I noticed that processCancelRequest() emits a log message at DEBUG2 when
it receives a cancel request with a bad key or for a non-existent PID.
For example,
ereport(DEBUG2,
(errmsg_internal("bad key in cancel request for process %d",
backendPID)));
I think this ought to be logged at a higher level than DEBUG2: for one
thing, it is a potential security issue the DBA might want to be aware
of. It could also indicate a misconfigured or buggy client application.
Therefore, I think we should raise the level to WARNING, or perhaps
NOTICE. Any objections?
-Neil
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