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https://issues.apache.org/jira/browse/FLINK-19142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17298654#comment-17298654
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Till Rohrmann commented on FLINK-19142:
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You are right [~zhuzh], for batch jobs this is not required. Then I guess it is
ok to do it as you proposed. Let us guard the assumption that we are running a
streaming job when doing this, though. This helps to find the place if we
should change for which type of jobs local recovery is supported for whatever
reason in the future.
> 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
> 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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