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Posted to dev@kafka.apache.org by "Rajini Sivaram (JIRA)" <ji...@apache.org> on 2018/07/23 12:37:00 UTC

[jira] [Created] (KAFKA-7193) ZooKeeper client times out with localhost due to random choice of ipv4/ipv6

Rajini Sivaram created KAFKA-7193:
-------------------------------------

             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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