Re: BUG #17828: postgres_fdw leaks file descriptors on error and aborts aborted transaction in lack of fds

Etsuro Fujita <etsuro(dot)fujita(at)gmail(dot)com> writes:
> IIUC I think the assertion failure was caused by an
> error-during-error-recovery loop caused by the "epoll_create1 failed:
> Too many open files" error raised in WaitLatchOrSocket called from
> pgfdw_get_cleanup_result, which is called during abort cleanup. I
> think a simple fix to avoid such a loop is to modify the PG_CATCH
> block in pgfdw_get_cleanup_result so that it just ignores the passed
> error, not re-throwing it, and restores InterruptHoldoffCount and the
> memory context, like the attached. In the patch I also modified
> callers of pgfdw_get_cleanup_result to issue a warning when ignoring
> the error. I might be missing something, though.

I do not think ignoring the passed error is *ever* acceptable.
You have no idea what the error condition is or whether your
hack is sufficient to recover from it.

regards, tom lane