shuai.xu created FLINK-15964:
--------------------------------
Summary: 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
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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