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From "Stefan Richter (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-6633) Register with shared state registry before adding to CompletedCheckpointStore
Date Wed, 21 Jun 2017 08:34:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-6633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16057176#comment-16057176
] 

Stefan Richter commented on FLINK-6633:
---------------------------------------

[~cresny@gmail.com], I think this log was already enough to figure out the problem. Good news
is, the basic incremental checkpointing works as expected. Bad news is the combination of
{{StandaloneCompletedCheckpointStore}} and externalized checkpoints is broken. {{StandaloneCompletedCheckpointStore}}
does not recover completed checkpoints on restore and therefore does not re-register them.
The fix will first add the checkpoint from which we restored to the {{StandaloneCompletedCheckpointStore}},
so that it can be registered as shared state again, and references from future checkpoints
work.

> Register with shared state registry before adding to CompletedCheckpointStore
> -----------------------------------------------------------------------------
>
>                 Key: FLINK-6633
>                 URL: https://issues.apache.org/jira/browse/FLINK-6633
>             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
>
>
> Introducing placeholders for previously existing shared state requires a change that
shared state is first registering with {{SharedStateregistry}} (thereby being consolidated)
and only after that added to a {{CompletedCheckpointStore}}, so that the consolidated checkpoint
is written to stable storage. 



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