[jira] [Commented] (FLINK-4417) Checkpoints should be subsumed by CheckpointID not, by timestamp

["ramkrishna.s.vasudevan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-4417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15427688#comment-15427688 ] 

ramkrishna.s.vasudevan commented on FLINK-4417:
-----------------------------------------------

[~StephanEwen]
Is it ok if I can take this up? If you have already started working on this - then no problem. 


> Checkpoints should be subsumed by CheckpointID not, by timestamp
> ----------------------------------------------------------------
>
>                 Key: FLINK-4417
>                 URL: https://issues.apache.org/jira/browse/FLINK-4417
>             Project: Flink
>          Issue Type: Bug
>          Components: State Backends, Checkpointing
>    Affects Versions: 1.1.2
>            Reporter: Stephan Ewen
>             Fix For: 1.2.0
>
>
> Since the system clocks cannot be expected to be stable/monotonous, the subsumption logic in the checkpoint coordinator should not decide which checkpoint is "newer" based on the system time.
> The checkpoint ID is guaranteed to be strictly monotonously increasing. It is a better measure to decide which checkpoint is newer.



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