[slurm-users] Slurm version 20.02.0 is now available

[Dean Schulze]

There was a major refactoring between the 19.05 and 20.02 code.  Most of
the callbacks for select plugins were moved to cons_common.  I have a
plugin for 19.05 that depends on two of those callbacks:
select_p_job_begin() and select_p_job_fini().  My plugin is a copy of the
select/cons_res plugin, but when I implement those functions in my plugin I
get this error because those functions already exist in cons_common:

/home/dean/src/slurm.versions/slurm-20.02/slurm-20.02.0/src/plugins/select/cons_common/cons_common.c:1134:
multiple definition of `select_p_job_begin';
.libs/select_liqid_cons_res.o:/home/dean/src/slurm.versions/slurm-20.02/slurm-20.02.0/src/plugins/select/liqid_cons_res/select_liqid_cons_res.c:559:
first defined here
/usr/bin/ld: ../cons_common/.libs/libcons_common.a(cons_common.o): in
function `select_p_job_fini':
/home/dean/src/slurm.versions/slurm-20.02/slurm-20.02.0/src/plugins/select/cons_common/cons_common.c:1561:
multiple definition of `select_p_job_fini';
.libs/select_liqid_cons_res.o:/home/dean/src/slurm.versions/slurm-20.02/slurm-20.02.0/src/plugins/select/liqid_cons_res/select_liqid_cons_res.c:607:
first defined here
collect2: error: ld returned 1 exit status

Since only one select plugin can be used at a time (determined in
slurm.conf) I could put my code in the cons_common implementation of those
functions, but if I ever switch plugins then my plugin code will get
executed when it shouldn't be.

How can I "override" those callbacks in my own plugin?  This isn't Java
(but it sure looks like the slurm code tries to do Java in C).


On Tue, Feb 25, 2020 at 11:57 AM Tim Wickberg <tim at schedmd.com> wrote:

> After 9 months of development and testing we are pleased to announce the
> availability of Slurm version 20.02.0!
>
> Downloads are available from https://www.schedmd.com/downloads.php.
>
> Highlights of the 20.02 release include:
>
> - A "configless" method of deploying Slurm within the cluster, in which
> the slurmd and user commands can use DNS SRV records to locate the
> slurmctld host and automatically download the relevant configuration files.
>
> - A new "auth/jwt" authentication mechanism using JWT, which can help
> integrate untrusted external systems into the cluster.
>
> - A new "slurmrestd" command/daemon which translates a new Slurm REST
> API into the underlying libslurm calls.
>
> - Packaging fixes for RHEL8 distributions.
>
> - Significant performance improvements to the backfill scheduler, as
> well as to string construction and processing.
>
> Thank you to all customers, partners, and community members who
> contributed to this release.
>
> As with past releases, the documentation available at
> https://slurm.schedmd.com has been updated to the 20.02 release. Past
> versions are available in the archive. This release also marks the end
> of support for the 18.08 release. The 19.05 release will remain
> supported up until the 20.11 release in November, but will not see as
> frequent updates, and bug-fixes will be targeted for the 20.02
> maintenance releases going forward.
>
> --
> Tim Wickberg
> Chief Technology Officer, SchedMD
> Commercial Slurm Development and Support
>
>
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