[jboss-jira] [JBoss JIRA] (DROOLS-1221) Add fail-safe and scalability functionality to the Drools (CEP) rules engine

[Tom Pijl (JIRA)]

    [ https://issues.jboss.org/browse/DROOLS-1221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13285988#comment-13285988 ] 

Tom Pijl commented on DROOLS-1221:
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Thanks [~youcefhilem] for these pointers. 
The examples referenced in your first comment solves the high availability requirement at the cost of Rules flexibility (insert, update and delete facts are not allowed), but it didn't address the (horizontal) scalability requirement: distributing work over multiple engines. A solution is mentioned in the slide set: implementing Event partitioning, but the examples did notshow this.

I am still going through the project you referenced in your second comment....

> Add fail-safe and scalability functionality to the Drools (CEP) rules engine
> ----------------------------------------------------------------------------
>
>                 Key: DROOLS-1221
>                 URL: https://issues.jboss.org/browse/DROOLS-1221
>             Project: Drools
>          Issue Type: Feature Request
>          Components: core engine
>    Affects Versions: 6.4.0.Final
>         Environment: Drools (CEP) Rule engine 6.4.0.Final
>            Reporter: Tom Pijl
>            Assignee: Mario Fusco
>
> The Drools Rule engine is currently not fail-safe and scalable which is a requirement for Cloud deployment.
> Add a possibility to persist the state of the working memory after each state change (perhaps linked to the fireAllRules()?) and related to that the possibility to restore the state  in case of a crash (fail-safe requirement).
> This persistent state store can also be used to synchronize multiple engine instances (scalability requirement).
> Of course this has major impact on the performance of the engine, but it is the only way to make the engine useful in a multi-tenant Cloud environment



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