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https://issues.apache.org/jira/browse/FLINK-14859?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gary Yao closed FLINK-14859.
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Resolution: Fixed
master: beba9dc0a48ca2256d5b871ef96885811273bf0e
> Avoid leaking unassigned Slot in DefaultScheduler when Deployment is outdated
> -----------------------------------------------------------------------------
>
> Key: FLINK-14859
> URL: https://issues.apache.org/jira/browse/FLINK-14859
> Project: Flink
> Issue Type: Sub-task
> Components: Runtime / Coordination
> Affects Versions: 1.10.0
> Reporter: Gary Yao
> Assignee: Gary Yao
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.10.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> In {{DefaultScheduler#assignResourceOrHandleError()}}, if the deployment is
> outdated, we should release the possibly acquired {{LogicalSlot}} so that we
> do not leak resources.
> Below is an example to illustrate how slot leak is currently possible:
> # Vertices A1, A2, A3 are scheduled in a batch.
> # A2 acquires a slot. A1, A3 do not.
> # A1 fails due to slot allocation timeout and triggers failover
> ({{DefaultScheduler#cancelTasksAsync}})
> # A2 is canceled first and its returned slot is assigned to A3, which
> triggers {{DefaultScheduler#assignResourceOrHandleError}} of A3.
> However, A3 is not canceled yet but it is outdated because
> {{executionVertexVersioner#recordVertexModifications}} was already invoked
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