[devstack][infra] POST_FAILURE on export-devstack-journal : Export journal

[Radosław Piliszek]

On Tue, Apr 6, 2021 at 6:02 PM Jeremy Stanley <fungi at yuggoth.org> wrote:
> Looking at the error, I strongly suspect memory exhaustion. We could
> try tuning xz to use less memory when compressing.

That was my hunch as well, hence why I test using gzip.

On Tue, Apr 6, 2021 at 5:51 PM Clark Boylan <cboylan at sapwetik.org> wrote:
>
> On Tue, Apr 6, 2021, at 8:14 AM, Radosław Piliszek wrote:
> > I am testing whether replacing xz with gzip would solve the problem [1] [2].
>
> The reason we used xz is that the files are very large and gz compression is very poor compared to xz for these files and these files are not really human readable as is (you need to load them into journald first). Let's test it and see what the gz file sizes look like but if they are still quite large then this is unlikely to be an appropriate fix.

Let's see how bad the file sizes are.
If they are acceptable, we can keep gzip and be happy.
Otherwise we try to tune the params to make xz a better citizen as
fungi suggested.

-yoctozepto