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Posted to issues@flink.apache.org by "Roman Khachatryan (Jira)" <ji...@apache.org> on 2026/02/26 16:50:00 UTC

[jira] [Updated] (FLINK-39167) Initialize source output before emitting final watermark

     [ https://issues.apache.org/jira/browse/FLINK-39167?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Roman Khachatryan updated FLINK-39167:
--------------------------------------
    Description: 
After FLINK-38939, if the source operator was stopped while waiting for the first checkpoint then the output needs to be initialized so final watermark can be emitted; otherwise, final checkpoint will 

{code}
java.lang.IllegalStateException: null
	at org.apache.flink.util.Preconditions.checkState
	at org.apache.flink.streaming.api.operators.SourceOperator.emitLatestWatermark
	at org.apache.flink.streaming.api.operators.SourceOperator.emitNextNotReading
	at org.apache.flink.streaming.api.operators.SourceOperator.emitNext
	at org.apache.flink.streaming.runtime.io.StreamTaskSourceInput.emitNext
	at org.apache.flink.streaming.runtime.io.StreamOneInputProcessor.processInput
	at org.apache.flink.streaming.runtime.tasks.StreamTask.processInput
	at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop
	at org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop
	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke
	at org.apache.flink.runtime.taskmanager.Task.runWithSystemExitMonitoring
	at org.apache.flink.runtime.taskmanager.Task.restoreAndInvoke
	at org.apache.flink.runtime.taskmanager.Task.doRun
	at org.apache.flink.runtime.taskmanager.Task.run
{code}

> Initialize source output before emitting final watermark
> --------------------------------------------------------
>
>                 Key: FLINK-39167
>                 URL: https://issues.apache.org/jira/browse/FLINK-39167
>             Project: Flink
>          Issue Type: Bug
>          Components: Runtime / Task
>    Affects Versions: 2.3.0
>            Reporter: Roman Khachatryan
>            Assignee: Roman Khachatryan
>            Priority: Major
>             Fix For: 2.3.0
>
>
> After FLINK-38939, if the source operator was stopped while waiting for the first checkpoint then the output needs to be initialized so final watermark can be emitted; otherwise, final checkpoint will 
> {code}
> java.lang.IllegalStateException: null
> 	at org.apache.flink.util.Preconditions.checkState
> 	at org.apache.flink.streaming.api.operators.SourceOperator.emitLatestWatermark
> 	at org.apache.flink.streaming.api.operators.SourceOperator.emitNextNotReading
> 	at org.apache.flink.streaming.api.operators.SourceOperator.emitNext
> 	at org.apache.flink.streaming.runtime.io.StreamTaskSourceInput.emitNext
> 	at org.apache.flink.streaming.runtime.io.StreamOneInputProcessor.processInput
> 	at org.apache.flink.streaming.runtime.tasks.StreamTask.processInput
> 	at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop
> 	at org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop
> 	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke
> 	at org.apache.flink.runtime.taskmanager.Task.runWithSystemExitMonitoring
> 	at org.apache.flink.runtime.taskmanager.Task.restoreAndInvoke
> 	at org.apache.flink.runtime.taskmanager.Task.doRun
> 	at org.apache.flink.runtime.taskmanager.Task.run
> {code}



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