Re: PostgreSQL 14: pg_dump / pg_restore error: could not write to the communication channel: Broken pipe

Thank you for all the feedback and suggestions.

It seems that the "-h localhost" parameter is triggering the issue. If I 
leave it out, pg_restore works without problems with multiple jobs. I 
have also tried specifying the IP number instead of "localhost", but 
that results in the same error.

I see now that our original pg_restore script does not include the -h 
parameter. Somehow, it has snuck in my commands when testing Postgres 
14. That might mean that the same issue exists in previous versions as 
well. I will investigate further.

Nick


On 15 Oct 2021, at 19:08, Tom Lane wrote:

> Alvaro Herrera <alvherre@alvh.no-ip.org> writes:
>> Yeah, pg_dump in parallel mode uses a pipe to communicate between 
>> leader
>> and workers; the error you see is what happens when a write to the 
>> pipe
>> fails.  It sounds to me like something in the operating system is
>> preventing the pipes from working properly.
>
> BTW, I think a more likely explanation is "one of the pg_dump or
> pg_restore worker processes crashed".  Why that should be is still
> a mystery though.
>
>             regards, tom lane