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From "Jukka Zitting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-954) Allow to disable referential integrity checking for workspace
Date Thu, 31 May 2007 09:53:15 GMT

    [ https://issues.apache.org/jira/browse/JCR-954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12500338
] 

Jukka Zitting commented on JCR-954:
-----------------------------------

Disabling the checks seems to be the only way for now to really achieve the use cases in question,
so I wouldn't just deny this change. However, could we end up with some real internal issues
for example if the NodeReferences structures inside a persistence store become incorrect?

I wouldn't worry too much about inconsistencies visible to the client application(s) if they
were knowingly injected by a client, but it is a problem if such inconsistencies would destabilize
the repository itself.


> Allow to disable referential integrity checking for workspace
> -------------------------------------------------------------
>
>                 Key: JCR-954
>                 URL: https://issues.apache.org/jira/browse/JCR-954
>             Project: Jackrabbit
>          Issue Type: New Feature
>          Components: core
>            Reporter: Przemo Pakulski
>             Fix For: 1.4
>
>         Attachments: JCR-954-patch.txt
>
>
> Some operations like clone, remove operating on huge subtree of nodes requires a lot
of memory. To copy, clone, remove subtree all nodes are loaded into transient spaces. It allows
such operations to be transactional, from other side it requires a lot of heap size and this
memory size is directly dependent on the size of subtree (number of nodes). In result of this
in some cases it is impossible to make such operations in one step. In our environment sometimes
1 GB of java heap is not enough to succesfully clone subtree  from one workspace to another.
> You can always clone (copy, remove) tree in chunks, but if you have references between
subtrees such approach fails. Possibilty of temporary disabling referential integrity checking
for experienced JCR user could be very usefull then.
> Another use case is to allow to clone selected subtrees of the whole structure between
worskpaces. In our application we need to clone only some selected subtrees from one workspace
to another. But we can not do that because of existing references. We need to clone the whol
estructure first, then remove all unwanted nodes, which is really time expensive and memory
consuming.

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