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https://issues.apache.org/jira/browse/FLINK-12044?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Flink Jira Bot updated FLINK-12044:
-----------------------------------
Labels: stale-minor (was: )
> Flink CEP discards events as late if they have timestamps <= 0
> --------------------------------------------------------------
>
> Key: FLINK-12044
> URL: https://issues.apache.org/jira/browse/FLINK-12044
> Project: Flink
> Issue Type: Bug
> Components: Library / CEP
> Affects Versions: 1.7.2
> Reporter: Arseniy Tashoyan
> Priority: Minor
> Labels: stale-minor
>
> Let's make an input stream like this:
> {code:scala}
> env.setStreamTimeCharacteristic(TimeCharacteristic.EventTime)
> val events = env.fromElements(
> Event(timestamp = 0L, siteId),
> Event(timestamp = 500L, siteId)
> )
> .assignTimestampsAndWatermarks(new
> BoundedOutOfOrdernessTimestampExtractor{...})
> {code}
> For this stream the event with timestamp = 0L will be treated as late. The
> reason is AbstractKeyedCEPPatternOperator that initializes lastWatermark with
> the default value provided by the compiler: zero. Would it be more correct to
> initialize lastWatermark with Long.MIN_VALUE?
> Of course, this is not a blocking defect, but I had really hard times to find
> why my unit test disregards the first event. Strictly speaking, this behavior
> seems incorrect.
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