Hello,
In updating our Nifi setup to 1.4.0, one of our regression tests started to
fail.
On investigation I ran into an issue with FlowFile state that has confused
me.
The following processor takes an input flow file, writes "NEW_DATA" to it,
the clones it.
It then outputs the original flowFile and the clone to different output
relationships.
I had expected that the two outputs would be the same, but if I run this
through (using GenerateFlowFile to generate input), I get different output.
If I play in data "OLD", then:
OutputA receives a flowFile with the written content "NEW_DATA".
OutputB receives the original content "OLD" that was sent into the
processor.
If instead I play in data longer than 8 bytes (ie longer than "NEW_DATA"),
then CloneTestProcess errors and yields.
The error from the logs is below.
Any advice would be appreciated.
Thanks in advance,
Matthew Watson
Code:
public class CloneTestProcessor extends AbstractProcessor {
public static final Relationship OUTPUT_A = new
Relationship.Builder().name("OUTPUT_A").build();
public static final Relationship OUTPUT_B = new
Relationship.Builder().name("OUTPUT_B").build();
@Override
public Set<Relationship> getRelationships() {
return ImmutableSet.of(OUTPUT_A, OUTPUT_B);
}
@Override
public void onTrigger(ProcessContext context, ProcessSession
session) throws ProcessException {
String DATA = "NEW_DATA";
FlowFile flowFile = session.get();
if(flowFile == null) {
return;
}
FlowFile output = session.write(flowFile, (in, out) -> {
out.write(DATA.getBytes());
});
FlowFile other = session.clone(flowFile);
session.transfer(flowFile, OUTPUT_A);
session.transfer(other, OUTPUT_B);
}
}
Error:
2017-11-22 16:56:19,326 WARN [Timer-Driven Process Thread-10]
o.a.n.c.t.ContinuallyRunProcessorTask
org.apache.nifi.processor.exception.FlowFileHandlingException: Specified
offset of 0 and size 9 exceeds size of
StandardFlowFileRecord[uuid=5d279723-64a3-4ad2-a8f6-3f974baf38ce,claim=StandardContentClaim
[resourceClaim=StandardResourceClaim[id=1511369750666-1, container=default,
section=1], offset=51, length=8],offset=0,name=29102663649743,size=8]
at
org.apache.nifi.controller.repository.StandardProcessSession.clone(StandardProcessSession.java:1672)
at
org.apache.nifi.controller.repository.StandardProcessSession.clone(StandardProcessSession.java:1662)
at
com.baesystemsai.nifi.utility.CloneTestProcessor.onTrigger(CloneTestProcessor.java:59)
at
org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
at
org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1119)
at
org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:147)
at
org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:47)
at
org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:128)
at
java.util.concurrent.Executors$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:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
