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https://issues.apache.org/jira/browse/FLINK-26726?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Flink Jira Bot updated FLINK-26726:
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Labels: pull-request-available stale-assigned (was: pull-request-available)
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> Remove the unregistered task from readersAwaitingSplit
> -------------------------------------------------------
>
> Key: FLINK-26726
> URL: https://issues.apache.org/jira/browse/FLINK-26726
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Ecosystem
> Reporter: zoucao
> Assignee: zoucao
> Priority: Major
> Labels: pull-request-available, stale-assigned
> Attachments: stack.txt
>
>
> Recently, we faced a problem caused by the unregistered task when using the
> hive table as a source to do streaming reading.
> I think the problem is that we do not remove the unregistered task from
> `readersAwaitingSplit` in `ContinuousHiveSplitEnumerator` and
> `ContinuousFileSplitEnumerator`.
> Assuming that we have two tasks 0 and 1, they all exist in
> `readersAwaitingSplit`, if there does not exist any new file in the path for
> a long time. Then, a new split is generated, and it is assigned to task-1.
> Unfortunately, task-1 can not consume the split successfully, and the
> exception will be thrown and cause all tasks to restart. The failover will
> not affect the `readersAwaitingSplit`, but it will clear the
> `SourceCoordinatorContext#registeredReaders`.
> After restarting, task-0 exists in `readersAwaitingSplit` but not in
> `registeredReaders`. if task-1 register first and send the request to get
> split, the SplitEnumerator will assign splits for both task-1 and task-0, but
> task-0 has not been registered.
> The stack exists in the attachment.
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