[NIFI-6153] [Wait/Notify] Wait processor doesn't release a file

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.8.0, 1.9.1
• Component/s: Core Framework
• Labels: flow notify processor synchronization wait
• Assignee: Unassigned
• Reporter: Artem Anokhin
• Created: 27/Mar/19 10:38
• Updated: 26/Apr/23 21:40

Description

TC:

1) Flow

2) Wait Processor Properties:

Release Signal Identifier: signal_${filename}

Target Signal Count: 0

Distributed Cache Service: RedisDistributedMapCacheClientService

Wait Mode: Keep in the upstream connection

3) Notify Processor Properties:

Release Signal Identifier: signal_${filename}

Distributed Cache Service: RedisDistributedMapCacheClientService

ER:
Flow file would be released if the expected count is 0.

AR:

• Without Notify processor a flowFile doesn't release.
• With Notify processor occurs the next exception:

o.a.n.controller.tasks.ConnectableTask Administratively Yielding Wait[id=bea7821d-0169-1000-5107-59ea62350cd2] due to uncaught Exception: java.lang.ArithmeticException: / by zero
java.lang.ArithmeticException: / by zero
at org.apache.nifi.processors.standard.WaitNotifyProtocol$Signal.releaseCandidates(WaitNotifyProtocol.java:145)
at org.apache.nifi.processors.standard.Wait.onTrigger(Wait.java:449)
at org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
at org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1162)
at org.apache.nifi.controller.tasks.ConnectableTask.invoke(ConnectableTask.java:205)
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)