Critical Description
HandleHttpRequest randomly enters in a fault state and does not recover until I restart the node. I feel the problem is triggered when some exception occurs (ex.: broken request, connection issues, etc), but I am usually able to reproduce this behavior stressing the node with tons of simultaneous requests:
# example script to stress server
for i in `seq 1 10000`; do
wget ‐T10 ‐t10 ‐qO‐ 'http://127.0.0.1:64080/'>/dev/null &
done
When this happens, HandleHttpRequest start to return "HTTP ERROR 503 - Service Unavailable" and does not recover from this state:
If I try to stop the HandleHttpRequest processor, the running threads does not terminate:
If I force them to terminate, the listen port continue being bound by NiFi:
If I try to connect again, I got a HTTP ERROR 500:
If I try to start the HandleHttpRequest processor again, it doesn't start with the message:
- ERROR [Timer-Driven Process Thread-11] o.a.n.p.standard.HandleHttpRequest HandleHttpRequest[id=9bae326b-5ac3-3e9f-2dac-c0399d8f2ddb] Failed to process session due to org.apache.nifi.processor.exception.ProcessException: Failed to initialize the server: org.apache.nifi.processor.exception.ProcessException: Failed to initialize the server{{ org.apache.nifi.processor.exception.ProcessException: Failed to initialize the server}}{{ {{ at org.apache.nifi.processors.standard.HandleHttpRequest.onTrigger(HandleHttpRequest.java:501)}}}}{{ {{ at org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)}}}}{{ {{ at org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1165)}}}}{{ {{ at org.apache.nifi.controller.tasks.ConnectableTask.invoke(ConnectableTask.java:203)}}}}{{ {{ at org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:117)}}}}{{ {{ at java.util.concurrent.Executors$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)}}}}{{ Caused by: java.net.BindException: Address already in use}}{{ {{ at sun.nio.ch.Net.bind0(Native Method)}}}}{{ {{ at sun.nio.ch.Net.bind(Net.java:433)}}}}{{ {{ at sun.nio.ch.Net.bind(Net.java:425)}}}}{{ {{ at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)}}}}{{ {{ at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)}}}}{{ {{ at org.eclipse.jetty.server.ServerConnector.open(ServerConnector.java:298)}}}}{{ {{ at org.eclipse.jetty.server.AbstractNetworkConnector.doStart(AbstractNetworkConnector.java:80)}}}}{{ {{ at org.eclipse.jetty.server.ServerConnector.doStart(ServerConnector.java:236)}}}}{{ {{ at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)}}}}{{ {{ at org.eclipse.jetty.server.Server.doStart(Server.java:431)}}}}{{ {{ at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)}}}}{{ {{ at org.apache.nifi.processors.standard.HandleHttpRequest.initializeServer(HandleHttpRequest.java:430)}}}}{{ {{ at org.apache.nifi.processors.standard.HandleHttpRequest.onTrigger(HandleHttpRequest.java:489)}} { Unknown macro:
{ ... 11 common frames omitted}
}}}
The only way to workaround this when it happens is chaging the port it listens to or restarting NiFi service. I flagged this as a security issue because it allows someone to cause a DoS to the service.
I found several similar issues, but most of them are related with old versions, I am can confirm this affects versions 1.7.0 and 1.7.1.
