Github user mattyb149 commented on the issue:
https://github.com/apache/nifi/pull/3086
Same here, the relevant error in the Travis log is "Cannot locate default
realm". Looking at other tests that load krb5.conf, one
(TestHBase_1_1_2_ClientService) has this:
```
// needed for calls to UserGroupInformation.setConfiguration() to work when
passing in
// config with Kerberos authentication enabled
System.setProperty("java.security.krb5.realm", "nifi.com");
System.setProperty("java.security.krb5.kdc", "nifi.kdc");
```
and another (TestRangerNiFiAuthorizer) has this:
```
// have to initialize this system property before anything else
File krb5conf = new File("src/test/resources/krb5.conf");
assertTrue(krb5conf.exists());
System.setProperty("java.security.krb5.conf", krb5conf.getAbsolutePath());
```
Perhaps one or both of these would fix the issue? Not sure how to
reproduce, I guess you could try one and push the commit to see if Travis
succeeds...
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