[jira] [Reopened] (FLINK-8807) ZookeeperCompleted checkpoint store can get stuck in infinite loop

["Tzu-Li (Gordon) Tai (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-8807?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tzu-Li (Gordon) Tai reopened FLINK-8807:
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> ZookeeperCompleted checkpoint store can get stuck in infinite loop
> ------------------------------------------------------------------
>
>                 Key: FLINK-8807
>                 URL: https://issues.apache.org/jira/browse/FLINK-8807
>             Project: Flink
>          Issue Type: Bug
>          Components: State Backends, Checkpointing
>    Affects Versions: 1.5.0
>            Reporter: Aljoscha Krettek
>            Assignee: Aljoscha Krettek
>            Priority: Blocker
>             Fix For: 1.5.0, 1.4.3, 1.3.4
>
>
> This code: https://github.com/apache/flink/blob/9071e3befb8c279f73c3094c9f6bddc0e7cce9e5/flink-runtime/src/main/java/org/apache/flink/runtime/checkpoint/ZooKeeperCompletedCheckpointStore.java#L201 can be stuck forever if at least one checkpoint is not readable because {{CompletedCheckpoint}} does not have a proper {{equals()}}/{{hashCode()}} anymore.
> We have to fix this and also add a unit test that verifies the loop still works if we make one snapshot unreadable.



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