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https://issues.apache.org/jira/browse/FLINK-15964?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Flink Jira Bot updated FLINK-15964:
-----------------------------------
Labels: auto-deprioritized-major auto-unassigned pull-request-available
stale-minor (was: auto-deprioritized-major auto-unassigned
pull-request-available)
I am the [Flink Jira Bot|https://github.com/apache/flink-jira-bot/] and I help
the community manage its development. I see this issues has been marked as
Minor but is unassigned and neither itself nor its Sub-Tasks have been updated
for 180 days. I have gone ahead and marked it "stale-minor". If this ticket is
still Minor, please either assign yourself or give an update. Afterwards,
please remove the label or in 7 days the issue will be deprioritized.
> Getting previous stage in notFollowedBy may throw exception
> -----------------------------------------------------------
>
> Key: FLINK-15964
> URL: https://issues.apache.org/jira/browse/FLINK-15964
> Project: Flink
> Issue Type: Bug
> Components: Library / CEP
> Affects Versions: 1.9.0
> Reporter: shuai.xu
> Priority: Minor
> Labels: auto-deprioritized-major, auto-unassigned,
> pull-request-available, stale-minor
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In a notFollowedBy() condition, it may throw exception if trying to get value
> from previous stage for comparison.
> For example:
> Pattern<Event, ?> pattern = Pattern.<Event>begin("start",
> AfterMatchSkipStrategy.skipPastLastEvent())
> .notFollowedBy("not").where(new IterativeCondition<Event>() {
> private static final long serialVersionUID = -4702359359303151881L;
> @Override
> public boolean filter(Event value, Context<Event> ctx) throws Exception {
> return
> value.getName().equals(ctx.getEventsForPattern("start").iterator().next().getName());
> }
> })
> .followedBy("middle").where(new IterativeCondition<Event>() {
> @Override
> public boolean filter(Event value, Context<Event> ctx) throws Exception {
> return value.getName().equals("b");
> }
> });
> with inputs:
> Event a = new Event(40, "a", 1.0);
> Event b1 = new Event(41, "a", 2.0);
> Event b2 = new Event(43, "b", 3.0);
> It will throw
> org.apache.flink.util.FlinkRuntimeException: Failure happened in filter
> function.org.apache.flink.util.FlinkRuntimeException: Failure happened in
> filter function.
> at org.apache.flink.cep.nfa.NFA.findFinalStateAfterProceed(NFA.java:698) at
> org.apache.flink.cep.nfa.NFA.computeNextStates(NFA.java:628) at
> org.apache.flink.cep.nfa.NFA.doProcess(NFA.java:292) at
> org.apache.flink.cep.nfa.NFA.process(NFA.java:228) at
> org.apache.flink.cep.utils.NFATestHarness.consumeRecord(NFATestHarness.java:107)
> at
> org.apache.flink.cep.utils.NFATestHarness.feedRecord(NFATestHarness.java:84)
> at
> org.apache.flink.cep.utils.NFATestHarness.feedRecords(NFATestHarness.java:77)
> at
> org.apache.flink.cep.nfa.NFAITCase.testEndWithNotFollow(NFAITCase.java:2914)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498) at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
> at
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
> at
> org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
> at
> org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
> at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55) at
> org.junit.rules.RunRules.evaluate(RunRules.java:20) at
> org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at
> org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) at
> org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at
> org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) at
> org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at
> org.junit.runners.ParentRunner.run(ParentRunner.java:363) at
> org.junit.runner.JUnitCore.run(JUnitCore.java:137) at
> com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
> at
> com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
> at
> com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
> at
> com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)Caused
> by: java.util.NoSuchElementException at
> java.util.Collections$EmptyIterator.next(Collections.java:4189) at
> org.apache.flink.cep.nfa.NFAITCase$154.filter(NFAITCase.java:2884) at
> org.apache.flink.cep.nfa.NFAITCase$154.filter(NFAITCase.java:2879) at
> org.apache.flink.cep.nfa.NFA.checkFilterCondition(NFA.java:752) at
> org.apache.flink.cep.nfa.NFA.findFinalStateAfterProceed(NFA.java:688) ... 33
> more
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