[LU-12098] changelog_deregister appears not to reliably clear all changelog entries

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.13.0, Lustre 2.12.3
• Affects Version/s: Lustre 2.10.6
• Labels: ORNL llnl
• Environment: Lustre 2.10.6_2.chaos ; zfs 0.7.11-5llnl ; distro toss-release-3.4-4 (RHEL 7.6 based) ; kernel 3.10.0-957.5.1.3chaos.ch6.x86_64 ; 2 MDTs, we use DNE1 ; See github.com/llnl/ for zfs and lustre code corresponding to these tags
• Severity: 3
• Assignee: Sebastien Buisson
• Reporter: Olaf Faaland

Description

After lctl changelog_deregister, changelogs were not fully cleared:

[root@porteri:~]# pdsh -g mds 'lctl get_param "*.*.changelog_users"' | dshbak -c
----------------
eporter81
----------------
mdd.lustre3-MDT0000.changelog_users=current index: 3856956771
ID    index
----------------
eporter82
----------------
mdd.lustre3-MDT0001.changelog_users=current index: 5663390742
ID    index
[root@porteri:~]# pdsh -g mds 'lctl get_param "*.*.changelog_size"' | dshbak -c
----------------
eporter81
----------------
mdd.lustre3-MDT0000.changelog_size=15384080
----------------
eporter82
----------------
mdd.lustre3-MDT0001.changelog_size=25036880872

Issue Links

• is related to: LU-11205 Failure to clear the changelog for user 1 on MDT