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https://issues.apache.org/jira/browse/FLINK-32316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17731608#comment-17731608
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Cai Liuyang commented on FLINK-32316:
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[~pnowojski] please take a look? thks~
> Duplicated announceCombinedWatermark task maybe scheduled if jobmanager
> failover
> --------------------------------------------------------------------------------
>
> Key: FLINK-32316
> URL: https://issues.apache.org/jira/browse/FLINK-32316
> Project: Flink
> Issue Type: Bug
> Affects Versions: 1.16.0
> Reporter: Cai Liuyang
> Priority: Major
>
> When we try SourceAlignment feature, we found there will be a duplicated
> announceCombinedWatermark task will be scheduled after JobManager failover,
> and auto recover job from checkpoint.
> The reason i think is we should schedule announceCombinedWatermark task
> during SourceCoordinator::start function not in SourceCoordinator construct
> function (see
> [https://github.com/apache/flink/blob/master/flink-runtime/src/main/java/org/apache/flink/runtime/source/coordinator/SourceCoordinator.java#L149]
> ), because when jobManager encounter failover and auto recover job, it will
> create SourceCoordinator twice:
> * The first one is when JobMaster is create it will create the
> DefaultExecutionGraph.
> * The Second one is JobMaster call restoreLatestCheckpointedStateInternal
> method, which will be reset old sourceCoordinator and initialize a new one,
> but because the first sourceCoordinator is not started(SourceCoordinator will
> be started before SchedulerBase::startScheduling, so the first
> SourceCoordinator will not be fully closed).
>
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