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https://issues.apache.org/jira/browse/JENA-352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13618126#comment-13618126
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Andy Seaborne commented on JENA-352:
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A new blank node allocator for RIOT has been added.
It uses a large seed (a random UUID - 122 bits of random information) and the
label given. These are combined into an MD5 value (128 bits) which then forms
the bNode id, currently as a hex string, in lower case.
> Vast numbers of bNodes can overwhelm the parser
> -----------------------------------------------
>
> Key: JENA-352
> URL: https://issues.apache.org/jira/browse/JENA-352
> Project: Apache Jena
> Issue Type: Bug
> Components: RIOT, TDB
> Reporter: Andy Seaborne
> Priority: Minor
>
> The parsers need to keep a bNode label to bNode map which (unusual data) can
> grow too large. As it takes unusual data, rated as "minor".
> outline of solution:
> 1/ switch to a bNode allocation scheme which has a seed (a large random
> number per parser run), and concat or XOR with the claimed bNode label to
> generate a unique label without state build up.
> 2/ (Turtle) don't remember [] bnodes past their usage scope.
> 3/ Partial - keep a sliding window of bNodes label mappings
> 4/ Direct allocation for _:label and tracked allocation for []
> e.g.
> http://mail-archives.apache.org/mod_mbox/jena-users/201112.mbox/%[email protected]%3E
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