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From "Stefan Guggisberg (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-2170) Remove PropDefId and NodeDefId
Date Wed, 24 Jun 2009 21:11:07 GMT

    [ https://issues.apache.org/jira/browse/JCR-2170?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12723740#action_12723740

Stefan Guggisberg commented on JCR-2170:

frankly i don't understand the problem to be solved. If it's just about the warnings in the
logs, i'd be against such a major change since the warnings are IMO correct (they indicate
a potential repository corruption.  

please provide a patch of the suggested change for review and further discussion and please
also provide representative profiling figures showing the neutral effect on performance. 

> Remove PropDefId and NodeDefId
> ------------------------------
>                 Key: JCR-2170
>                 URL: https://issues.apache.org/jira/browse/JCR-2170
>             Project: Jackrabbit Content Repository
>          Issue Type: Improvement
>          Components: jackrabbit-core
>    Affects Versions: 2.0.0
>            Reporter: Tobias Bocanegra
>             Fix For: 2.0.0
> the PropDefIds and NodeDefIds are used to quickly lookup a childnode- or property definition
in the nodetype registry (or effective nodetype).
> this is heavily used during reading, when calling Property.getDefinition() usually when
checking the isMultiple() flag. and of course while writing when getting the definition for
the property or childnode. 
> however, this poses problems when a nodetype is changed that is still used in the content.
if a property definition is changed due to an altered nodetype, subsequent accesses to that
property result in a "invalid propdefid" warning in the log - but the id is recomputed. this
is especially a problem when upgrade jackrabbit from 1.x to 2.0, where some of the builtin
nodetypes are defined differently.
> i think that it should be feasible to remove the propdefids and nodedefids and compute
the definition on demand. i think this can be implemented without performance loss, when some
sort of 'signatures' of the items are computed to quickly find the definitions in the effective
node type. furthermore, the most common usecase for using the property definition is probably
the isMultiple() check - which is now on the Property interface itself - which does not need
a definition lookup at all.
> and last but not least, it saves 8 bytes per item in the persistence layer.

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