This error occurred in NiFi 1.1.1 (single node) right after an upgrade from
1.1.0, so I thought it was due to the upgrade, but now I see that it happens
if I restart as well and there is data in the flow. 

This MergeContent processor is sorting incoming FlowFiles into bins based on
a correlation attribute and dumping out the accumulated uber-FlowFile after
one hour or 500K messages are accumulated.

Questions:
(1) Should I clear out all the flow files from the flow (terminate intake
and let everything drain out)?
(2) Will data be lost when this error occurs?

Error:
-------
2017-01-11 10:53:39,561 WARN [Timer-Driven Process Thread-9]
o.a.n.processors.standard.MergeContent
MergeContent[id=b9898788-1c11-45d9-8646-44b1dceb92d5] Processor
Administratively Yielded for 1 sec due to processing failure
2017-01-11 10:53:39,561 WARN [Timer-Driven Process Thread-9]
o.a.n.c.t.ContinuallyRunProcessorTask Administratively Yielding
MergeContent[id=b9898788-1c11-45d9-8646-44b1dceb92d5] due to uncaught
Exception: org.apache.nifi.processor.exception.FlowFileHandlingException:
StandardFlowFileRecord[uuid=07f3d75a-3347-45da-8dd4-fecf775d1dcf,claim=StandardContentClaim
[resourceClaim=StandardResourceClaim[id=1484151577298-1971,
container=default, section=947], offset=566526,
length=64],offset=0,name=8551433629757608.tsv,size=64] is not the most
recent version of this FlowFile within this session
(StandardProcessSession[id=133767])
2017-01-11 10:53:39,563 WARN [Timer-Driven Process Thread-9]
o.a.n.c.t.ContinuallyRunProcessorTask
org.apache.nifi.processor.exception.FlowFileHandlingException:
StandardFlowFileRecord[uuid=07f3d75a-3347-45da-8dd4-fecf775d1dcf,claim=StandardContentClaim
[resourceClaim=StandardResourceClaim[id=1484151577298-1971,
container=default, section=947], offset=566526,
length=64],offset=0,name=8551433629757608.tsv,size=64] is not the most
recent version of this FlowFile within this session
(StandardProcessSession[id=133767])
        at
org.apache.nifi.controller.repository.StandardProcessSession.migrate(StandardProcessSession.java:1121)
~[nifi-framework-core-1.1.0.jar:1.1.0]
        at
org.apache.nifi.controller.repository.StandardProcessSession.migrate(StandardProcessSession.java:1102)
~[nifi-framework-core-1.1.0.jar:1.1.0]
        at org.apache.nifi.processor.util.bin.Bin.offer(Bin.java:142)
~[na:na]
        at
org.apache.nifi.processor.util.bin.BinManager.offer(BinManager.java:194)
~[na:na]
        at
org.apache.nifi.processor.util.bin.BinFiles.binFlowFiles(BinFiles.java:279)
~[na:na]
        at
org.apache.nifi.processor.util.bin.BinFiles.onTrigger(BinFiles.java:178)
~[na:na]
        at
org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1099)
~[nifi-framework-core-1.1.0.jar:1.1.0]
        at
org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:136)
[nifi-framework-core-1.1.0.jar:1.1.0]
        at
org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:47)
[nifi-framework-core-1.1.0.jar:1.1.0]
        at
org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:132)
[nifi-framework-core-1.1.0.jar:1.1.0]
        at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[na:1.8.0_65]
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
[na:1.8.0_65]
        at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
[na:1.8.0_65]
        at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
[na:1.8.0_65]
        at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
[na:1.8.0_65]
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
[na:1.8.0_65]
        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_65]




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