[jira] [Created] (NIFI-6201) Suppress stacktrace on connection refused when NiFi Registry is not running

["Andy LoPresto (JIRA)" <ji...@apache.org>]

Andy LoPresto created NIFI-6201:
-----------------------------------

             Summary: Suppress stacktrace on connection refused when NiFi Registry is not running
                 Key: NIFI-6201
                 URL: https://issues.apache.org/jira/browse/NIFI-6201
             Project: Apache NiFi
          Issue Type: Improvement
          Components: Core Framework, Extensions
    Affects Versions: 1.9.2
            Reporter: Andy LoPresto
            Assignee: Andy LoPresto


When NiFi is running and the flow has a Registry Client configured to connect to the NiFi Registry, but the Registry instance is not running or is not avzailable, long stacktraces are output in the {{nifi-app.log}}. While these events are important, the long stacktraces are unnecessary as the cause is clear -- "Connection refused". These exceptions should be caught and logged properly. 

Sufficient: 
{code}
2019-04-09 19:51:04,100 ERROR [Timer-Driven Process Thread-4] o.a.nifi.groups.StandardProcessGroup Failed to synchronize StandardProcessGroup[identifier=9b59e11e-0169-1000-cb5a-8291e22101f8] with Flow Registry because could not retrieve version 2 of flow with identifier 39ba9057-eaee-4ded-bc61-ce6d4d47d164 in bucket aa2f984d-fca4-4b0b-a5a2-c21b3910d1b6
java.net.ConnectException: Connection refused (Connection refused)
{code}

Unnecessary (current state): 
{code}
2019-04-09 19:53:04,121 ERROR [Timer-Driven Process Thread-8] o.a.nifi.groups.StandardProcessGroup Failed to synchronize StandardProcessGroup[identifier=9b59e11e-0169-1000-cb5a-8291e22101f8] with Flow Registry because could not retrieve version 2 of flow with identifier 39ba9057-eaee-4ded-bc61-ce6d4d47d164 in bucket aa2f984d-fca4-4b0b-a5a2-c21b3910d1b6
java.net.ConnectException: Connection refused (Connection refused)
	at java.net.PlainSocketImpl.socketConnect(Native Method)
	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at java.net.Socket.connect(Socket.java:589)
	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1564)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1492)
	at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
	at org.glassfish.jersey.client.internal.HttpUrlConnector._apply(HttpUrlConnector.java:390)
	at org.glassfish.jersey.client.internal.HttpUrlConnector.apply(HttpUrlConnector.java:282)
	at org.glassfish.jersey.client.ClientRuntime.invoke(ClientRuntime.java:278)
	at org.glassfish.jersey.client.JerseyInvocation.lambda$invoke$1(JerseyInvocation.java:767)
	at org.glassfish.jersey.internal.Errors.process(Errors.java:316)
	at org.glassfish.jersey.internal.Errors.process(Errors.java:298)
	at org.glassfish.jersey.internal.Errors.process(Errors.java:229)
	at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:414)
	at org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:765)
	at org.glassfish.jersey.client.JerseyInvocation$Builder.method(JerseyInvocation.java:428)
	at org.glassfish.jersey.client.JerseyInvocation$Builder.get(JerseyInvocation.java:324)
	at org.apache.nifi.registry.client.impl.JerseyFlowSnapshotClient.lambda$get$1(JerseyFlowSnapshotClient.java:104)
	at org.apache.nifi.registry.client.impl.AbstractJerseyClient.executeAction(AbstractJerseyClient.java:71)
	at org.apache.nifi.registry.client.impl.JerseyFlowSnapshotClient.get(JerseyFlowSnapshotClient.java:97)
	at org.apache.nifi.registry.flow.RestBasedFlowRegistry.getFlowContents(RestBasedFlowRegistry.java:206)
	at org.apache.nifi.registry.flow.RestBasedFlowRegistry.getFlowContents(RestBasedFlowRegistry.java:220)
	at org.apache.nifi.groups.StandardProcessGroup.synchronizeWithFlowRegistry(StandardProcessGroup.java:3258)
	at org.apache.nifi.controller.FlowController$5.run(FlowController.java:820)
	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.runAndReset(FutureTask.java:308)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
	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}



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