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https://issues.apache.org/jira/browse/NIFI-2944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15794095#comment-15794095
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ASF GitHub Bot commented on NIFI-2944:
--------------------------------------
Github user alopresto commented on the issue:
https://github.com/apache/nifi/pull/1379
I reviewed this (added a little bit more explanation to the error message
and some unit test cases for empty string or missing remote input host values),
ran all the tests, and merged.
> Validate the configured remote input hostname
> ---------------------------------------------
>
> Key: NIFI-2944
> URL: https://issues.apache.org/jira/browse/NIFI-2944
> Project: Apache NiFi
> Issue Type: Improvement
> Affects Versions: 1.0.0
> Reporter: Joseph Percivall
> Assignee: Pierre Villard
> Priority: Minor
>
> Currently NiFi doesn't do any validation on what is set for
> "nifi.remote.input.host". For example, I ran across 1 node cluster configured
> with a remote input hostname that started with a "http:// ...". This cluster
> started up and everything seemed fine on it's end but on the client side it
> failed.
> After the initial connection it received "http:// ..." as the hostname for it
> to connect to causing UnknownHostExceptions.
> NiFi should validate that the value set for the remote input host is valid in
> order to avoid this issue.
> Example:
> 2016-10-25 11:18:29,132 ERROR [Timer-Driven Process Thread-6]
> o.a.nifi.remote.StandardRemoteGroupPort RemoteGroupPort[name=From
> MiNiFi,target=http://<HOSTNAME>:9090/nifi/] failed to communicate with
> http://<HOSTNAME>:9090/nifi/ due to java.net.UnknownHostException
> 2016-10-25 11:18:29,136 ERROR [Timer-Driven Process Thread-6]
> o.a.nifi.remote.StandardRemoteGroupPort
> java.net.UnknownHostException: null
> at sun.nio.ch.Net.translateException(Net.java:155) ~[na:1.8.0_74]
> at sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:127) ~[na:1.8.0_74]
> at
> org.apache.nifi.remote.client.socket.EndpointConnectionPool.establishSiteToSiteConnection(EndpointConnectionPool.java:712)
> ~[nifi-site-to-site-client-0.6.1.jar:0.6.1]
> at
> org.apache.nifi.remote.client.socket.EndpointConnectionPool.establishSiteToSiteConnection(EndpointConnectionPool.java:685)
> ~[nifi-site-to-site-client-0.6.1.jar:0.6.1]
> at
> org.apache.nifi.remote.client.socket.EndpointConnectionPool.getEndpointConnection(EndpointConnectionPool.java:301)
> ~[nifi-site-to-site-client-0.6.1.jar:0.6.1]
> at
> org.apache.nifi.remote.client.socket.SocketClient.createTransaction(SocketClient.java:129)
> ~[nifi-site-to-site-client-0.6.1.jar:0.6.1]
> at
> org.apache.nifi.remote.StandardRemoteGroupPort.onTrigger(StandardRemoteGroupPort.java:171)
> ~[nifi-site-to-site-0.6.1.jar:0.6.1]
> at org.apache.nifi.controller.AbstractPort.onTrigger(AbstractPort.java:227)
> [nifi-framework-core-api-0.6.1.jar:0.6.1]
> at
> org.apache.nifi.controller.tasks.ContinuallyRunConnectableTask.call(ContinuallyRunConnectableTask.java:81)
> [nifi-framework-core-0.6.1.jar:0.6.1]
> at
> org.apache.nifi.controller.tasks.ContinuallyRunConnectableTask.call(ContinuallyRunConnectableTask.java:40)
> [nifi-framework-core-0.6.1.jar:0.6.1]
> at
> org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:123)
> [nifi-framework-core-0.6.1.jar:0.6.1]
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> [na:1.8.0_74]
> at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
> [na:1.8.0_74]
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
> [na:1.8.0_74]
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
> [na:1.8.0_74]
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> [na:1.8.0_74]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> [na:1.8.0_74]
> at java.lang.Thread.run(Thread.java:745) [na:1.8.0_74]
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