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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (FLINK-4437) Lock evasion around lastTriggeredCheckpoint may lead to lost updates to related fields
Date Thu, 25 Aug 2016 15:51:21 GMT

     [ https://issues.apache.org/jira/browse/FLINK-4437?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ted Yu resolved FLINK-4437.
---------------------------
    Resolution: Fixed

> Lock evasion around lastTriggeredCheckpoint may lead to lost updates to related fields
> --------------------------------------------------------------------------------------
>
>                 Key: FLINK-4437
>                 URL: https://issues.apache.org/jira/browse/FLINK-4437
>             Project: Flink
>          Issue Type: Bug
>            Reporter: Ted Yu
>            Assignee: Ted Yu
>             Fix For: 1.2.0
>
>
> In CheckpointCoordinator#triggerCheckpoint():
> {code}
>         // make sure the minimum interval between checkpoints has passed
>         if (lastTriggeredCheckpoint + minPauseBetweenCheckpoints > timestamp) {
> {code}
> If two threads evaluate 'lastTriggeredCheckpoint + minPauseBetweenCheckpoints > timestamp'
in close proximity before lastTriggeredCheckpoint is updated, the two threads may have an
inconsistent view of "lastTriggeredCheckpoint" and updates to fields correlated with "lastTriggeredCheckpoint"
may be lost.



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