ebremer commented on issue #1646:
URL: https://github.com/apache/jena/issues/1646#issuecomment-1333776785
I was able to fix this last night. The "do the business" was sending a list
of resources and object values from the ResultSet to a ThreadPoolExecutor to
process over 64 cores. Whereas, the individual threads kept mostly to
themselves, each was adding the results back to the original Model as follows:
```
m.enterCriticalSection(Lock.WRITE);
m.add(z);
m.leaveCriticalSection();
```
The code work for thousands of large graphs, but for one, kept throwing the
same above error. I was able to fix the issue by buffering up all of the
threads and then calling engine.prestartAllCoreThreads() after the
```
rs.forEachRemaining(qs->{
do the business *
});
```
loop was done. ResultSet rs = qe.execSelect().materialise(); looks like it
would have solved the issue too so I will have to give it a try. Thanks!
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