/browse/KAFKA-7193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16552795#comment-16552795
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ASF GitHub Bot commented on KAFKA-7193:
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rajinisivaram opened a new pull request #5414: KAFKA-7193: Use ZooKeeper IP
address in streams tests to avoid timeouts
URL: https://github.com/apache/kafka/pull/5414
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.
Use `127.0.0.1` instead of `localhost` in streams tests to avoid intermittent
test failures due to ZK client connection timeouts if ipv6 is chosen in
consecutive address selections.
### Committer Checklist (excluded from commit message)
- [ ] Verify design and implementation
- [ ] Verify test coverage and CI build status
- [ ] Verify documentation (including upgrade notes)
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> 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
> Priority: Major
>
> 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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