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https://issues.apache.org/jira/browse/FLINK-10570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16662266#comment-16662266
]
ASF GitHub Bot commented on FLINK-10570:
----------------------------------------
dawidwys closed pull request #6896: [FLINK-10570] Fixed clearing shared buffer
nodes when using After match skip strategy
URL: https://github.com/apache/flink/pull/6896
This is a PR merged from a forked repository.
As GitHub hides the original diff on merge, it is displayed below for
the sake of provenance:
As this is a foreign pull request (from a fork), the diff is supplied
below (as it won't show otherwise due to GitHub magic):
diff --git
a/flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/nfa/NFA.java
b/flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/nfa/NFA.java
index f5e89d705b8..01dcfd97eb4 100644
--- a/flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/nfa/NFA.java
+++ b/flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/nfa/NFA.java
@@ -389,6 +389,7 @@ private void processMatchesAccordingToSkipStrategy(
sharedBufferAccessor);
result.add(sharedBufferAccessor.materializeMatch(matchedResult.get(0)));
+
sharedBufferAccessor.releaseNode(earliestMatch.getPreviousBufferEntry());
earliestMatch =
nfaState.getCompletedMatches().peek();
}
diff --git
a/flink-libraries/flink-cep/src/test/java/org/apache/flink/cep/nfa/AfterMatchSkipITCase.java
b/flink-libraries/flink-cep/src/test/java/org/apache/flink/cep/nfa/AfterMatchSkipITCase.java
index d42839e3071..239dd4f4857 100644
---
a/flink-libraries/flink-cep/src/test/java/org/apache/flink/cep/nfa/AfterMatchSkipITCase.java
+++
b/flink-libraries/flink-cep/src/test/java/org/apache/flink/cep/nfa/AfterMatchSkipITCase.java
@@ -20,15 +20,20 @@
import org.apache.flink.cep.Event;
import org.apache.flink.cep.nfa.aftermatch.AfterMatchSkipStrategy;
+import org.apache.flink.cep.nfa.aftermatch.SkipPastLastStrategy;
+import org.apache.flink.cep.nfa.sharedbuffer.SharedBuffer;
+import org.apache.flink.cep.nfa.sharedbuffer.SharedBufferAccessor;
import org.apache.flink.cep.pattern.Pattern;
import org.apache.flink.cep.pattern.conditions.IterativeCondition;
import org.apache.flink.cep.pattern.conditions.SimpleCondition;
+import org.apache.flink.cep.utils.TestSharedBuffer;
import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
import org.apache.flink.util.FlinkRuntimeException;
import org.apache.flink.util.TestLogger;
import org.apache.flink.shaded.guava18.com.google.common.collect.Lists;
+import org.hamcrest.Matchers;
import org.junit.Test;
import java.util.ArrayList;
@@ -38,6 +43,7 @@
import static org.apache.flink.cep.nfa.NFATestUtilities.compareMaps;
import static org.apache.flink.cep.nfa.NFATestUtilities.feedNFA;
import static org.apache.flink.cep.utils.NFAUtils.compile;
+import static org.junit.Assert.assertThat;
/**
* IT tests covering {@link AfterMatchSkipStrategy}.
@@ -936,4 +942,43 @@ public boolean filter(Event value, Context<Event> ctx)
throws Exception {
Lists.newArrayList(a2, c2, b1)
));
}
+
+ @Test
+ public void testSharedBufferIsProperlyCleared() throws Exception {
+ List<StreamRecord<Event>> inputEvents = new ArrayList<>();
+
+ for (int i = 0; i < 4; i++) {
+ inputEvents.add(new StreamRecord<>(new Event(1, "a",
1.0), i));
+ }
+
+ SkipPastLastStrategy matchSkipStrategy =
AfterMatchSkipStrategy.skipPastLastEvent();
+ Pattern<Event, ?> pattern = Pattern.<Event>begin("start",
matchSkipStrategy)
+ .where(new SimpleCondition<Event>() {
+ private static final long serialVersionUID =
5726188262756267490L;
+
+ @Override
+ public boolean filter(Event value) throws
Exception {
+ return true;
+ }
+ }).times(2);
+
+ NFA<Event> nfa = compile(pattern, false);
+
+ SharedBuffer<Event> sharedBuffer =
TestSharedBuffer.createTestBuffer(Event.createTypeSerializer());
+ NFAState nfaState = nfa.createInitialNFAState();
+
+ for (StreamRecord<Event> inputEvent : inputEvents) {
+ try (SharedBufferAccessor<Event> sharedBufferAccessor =
sharedBuffer.getAccessor()) {
+ nfa.advanceTime(sharedBufferAccessor, nfaState,
inputEvent.getTimestamp());
+ nfa.process(
+ sharedBufferAccessor,
+ nfaState,
+ inputEvent.getValue(),
+ inputEvent.getTimestamp(),
+ matchSkipStrategy);
+ }
+ }
+
+ assertThat(sharedBuffer.isEmpty(), Matchers.is(true));
+ }
}
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> State grows unbounded when "within" constraint not applied
> ----------------------------------------------------------
>
> Key: FLINK-10570
> URL: https://issues.apache.org/jira/browse/FLINK-10570
> Project: Flink
> Issue Type: Bug
> Components: CEP
> Affects Versions: 1.6.1
> Reporter: Thomas Wozniakowski
> Assignee: Dawid Wysakowicz
> Priority: Major
> Labels: pull-request-available
>
> We have been running some failure monitoring using the CEP library. Simple
> stuff that should probably have been implemented with a window, rather than
> CEP, but we had already set the project up to use CEP elsewhere and it was
> trivial to add this.
> We ran the following pattern (on 1.4.2):
> {code:java}
> begin(PURCHASE_SEQUENCE, AfterMatchSkipStrategy.skipPastLastEvent())
> .subtype(PurchaseEvent.class)
> .times(100)
> {code}
> and then flat selected the responses if the failure ratio was over a certain
> threshold.
> With 1.6.1, the state size of the CEP operator for this pattern grows
> unbounded, and eventually destroys the job with an OOM exception. We have
> many CEP operators in this job but all the rest use a "within" call.
> In 1.4.2, it seems events would be discarded once they were no longer in the
> 100 most recent, now it seems they are held onto indefinitely.
> We have a workaround (we're just going to add a "within" call to force the
> CEP operator to discard old events), but it would be useful if we could have
> the old behaviour back.
> Please let me know if I can provide any more information.
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