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https://issues.apache.org/jira/browse/NIFI-871?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16003088#comment-16003088
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Mark Payne commented on NIFI-871:
---------------------------------
[~trixpan] - no, this does not appear to be resolved. I just tested against
master. To recreate, create a standalone NiFi instance and in
conf/nifi.properties set the "nifi.remote.input.host" property to "otherhost"
and set the "nifi.remote.input.port" property to whatever port you'd like. Then
start NiFi and create a RemoteProcessGroup that points to
http://localhost:8080/nifi (or whatever your URL is). It will establish the
connection and discover input ports correctly. However, when you attempt to
push the data, it will error with the following message:
{code}
2017-05-09 13:12:53,523 ERROR [Timer-Driven Process Thread-3]
o.a.nifi.remote.StandardRemoteGroupPort
RemoteGroupPort[name=in,targets=http://localhost:8080/nifi] failed to
communicate with http://localhost:8080/nifi due to java.net.UnknownHostException
{code}
This is incorrect because it appears that localhost is the Unknown Host. In
reality, it was attempting to communicate with 'otherhost' and that is the
unknown host.
> Site-to-Site does not report the actual hostname that it was trying to
> connect to when it fails to connect
> ----------------------------------------------------------------------------------------------------------
>
> Key: NIFI-871
> URL: https://issues.apache.org/jira/browse/NIFI-871
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Reporter: Mark Payne
> Assignee: Andre F de Miranda
>
> In testing the patch provided for NIFI-868, I set the nifi properties to
> advertise the hostname as "otherhost". Site-to-Site, of course, failed to
> connect, but rather indicating that it could not connect to otherhost, it
> simply indicated that it was the RemoteProcessGroup connected to
> http://localhost:8080/nifi. This is misleading because it leads the user to
> believe that the Remote Process Group is having trouble connecting to
> localhost, when in reality it is attempting to connect to "otherhost". We
> should indicate which host we are connecting to when providing an error like
> this.
> 2015-08-19 13:03:46,083 WARN [Timer-Driven Process Thread-10]
> o.a.n.c.t.ContinuallyRunConnectableTask
> RemoteGroupPort[name=in,target=http://localhost:8080/nifi] Administratively
> Pausing for 10 seconds due to processing failure: java.lang.RuntimeException:
> java.nio.channels.UnresolvedAddressException
> java.lang.RuntimeException: java.nio.channels.UnresolvedAddressException
> at
> org.apache.nifi.controller.AbstractPort.onTrigger(AbstractPort.java:234)
> ~[nifi-framework-core-api-0.3.0-SNAPSHOT.jar:0.3.0-SNAPSHOT]
> at
> org.apache.nifi.controller.tasks.ContinuallyRunConnectableTask.call(ContinuallyRunConnectableTask.java:80)
> [nifi-framework-core-0.3.0-SNAPSHOT.jar:0.3.0-SNAPSHOT]
> at
> org.apache.nifi.controller.tasks.ContinuallyRunConnectableTask.call(ContinuallyRunConnectableTask.java:40)
> [nifi-framework-core-0.3.0-SNAPSHOT.jar:0.3.0-SNAPSHOT]
> at
> org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:119)
> [nifi-framework-core-0.3.0-SNAPSHOT.jar:0.3.0-SNAPSHOT]
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> [na:1.8.0_51]
> at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
> [na:1.8.0_51]
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
> [na:1.8.0_51]
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
> [na:1.8.0_51]
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> [na:1.8.0_51]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> [na:1.8.0_51]
> at java.lang.Thread.run(Thread.java:745) [na:1.8.0_51]
> Caused by: java.nio.channels.UnresolvedAddressException: null
> at sun.nio.ch.Net.checkAddress(Net.java:123) ~[na:1.8.0_51]
> at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:622)
> ~[na:1.8.0_51]
> at java.nio.channels.SocketChannel.open(SocketChannel.java:189)
> ~[na:1.8.0_51]
> at
> org.apache.nifi.remote.client.socket.EndpointConnectionPool.establishSiteToSiteConnection(EndpointConnectionPool.java:708)
> ~[nifi-site-to-site-client-0.3.0-SNAPSHOT.jar:0.3.0-SNAPSHOT]
> at
> org.apache.nifi.remote.client.socket.EndpointConnectionPool.establishSiteToSiteConnection(EndpointConnectionPool.java:682)
> ~[nifi-site-to-site-client-0.3.0-SNAPSHOT.jar:0.3.0-SNAPSHOT]
> at
> org.apache.nifi.remote.client.socket.EndpointConnectionPool.getEndpointConnection(EndpointConnectionPool.java:300)
> ~[nifi-site-to-site-client-0.3.0-SNAPSHOT.jar:0.3.0-SNAPSHOT]
> at
> org.apache.nifi.remote.client.socket.SocketClient.createTransaction(SocketClient.java:129)
> ~[nifi-site-to-site-client-0.3.0-SNAPSHOT.jar:0.3.0-SNAPSHOT]
> at
> org.apache.nifi.remote.StandardRemoteGroupPort.onTrigger(StandardRemoteGroupPort.java:167)
> ~[nifi-site-to-site-0.3.0-SNAPSHOT.jar:0.3.0-SNAPSHOT]
> at
> org.apache.nifi.controller.AbstractPort.onTrigger(AbstractPort.java:227)
> ~[nifi-framework-core-api-0.3.0-SNAPSHOT.jar:0.3.0-SNAPSHOT]
> ... 10 common frames omitted
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