[jira] [Assigned] (FLINK-6984) Do not recover CompletedCheckpointStore on every restore

["Yun Tang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yun Tang reassigned FLINK-6984:
-------------------------------

    Assignee: Jiayi Liao  (was: Yun Tang)

> Do not recover CompletedCheckpointStore on every restore
> --------------------------------------------------------
>
>                 Key: FLINK-6984
>                 URL: https://issues.apache.org/jira/browse/FLINK-6984
>             Project: Flink
>          Issue Type: Improvement
>          Components: Runtime / State Backends
>    Affects Versions: 1.2.1, 1.3.0, 1.4.0
>            Reporter: Stefan Richter
>            Assignee: Jiayi Liao
>            Priority: Major
>
> Currently, restoring the latest checkpoint always recovers the {{CompletedCheckpointStore}} in {{CheckpointCoordinator::restoreLatestCheckpointedState(...)}} by calling {{completedCheckpointStore.recover(sharedStateRegistry)}}. I think this is not required on every restore, but can happen only once when the JM becomes leader, e.g. when the {{CheckpointCoordinator}} is created. This can avoid unnecessary work and simplify the logic, e.g. for populating the {{SharedStateRegistry}}, and we could probably also move the ownership for {{SharedStateRegistry}} into some {{AbstractCompletedCheckpontStore}}.



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