UI Not Responsive

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UI Not Responsive

Karthik Kothareddy (karthikk) [CONT - Type 2]
All,

I am currently running NiFi 1.2.0 on a Linux(RHEL) machine. Everything was running fine until yesterday where it started behaving weird. The UI is not at all responsive and sometimes the page wouldn't even load. I bumped up the Java Heap Space just to make sure I'm not overloading the system to a point where I cannot load the UI. I looked at the nifi-bootstrap.log and it says the instance is running

INFO [main] org.apache.nifi.bootstrap.Command Apache NiFi is currently running, listening to Bootstrap on port 54224, PID=41602

However, in the nifi-app.log I find something interesting, the trace is as below and I keep getting this warning almost every 5-10 seconds in the log

2017-07-05 20:00:02,032 WARN [NiFi Web Server-16-acceptor-0@6fecd17b-ServerConnector@2222a852{SSL,[ssl, http/1.1]}{server-name:8443}] o.eclipse.jetty.server.AbstractConnector
java.nio.channels.ClosedSelectorException: null
               at sun.nio.ch.SelectorImpl.keys(SelectorImpl.java:68) ~[na:1.8.0_101]
               at org.eclipse.jetty.io.ManagedSelector.size(ManagedSelector.java:104) ~[jetty-io-9.3.9.v20160517.jar:9.3.9.v20160517]
               at org.eclipse.jetty.io.SelectorManager.chooseSelector(SelectorManager.java:190) ~[jetty-io-9.3.9.v20160517.jar:9.3.9.v20160517]
               at org.eclipse.jetty.io.SelectorManager.accept(SelectorManager.java:232) ~[jetty-io-9.3.9.v20160517.jar:9.3.9.v20160517]
               at org.eclipse.jetty.io.SelectorManager.accept(SelectorManager.java:217) ~[jetty-io-9.3.9.v20160517.jar:9.3.9.v20160517]
               at org.eclipse.jetty.server.ServerConnector.accepted(ServerConnector.java:383) ~[jetty-server-9.3.9.v20160517.jar:9.3.9.v20160517]
               at org.eclipse.jetty.server.ServerConnector.accept(ServerConnector.java:374) ~[jetty-server-9.3.9.v20160517.jar:9.3.9.v20160517]
               at org.eclipse.jetty.server.AbstractConnector$Acceptor.run(AbstractConnector.java:593) ~[jetty-server-9.3.9.v20160517.jar:9.3.9.v20160517]
               at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671) [jetty-util-9.3.9.v20160517.jar:9.3.9.v20160517]
               at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589) [jetty-util-9.3.9.v20160517.jar:9.3.9.v20160517]
               at java.lang.Thread.run(Thread.java:745) [na:1.8.0_101]

Does anyone have similar problems in launching the UI? any help around this is appreciated.


Thanks
Karthik