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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ATLAS-535) Support delete cascade efficently
Date Fri, 26 Feb 2016 05:44:18 GMT

    [ https://issues.apache.org/jira/browse/ATLAS-535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15168482#comment-15168482
] 

Hemanth Yamijala commented on ATLAS-535:
----------------------------------------

[~suma.shivaprasad]

In all three options, there will be a need to delete a large number of entries. I think we
should look at solving the problem independent of the option we choose. For e.g. we could
implement a lazy delete in the background - a strategy used in many systems for handling a
similar problem. 

Option 3 looks good, generic and extensible. It could be a way to subsume the 'flags' that
we currently have in the type system with a mechanism that seems cleaner and more declarative.
The mechanics need to be thought through a little more - who can define new AssociationRules,
how, which rules are 'system' defined and can they be redefined, when would the system look
at AssociationRules - we would need to look at them every time and depending on the operation
see if there's one that needs to be picked up - would this add an overhead for all operations,
etc.

I am currently torn between 2 and 3. 2 is an easy extension and feels easy to implement, but
I am worried that with isComposite and isInverseComposite, would users be confused about which
to use when? The one consolation is that it is easy to migrate 2 to 3 in case we decide to
move to that once we understand it better.  

> Support delete cascade efficently
> ---------------------------------
>
>                 Key: ATLAS-535
>                 URL: https://issues.apache.org/jira/browse/ATLAS-535
>             Project: Atlas
>          Issue Type: Sub-task
>            Reporter: Suma Shivaprasad
>             Fix For: 0.7-incubating
>
>
> Currently there are some limitation in the typesystem and modelling to support delete
cascades at scale through the isComposite flag



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