URL: https://github.com/SSSD/sssd/pull/5552 Title: #5552: files: split update into batches
elkoniu commented: """ Two more issues exists so far: [ISSUE 1] 1) Add 5000 users without SSSD (raw NSS only, systemctl stop sssd, /etc/nsswitch.conf -> files only) 2) Enable sss in /etc/nsswitch.conf (passwd -> sss files, group -> sss files) 3) Start SSSD 4) Remove few users manually from /etc/passwd 5) Call `time for N in `seq 5000`; do userdel -r test-user-$N; done` Process will remove 1 user and will hang with `sssd_be` consuming `99%` of CPU, then switching to `sss_cahce` consuming `99%` of CPU. After about 1min it will continue to remove next user. At the end it takes around 1min to remove single user. [ISSUE 2] On top of steps from [ISSUE 1] 6) Stop SSSD: `systemctl stop sssd` 7) /etc/nsswitch.conf -> files only (sss removed from passwd and group to have only raw NSS provider) 8) Call `time for N in `seq 5000`; do userdel -r test-user-$N; done` userdel running on top of nss (SSSD stoped) still blocks and takes about 30s to remove single user. Also `sss_cache` is visible in `top` command consuming up to 60% of CPU (even with SSSD stopped) """ See the full comment at https://github.com/SSSD/sssd/pull/5552#issuecomment-872230342
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