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https://issues.apache.org/jira/browse/FLINK-9635?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Till Rohrmann closed FLINK-9635.
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Resolution: Fixed
Release Note: With the improvements to Flink's scheduling, it can no longer
happen that recoveries require more slots than before if local recovery is
enabled. Consequently, we encourage our users to use the local recovery feature
which can be enabled by `state.backend.local-recovery: true`.
> Local recovery scheduling can cause spread out of tasks
> -------------------------------------------------------
>
> Key: FLINK-9635
> URL: https://issues.apache.org/jira/browse/FLINK-9635
> Project: Flink
> Issue Type: Bug
> Components: Distributed Coordination
> Affects Versions: 1.5.0, 1.6.2
> Reporter: Till Rohrmann
> Assignee: Stefan Richter
> Priority: Critical
> Labels: pull-request-available
> Fix For: 1.7.0
>
>
> In order to make local recovery work, Flink's scheduling was changed such
> that it tries to be rescheduled to its previous location. In order to not
> occupy slots which have state of other tasks cached, the strategy will
> request a new slot if the old slot identified by the previous allocation id
> is no longer present. This also applies to newly allocated slots because
> there is no distinction between new or already used. This behaviour can cause
> that every tasks gets deployed to its own slot if the {{SlotPool}} has
> released all slots in the meantime, for example. The consequence could be
> that a job can no longer be executed after a failure because it needs more
> slots than before.
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