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1fe1f42e3e
This corrects an oversight by me in 20729324078, which made ProcArrayClearTransaction() increment xactCompletionCount. That requires an exclusive lock, obviously. There's other approaches that avoid the exclusive acquisition, but given that a 2PC commit is fairly heavyweight, it doesn't seem worth doing so. I've not been able to measure a performance difference, unsurprisingly. I did add a comment documenting that we could do so, should it ever become a bottleneck. Reported-By: Tom Lane <tgl@sss.pgh.pa.us> Author: Andres Freund <andres@anarazel.de> Discussion: https://postgr.es/m/1355915.1597794204@sss.pgh.pa.us