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https://issues.apache.org/jira/browse/OOZIE-3134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16354850#comment-16354850
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Andras Piros commented on OOZIE-3134:
-------------------------------------

Thanks [~rohini] for the feedback! 1) will then be addressed as part of 
OOZIE-1980, and only 2) here.

As for OOZIE-2854 and database retries, there is a short intro as part of 
[*AG_Install.twiki*|https://oozie.apache.org/docs/5.0.0-beta1/AG_Install.html#Database_Configuration]
 in {{5.0.0-beta1}}.

> Potential inconsistency between the in-memory SLA map and the Oozie database
> ----------------------------------------------------------------------------
>
>                 Key: OOZIE-3134
>                 URL: https://issues.apache.org/jira/browse/OOZIE-3134
>             Project: Oozie
>          Issue Type: Bug
>            Reporter: Attila Sasvari
>            Assignee: Julia Kinga Marton
>            Priority: Major
>             Fix For: 5.0.0
>
>         Attachments: OOZIE-3134-001.patch, OOZIE-3134-002.patch
>
>
> Upon {{SLACalculatorMemory.addRegistration}}, Oozie puts an entry into an 
> in-memory concurrent hashmap ("slaMap"), and later [persists 
> it|https://github.com/apache/oozie/blob/50f4b5984832941f1341586e43fd832c293b3275/core/src/main/java/org/apache/oozie/sla/SLACalculatorMemory.java#L380]
>  in the Oozie database. 
> However, if there is a failure during the database operation, a 
> {{JPAExecutorException}} is thrown, and the entry [is not removed from the 
> SLA map| 
> https://github.com/apache/oozie/blob/50f4b5984832941f1341586e43fd832c293b3275/core/src/main/java/org/apache/oozie/sla/SLACalculatorMemory.java#L393].
> It may introduce inconsistency between the Oozie database and the SLA map.
> To prevent this, a rollback mechanism (with proper logging) should be 
> implemented.  It would also make sense to do more sanity/consistency check in 
> the Oozie server.



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