Github user trkurc commented on the pull request:
https://github.com/apache/nifi/pull/97#issuecomment-150882926
It looks like due to a bug in hadoop 2.6.0 client code (on a java 8 JVM
only?) your code doesn't try to reload the ticket:
What `checkTGTAndReloginFromKeytab()` does:
```
public synchronized void checkTGTAndReloginFromKeytab() throws
IOException {
if (!isSecurityEnabled()
|| user.getAuthenticationMethod() != AuthenticationMethod.KERBEROS
|| !isKeytab)
return;
```
Here is how isKeyTab is set in 2.6.0
https://github.com/apache/hadoop/blob/release-2.6.0/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/UserGroupInformation.java#L597
This returns false for me, always!
Here is what 2.6.1 is doing
https://github.com/apache/hadoop/blob/e286512a7143427f2975ec92cdc4fad0a093a456/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/UserGroupInformation.java#L623
I'm going to try a java 7 vm.
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