Aklakan commented on issue #3535:
URL: https://github.com/apache/jena/issues/3535#issuecomment-3556711310

   @afs Regarding `DatasetGraphText`: In my PR i copied the 
TestQueryExecutionCancel tests to `jena-integration-tests` and made a setup 
with DatasetText + TDB2. This failed the tests with exceptions. They went away 
after synchronizing abort.
   What's happening is that abort first calls `rollback()` on the active lucene 
reader and then opens a new one. This was not synchronized so that concurrent 
aborts would each try to set a new lucene reader.


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