Pfthb

I am facing a very weird issue.

This error is coming randomly in "EvaluateJsonPath 1.6.0" processor. I have 3 instance of this processor in my workflow. Error randomly comes, its not coming at same place.

Sometime flow runs fine (very rarely). this error frequent enough, but location of error is random.

flow is like this => fire http url -> eval result Json -> get more URL -> call those http urls -> do eval -> wait -> merge all the result -> write to fs -> end

wait part of code waits for approx 30 min.

each relation has enough buffer (5 gb, 100000 ff). and I can see no back pressure.

system has enough memory remaining. also jvm is running with 28gb heap.

I am on v 1.6.0

What may be the reason? is some background process, cleaning up the file, before process is releasing it?

is it possible, I may have configured some optimization which is compelling nifi to clean content folder?
its not like, content folder is empty, it still has old files in it, so cant be that.

I am really confused.

I can see following stack trace

`

2018-11-14 12:04:04,120 ERROR [Timer-Driven Process Thread-2] o.a.n.p.standard.EvaluateJsonPath EvaluateJsonPath[id=d9d338ca-5396-3f8c-e134-753aacda1ca6] EvaluateJsonPath[id=d9d338ca-5396-3f8c-e134-753aacda1ca6] failed to process session due to org.apache.nifi.processor.exception.MissingFlowFileException: Unable to find content for FlowFile; Processor Administratively Yielded for 1 sec: org.apache.nifi.processor.exception.MissingFlowFileException: Unable to find content for FlowFile
org.apache.nifi.processor.exception.MissingFlowFileException: Unable to find content for FlowFile
 at org.apache.nifi.controller.repository.StandardProcessSession.handleContentNotFound(StandardProcessSession.java:3104)
 at org.apache.nifi.controller.repository.StandardProcessSession.read(StandardProcessSession.java:2228)
 at org.apache.nifi.controller.repository.StandardProcessSession.read(StandardProcessSession.java:2175)
 at org.apache.nifi.processors.standard.AbstractJsonPathProcessor.validateAndEstablishJsonContext(AbstractJsonPathProcessor.java:77)
 at org.apache.nifi.processors.standard.EvaluateJsonPath.onTrigger(EvaluateJsonPath.java:271)
 at org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
 at org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1147)
 at org.apache.nifi.controller.tasks.ConnectableTask.invoke(ConnectableTask.java:175)
 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: org.apache.nifi.controller.repository.ContentNotFoundException: Could not find content for StandardContentClaim [resourceClaim=StandardResourceClaim[id=1542197040430-4449, container=default, section=353], offset=844526, length=142607]
 at org.apache.nifi.controller.repository.StandardProcessSession.getInputStream(StandardProcessSession.java:2167)
 at org.apache.nifi.controller.repository.StandardProcessSession.read(StandardProcessSession.java:2192)
 ... 14 common frames omitted
Caused by: java.io.EOFException: null
 at org.apache.nifi.stream.io.StreamUtils.skip(StreamUtils.java:242)
 at org.apache.nifi.controller.repository.FileSystemRepository.read(FileSystemRepository.java:859)
 at org.apache.nifi.controller.repository.StandardProcessSession.getInputStream(StandardProcessSession.java:2135)
 ... 15 common frames omitted

`