Re: libpq compression

Robert Haas <robertmhaas@gmail.com> writes:
> On Tue, Dec 22, 2020 at 2:33 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> I'd assume that there's a direct correlation between the compression level
>> setting and the window size; but I've not studied the libzstd docs in
>> enough detail to know what it is.

> But there is a privilege boundary between the sender and the receiver.
> What's alleged here is that the sender can do a thing which causes the
> receiver to burn through tons of memory. It doesn't help anything to
> say, well, the sender ought to use a window size of N or less. What if
> they don't?

The receiver rejects the data as though it were corrupt.

            regards, tom lane