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https://issues.apache.org/jira/browse/FLINK-19142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17322966#comment-17322966
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Flink Jira Bot commented on FLINK-19142:
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This issue is assigned but has not received an update in 7 days so it has been
labeled "stale-assigned". If you are still working on the issue, please give an
update and remove the label. If you are no longer working on the issue, please
unassign so someone else may work on it. In 7 days the issue will be
automatically unassigned.
> Investigate slot hijacking from preceding pipelined regions after failover
> --------------------------------------------------------------------------
>
> Key: FLINK-19142
> URL: https://issues.apache.org/jira/browse/FLINK-19142
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Coordination
> Affects Versions: 1.12.0
> Reporter: Andrey Zagrebin
> Assignee: Zhu Zhu
> Priority: Major
> Labels: pull-request-available, stale-assigned
> Fix For: 1.13.0
>
>
> The ticket originates from [this PR
> discussion|https://github.com/apache/flink/pull/13181#discussion_r481087221].
> The previous AllocationIDs are used by
> PreviousAllocationSlotSelectionStrategy to schedule subtasks into the slot
> where they were previously executed before a failover. If the previous slot
> (AllocationID) is not available, we do not want subtasks to take previous
> slots (AllocationIDs) of other subtasks.
> The MergingSharedSlotProfileRetriever gets all previous AllocationIDs of the
> bulk from SlotSharingExecutionSlotAllocator but only from the current bulk.
> The previous AllocationIDs of other bulks stay unknown. Therefore, the
> current bulk can potentially hijack the previous slots from the preceding
> bulks. On the other hand the previous AllocationIDs of other tasks should be
> taken if the other tasks are not going to run at the same time, e.g. not
> enough resources after failover or other bulks are done.
> One way to do it may be to give to MergingSharedSlotProfileRetriever all
> previous AllocationIDs of bulks which are going to run at the same time.
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