[GitHub] [jena] der opened a new pull request #580: JENA-1719: Work around for iterators being held across transactions

[GitBox <gi...@apache.org>]

der opened a new pull request #580: JENA-1719: Work around for iterators being held across transactions
URL: https://github.com/apache/jena/pull/580
 
 
   Provides a workaround to #JENA-1719.
   
   Underlying problem is that when inferences are not run to completion
   then tabled goals and associated interpreters and agenda entries can
   get retained and in some cases can hold on to uncompleted iterators.
   Correct fix would be to clean these up but doing this safely, especially 
   in the presence of concurrent queries is tricky.
   
   Long term solution might need serious redesign of the backward engine with 
   concurrency and transactions in mind. 
   
   This workaround wraps the iterators so that if one is retained and 
   and reused across a transaction boundary then it will attempt to restart
   it. So doesn't fix the underlying problem but does workaround it for this test case.
   

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