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https://issues.apache.org/jira/browse/FLINK-6533?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stefan Richter closed FLINK-6533.
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Resolution: Fixed
fixed in 4745d0c082
> Duplicated registration of new shared state when checkpoint confirmations are
> still pending
> -------------------------------------------------------------------------------------------
>
> Key: FLINK-6533
> URL: https://issues.apache.org/jira/browse/FLINK-6533
> Project: Flink
> Issue Type: Sub-task
> Components: State Backends, Checkpointing
> Affects Versions: 1.3.0
> Reporter: Stefan Richter
> Assignee: Stefan Richter
> Priority: Blocker
> Fix For: 1.3.0
>
>
> Each incremental RocksDB checkpoint n is registering new and existing shared
> state with the {{SharedStateRegistry}} when it completes. Only then, the
> backend is notified and all following checkpoints (n+x) can reference the new
> state in checkpoint n.
> However, when a checkpoint n+1 is already starting before n was confirmed to
> the backend, n+1 can assume some files as new, which were already contained
> in n. It will upload the file to DFS again, creating a new state handle.
> Then, once n+1 completes, it could to register some state as new, which was
> previously registered already by n, without n+1 knowing of this. Currently
> this violates a precondition check, that the reference count for state that
> is assumed as new is 1.
> While we cannot prevent duplicate uploads, we must resolve this situation in
> the {{SharedStateREgistry}}
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