Re: Race conditions during parallel worker (unclean) exit

> > It seems cleaner to introduce a separate message for this case, maybe
> > "PqMsg_ParallelAborted", and keep the existing
> > "ERROR: lost connection to parallel worker" message.
>
> I'm not sure this is worth adjusting the FE/BE protocol. I'd prefer regular
> ERROR message (PqMsg_ErrorResponse), but only in some minimalistic form. The
> worker would only send the message, w/o doing any error handling itself.

Perhaps PqMsg_ErrorResponse could work, although I am not clear what a
minimalistic
form means here. I was thinking of PqMsg_ParallelAborted because we
have precedent
already with PqMsg_Progress which was introduced in f1889729dd3a as
the 'P' message
for parallel index progress reported, but later converted to a macro
in a99cc6c6b4b.

(I think it was wrong to name it PqMsg_Progress, but that's besides
the point here).

--
Sami Imseih
Amazon Web Service (AWS)