[CASSANDRA-15622] Unit tests throw UnknownHostException trying to use `InetAddress.getLocalHost()` instead of `FBUtilities.getLocalAddress()`

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 2.2.17, 3.0.21, 3.11.7, 4.0-alpha4, 4.0
• Component/s: Test/unit
• Bug Category: Correctness - Test Failure
• Severity: Normal
• Complexity: Low Hanging Fruit
• Discovered By: Unit Test
• Platform: All
• Since Version: 0.3

Source Control Link

https://github.com/apache/cassandra/commit/a8ef9c9ad1495f3eb9dc1ef09c0995926561fd8c

Test and Documentation Plan

Jenkins test pass rate (significantly) improving.

• Assignee: Michael Semb Wever
• Reporter: Michael Semb Wever

Authors

Michael Semb Wever

Reviewers

Benjamin Lerer

• Created: 04/Mar/20 19:03
• Updated: 15/May/20 08:54
• Resolved: 11/Mar/20 16:44

Description

Many of the unit tests in Jenkins fail because of the use of `InetAddress.getLocalHost()` in the test classes.

The Jenkins agents need a public ipaddress (and a hostname associated to it) so the Jenkins master can connect to them (agents can be hosted externally, by donating third-parties).

The call to `InetAddress.getLocalHost()` can resolve to a hostname that can't be looked up.
Not only can it not be listed in `/etc/hosts`, but we don't want it to be either (in case of accidental external port opening if the hostname points to the public ipaddress). (Which is also ASF policy on this infrastructure.)

The unit test code needs to replace these code occurrences with the call to `FBUtilities.getLocalAddress()`