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From "Ard Schrijvers (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-1214) DocId.UUIDDocId should not have a string attr uuid, but two long's lsb and msb
Date Tue, 13 Nov 2007 09:43:50 GMT

    [ https://issues.apache.org/jira/browse/JCR-1214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12542086
] 

Ard Schrijvers commented on JCR-1214:
-------------------------------------

One extra thing regarding JCR-1213: I also have to test that when merging like you describe
above happens, the cached docNumber for an index that did not change, might have a different
position in the MultiIndexReader after segment merging....ouchhhhh. Anyway, it makes it all
a little more complex, but will find these kind of things during implementing this issue and
1213. 



> DocId.UUIDDocId should not have a string attr uuid, but two long's lsb and msb 
> -------------------------------------------------------------------------------
>
>                 Key: JCR-1214
>                 URL: https://issues.apache.org/jira/browse/JCR-1214
>             Project: Jackrabbit
>          Issue Type: Improvement
>          Components: query
>    Affects Versions: 1.3.3
>            Reporter: Ard Schrijvers
>             Fix For: 1.4
>
>
> After JCR-1213 will be solved, lots of DocId.UUIDDocId can be cached, and not being cleaned
after every gc(). The number of cached UUIDDocId can grow very large, depending on the size
of the repository.  Therefor, instead of storing the private String uuid; we can make it more
memory efficient by storing 2 long's, the lsb and msb of the uuid.  Storing 1.000.000 of parent
UUIDDocId might differ about 100Mb of memory. 
> I even did test by removing the entire uuid string, and not use msb or lsb, because,
when everything works properly (with references to index reader segments (See JCR-1213)),
the uuid is never needed again: in 
> UUIDDocId getDocumentNumber(IndexReader reader) throws IOException {
> we could set uuid = null just before the return. It works perfectly well, because when
an index reader is recreated, the CachingIndexReader will be recreated, hence DocId[] parents
will be recreated. 
> So, IMO, I think we might be able to remove the uuid entirely when the docNumber is found
in DocId.UUIDDocId (obviously after JCR-1213)
> WDOT?

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