Re: logical decoding : exceeded maxAllocatedDescs for .spill files

On Thu, 12 Dec 2019 at 11:34, Amit Khandekar <amitdkhan(dot)pg(at)gmail(dot)com> wrote:

> So max_changes_in_memory is the one
> that allows us to reduce the number of transactions required, so we
> can cut down on the outer loop iterations and make the test finish
> much earlier.

>
> But also note that, we can't use the test suite in
> contrib/test_decoding, because max_changes_in_memory needs server
> restart. So we need to shift this test to src/test/recovery. And
> there, I guess it is not that critical for the testcase to be very
> quick because the tests in general are much slower than the ones in
> contrib/test_decoding, although it would be nice to make it fast. What
> I propose is to modify max_changes_in_memory, do a server restart
> (which takes hardly a sec), run the testcase (3.5 sec) and then
> restart after resetting the guc. So totally it will be around 4-5
> seconds.

Sorry I meant max_files_per_process. We need to reduce
max_files_per_process, so that it causes max_safe_fds to be reduced,
and so only a few transactions are sufficient to reproduce the
problem, because the reserveAllocatedDesc() will return false much
sooner due to low max_safe_fds.

--
Thanks,
-Amit Khandekar
EnterpriseDB Corporation
The Postgres Database Company