[hibernate-issues] [Hibernate-JIRA] Commented: (HSEARCH-5) Only index an entity when it's index properties have physically changed

[Stephane Epardaud (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-5?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=39896#action_39896 ] 

Stephane Epardaud commented on HSEARCH-5:
-----------------------------------------

@Emmanuel: not enough beer certainly ;)
@Sanne: Sorry about the late answer :(

1) It is unlikely I'll have time to update my patch to the current code base until there is a reason for my employer to pay me to do this.
2) If two different values hash to the same hash, then your hashing function is bad ;)
3) You make a good point, but I was entirely unable to retrieve enough info from Hibernate to construct the hash of the indexed entities prior to the current change, which is why it is stored at all. Otherwise I would construct both hashes (old/new) while reindexing.
4) Wasted space in the index is not a problem for me, especially compared with the order of magnitude we gained when our entities stopped propagating changes to all the other indexes where they were embedded even though nothing indexed changed.

> Only index an entity when it's index properties have physically changed
> -----------------------------------------------------------------------
>
>                 Key: HSEARCH-5
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-5
>             Project: Hibernate Search
>          Issue Type: New Feature
>          Components: engine
>            Reporter: Emmanuel Bernard
>            Priority: Minor
>         Attachments: hibernate-search-3.0.1.GA-hashing_patch.diff, hibernate-search-3.0.1.GA-id_field_patch.diff
>
>


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