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https://issues.apache.org/jira/browse/FLINK-37545?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Grzegorz Liter updated FLINK-37545:
-----------------------------------
Priority: Major (was: Critical)
> StackOverflowError when using MetricGroup in custom WatermarkStrategy
> ---------------------------------------------------------------------
>
> Key: FLINK-37545
> URL: https://issues.apache.org/jira/browse/FLINK-37545
> Project: Flink
> Issue Type: Bug
> Components: API / DataStream
> Affects Versions: 1.19.2, 1.20.1
> Reporter: Grzegorz Liter
> Priority: Major
>
> When using MetricGroup to expose custom metrics in Watermark Generator
> Example:
> {code:java}
> WatermarkStrategy
> .forGenerator(ctx ->
> new CustomWatermarkStrategy(ctx.getMetricGroup()))
> .withTimestampAssigner((event, timestamp) -> ...);
> {code}
> StackOverflowError will be thrown.
> This is due to changes done in
> https://issues.apache.org/jira/browse/FLINK-35886
> Previously code in
> `org.apache.flink.streaming.runtime.operators.TimestampsAndWatermarksOperator#open`
> look like this:
> {code:java}
> watermarkGenerator =
> emitProgressiveWatermarks
> ?
> watermarkStrategy.createWatermarkGenerator(this::getMetricGroup)
> : new NoWatermarksGenerator<>();
> {code}
> here in the `this::getMetricGroup` `this` refers to parent class instance
> now it looks like this
> {code:java}
> watermarkGenerator =
> emitProgressiveWatermarks
> ? watermarkStrategy.createWatermarkGenerator(
> new WatermarkGeneratorSupplier.Context() {
> @Override
> public MetricGroup getMetricGroup() {
> return this.getMetricGroup();
> }
> @Override
> public RelativeClock
> getInputActivityClock() {
> return inputActivityClock;
> }
> })
> : new NoWatermarksGenerator<>();
> {code}
> where `this` reference to anonymous class instance and causes infinite
> recursive loop
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