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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4417) Checkpoints should be subsumed by CheckpointID not, by timestamp
Date Wed, 24 Aug 2016 12:08:20 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15434794#comment-15434794

ASF GitHub Bot commented on FLINK-4417:

Github user StephanEwen commented on the issue:

    Looks good to me, merging this.

> 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
>            Assignee: ramkrishna.s.vasudevan
>             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
> 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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