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https://issues.apache.org/jira/browse/FLINK-6578?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kostas Kloudas updated FLINK-6578:
----------------------------------
Priority: Blocker (was: Major)
> SharedBuffer creates self-loops when having elements with same
> value/timestamp.
> -------------------------------------------------------------------------------
>
> Key: FLINK-6578
> URL: https://issues.apache.org/jira/browse/FLINK-6578
> Project: Flink
> Issue Type: Bug
> Components: CEP
> Affects Versions: 1.3.0
> Reporter: Kostas Kloudas
> Assignee: Kostas Kloudas
> Priority: Blocker
> Fix For: 1.3.0
>
>
> This is a test that fails with the current implementation due to the fact
> that the looping state accepts the two {{middleEvent1}} elements but the
> shared buffer cannot distinguish between them and gets trapped in an infinite
> loop leading to running out of memory.
> {code}
> @Test
> public void testEagerZeroOrMoreSameElement() {
> List<StreamRecord<Event>> inputEvents = new ArrayList<>();
> Event startEvent = new Event(40, "c", 1.0);
> Event middleEvent1 = new Event(41, "a", 2.0);
> Event middleEvent2 = new Event(42, "a", 3.0);
> Event middleEvent3 = new Event(43, "a", 4.0);
> Event end1 = new Event(44, "b", 5.0);
> inputEvents.add(new StreamRecord<>(startEvent, 1));
> inputEvents.add(new StreamRecord<>(middleEvent1, 3));
> inputEvents.add(new StreamRecord<>(middleEvent1, 3));
> inputEvents.add(new StreamRecord<>(middleEvent1, 3));
> inputEvents.add(new StreamRecord<>(middleEvent2, 4));
> inputEvents.add(new StreamRecord<>(new Event(50, "d", 6.0), 5));
> inputEvents.add(new StreamRecord<>(middleEvent3, 6));
> inputEvents.add(new StreamRecord<>(middleEvent3, 6));
> inputEvents.add(new StreamRecord<>(end1, 7));
> Pattern<Event, ?> pattern =
> Pattern.<Event>begin("start").where(new SimpleCondition<Event>() {
> private static final long serialVersionUID =
> 5726188262756267490L;
> @Override
> public boolean filter(Event value) throws Exception {
> return value.getName().equals("c");
> }
> }).followedBy("middle").where(new SimpleCondition<Event>() {
> private static final long serialVersionUID =
> 5726188262756267490L;
> @Override
> public boolean filter(Event value) throws Exception {
> return value.getName().equals("a");
> }
> }).oneOrMore().optional().followedBy("end1").where(new
> SimpleCondition<Event>() {
> private static final long serialVersionUID =
> 5726188262756267490L;
> @Override
> public boolean filter(Event value) throws Exception {
> return value.getName().equals("b");
> }
> });
> NFA<Event> nfa = NFACompiler.compile(pattern,
> Event.createTypeSerializer(), false);
> final List<List<Event>> resultingPatterns =
> feedNFA(inputEvents, nfa);
> compareMaps(resultingPatterns, Lists.<List<Event>>newArrayList(
> Lists.newArrayList(startEvent, middleEvent1,
> middleEvent1, middleEvent1, middleEvent2, middleEvent3, middleEvent3, end1),
> Lists.newArrayList(startEvent, middleEvent1,
> middleEvent1, middleEvent1, middleEvent2, middleEvent3, end1),
> Lists.newArrayList(startEvent, middleEvent1,
> middleEvent1, middleEvent1, middleEvent2, end1),
> Lists.newArrayList(startEvent, middleEvent1,
> middleEvent1, middleEvent1, end1),
> Lists.newArrayList(startEvent, middleEvent1,
> middleEvent1, end1),
> Lists.newArrayList(startEvent, middleEvent1,
> end1),
> Lists.newArrayList(startEvent, end1)
> ));
> }
> {code}
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