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https://issues.apache.org/jira/browse/CONNECTORS-880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13897904#comment-13897904
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Karl Wright commented on CONNECTORS-880:
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It occurs to me that your issues may be due to MySQL transactional integrity.  
There were versions of MySQL that failed to properly serialize database 
activity; anything earlier than 5.5 for instance is definitely suspect.  What 
version of MySQL are you using?

> Under the right conditions, job aborts do not update "last checked" time
> ------------------------------------------------------------------------
>
>                 Key: CONNECTORS-880
>                 URL: https://issues.apache.org/jira/browse/CONNECTORS-880
>             Project: ManifoldCF
>          Issue Type: Bug
>          Components: Framework crawler agent
>    Affects Versions: ManifoldCF 1.4.1
>            Reporter: Karl Wright
>            Assignee: Karl Wright
>             Fix For: ManifoldCF 1.6
>
>
> When a scheduled job is being considered to be started, MCF updates the 
> last-check field ONLY if the job didn't start.  It relies on the job's 
> completion to set the last-check field in the case where the job does start.  
> But if the job aborts, in at least one case the last-check field is NOT 
> updated.  This leads to the job being run over and over again within the 
> schedule window.



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