[slurm-dev] AllowGroups not working with large LDAP database

[Michael Robbert]

I tried to setup AllowGroups for some partitions and found that some worked, but others didn't have any valid users in them. I turned on debugging and played with the code and eventually found that the code in slurmctld/groups.c is trying to scan the entire list of groups in order to enumerate its users. Our users and groups come from the campus LDAP servers which are very large and restrict query sizes. The getgrent_r function is the problem, it tries to pull the entire list of group names which then needs to be parsed. That seems pretty inefficient at best. In our case we end up with about 1/4 of the total entries so that when all is said and done some of our groups work, but others don't. All the information we need is in the results of the getgrnam_r function.

Can this be fixed somehow?

Thanks,
Mike

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