On 2020-May-26, Tom Lane wrote:
> Are you sure you correctly identified the source of the bogus error
> report?
This version's better. It doesn't touch the write side at all.
On the read side, only report a short read as such if errno's not set.
This error isn't frequently seen. This page
https://blog.csdn.net/pg_hgdb/article/details/106279303
(A Postgres fork; blames the error on the temp hash files being encrypted,
suggests to increase temp_buffers) is the only one I found.
There are more uses of BufFileRead that don't bother to distinguish
these two cases apart, though -- logtape.c, tuplestore.c,
gistbuildbuffers.c all do the same.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
