afs commented on issue #1961:
URL: https://github.com/apache/jena/issues/1961#issuecomment-1645570295
The trouble with locks is deadlocks - both absolute ("deadly embrace") and
under load ("deadlock by congestion").
Don't mix "simple" and "lightweight" :-) Java locks are not lightweight.
Their contract on the memory model is expensive to the whole application. It's
the first generation memory model for Java. It's not a great fit to model
processor architectures.
`GraphTxn` - if the `Txn` troubles you ignore `Txn`.
It works without needing explicit application control - c.f. SQL has "auto
commit".
The datastructures behind GraphTxn are a Java port of the structures in
Scala.
I don't know ONT-API in detail - what is the contract for the application?
(OWL API doesn't mention it)
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