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https://issues.apache.org/jira/browse/NIFI-9828?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Pierre Villard resolved NIFI-9828.
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Resolution: Feedback Received
Apache NiFi 1.x is no longer maintained and no new release is planned on the
1.x release line. Marking as resolved as part of a cleanup operation. Please
open a new one with an updated description if this is still relevant for NiFi
2.x.
> Apache NiFi 1.15.3 - Load balancing error on one cluster node due to
> java.net.UnknownHostException: null
> --------------------------------------------------------------------------------------------------------
>
> Key: NIFI-9828
> URL: https://issues.apache.org/jira/browse/NIFI-9828
> Project: Apache NiFi
> Issue Type: Bug
> Affects Versions: 1.15.3
> Reporter: Emanuele Costantini
> Priority: Major
>
> I have a 11 nodes NiFi cluster. Each node can correctly communicate to each
> other.
> However when the other nodes try to connect to a node 021 for load balancing,
> the following error occurs:
>
> {code:java}
> ERROR [Load-Balanced Client Thread-8]
> o.a.n.c.q.c.c.a.n.NioAsyncLoadBalanceClient Unable to connect to
> as021dos.intranet.fw:18090 for load balancing
> java.net.UnknownHostException: null
> at sun.nio.ch.Net.translateException(Net.java:154)
> at sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:127)
> at sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:80)
> at
> org.apache.nifi.controller.queue.clustered.client.async.nio.NioAsyncLoadBalanceClient.createChannel(NioAsyncLoadBalanceClient.java:496)
> at
> org.apache.nifi.controller.queue.clustered.client.async.nio.NioAsyncLoadBalanceClient.establishConnection(NioAsyncLoadBalanceClient.java:439)
> at
> org.apache.nifi.controller.queue.clustered.client.async.nio.NioAsyncLoadBalanceClient.communicate(NioAsyncLoadBalanceClient.java:234)
> at
> org.apache.nifi.controller.queue.clustered.client.async.nio.NioAsyncLoadBalanceClientTask.run(NioAsyncLoadBalanceClientTask.java:81)
> at org.apache.nifi.engine.FlowEngine$2.run(FlowEngine.java:110)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748){code}
> The error can be seen on all nodes and only towards the node 021.
>
> Load balancing properties are the following on ALL nodes (actual ip address
> instead of "ipv4_address"):
> {code:java}
> nifi.cluster.load.balance.host=ipv4_address
> nifi.cluster.load.balance.port=6342
> nifi.cluster.load.balance.connections.per.node=4
> nifi.cluster.load.balance.max.thread.count=8
> nifi.cluster.load.balance.comms.timeout=30 sec{code}
> While 18090, which is the port appearing in the error, is the HTTPS port.
> Any idea on why does the error raise? And why does it appear just towards one
> node?
> Thanks
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