Pavel Mikhailovskii created JENA-1785:
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Summary: A newly created node can remain invisible after commit
Key: JENA-1785
URL: https://issues.apache.org/jira/browse/JENA-1785
Project: Apache Jena
Issue Type: Bug
Components: TDB2
Affects Versions: Jena 3.13.1, Jena 3.13.0
Reporter: Pavel Mikhailovskii
Attachments: TestVisibilityOfChanges.java
A node once marked as non-present (_NodeTableCache.nonPresent_) can remain
invisible even after it's created and the transaction is committed. That might
happen because there's no guarantee that *all* newly created nodes will be
eventually added to the "base" version _ThreadBufferingCache.baseCache_ of the
_node2id_Cache_ (as the _localCache_ has limited capacity) or removed from the
"base" version of the _nonPresent_ cache (even if they were, there would still
be a chance of re-adding them by some read transaction).
The simplest fix is to get rid of the _nonPresent_ cache which seems to be of
limited use anyway. A more sophisticated fix would involve keeping track of all
newly allocated nodes and their removal from the base version of _nonPresent_
cache on transaction commit.
To reproduce: see the attached test.
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