[jira] [Created] (NIFI-1734) Confusing warning thrown when DNS issues occur on a system with a NCM running

["David A. Wynne (JIRA)" <ji...@apache.org>]

David A. Wynne created NIFI-1734:
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             Summary: Confusing warning thrown when DNS issues occur on a system with a NCM running
                 Key: NIFI-1734
                 URL: https://issues.apache.org/jira/browse/NIFI-1734
             Project: Apache NiFi
          Issue Type: Bug
            Reporter: David A. Wynne
            Priority: Minor


If a system with a NiFi NCM instance running has a DNS issue, the first error message thrown is correct, but the subsequent warning message lead the user to believe it is a firewall issue, thus confusing the user and leading to an inaccurate assessment of the issue.

First error when DNS issue occurs:
2016-04-05 14:07:46,488 ERROR [Process Pending Heartbeats] o.a.n.c.manager.impl.WebClusterManager Failed to process heartbeat from i-81556e02.dev.aws.lifelock.ad:8081 due to org.apache.nifi.cluster.protocol.ProtocolException: Failed to create socket due to: java.net.UnknownHostException: i-81556e02.dev.aws.lifelock.ad

The next warning thrown:
2016-04-05 14:07:46,488 WARN [Heartbeat Monitor] o.a.n.c.f.i.FileBasedClusterNodeFirewall Blocking unknown host 'i-81556e02.dev.aws.lifelock.ad' 
java.net.UnknownHostException: i-81556e02.dev.aws.lifelock.ad 



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