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https://issues.apache.org/jira/browse/FLINK-10570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16674424#comment-16674424
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Thomas Wozniakowski commented on FLINK-10570:
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Hi [~dawidwys], I notice this is scheduled for inclusion in 1.6.3, but it looks
like the PR was merged several days before 1.6.2 was released. Just wanted to
check if this fix might have snuck into 1.6.2 before it went out?
Otherwise we're good to wait on 1.6.3, but it would be super handy if the fix
was available now :)
> 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
> Fix For: 1.6.3, 1.7.0
>
>
> 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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