[lustre-discuss] Changelog users failing to clear records in 2.8, can anyone help?

Dilger, Andreas andreas.dilger at intel.com
Thu Jun 1 10:36:25 PDT 2017

On Jun 1, 2017, at 10:55, Faccini, Bruno <bruno.faccini at intel.com> wrote:
> Hello,
> According to the error msgs, looks like there is a corrupted plain-LLOG file for the ChangeLogs of MDT0. And unfortunately, neither e2fsck nor lfsck can help to recover in this case.

is this bug fixed in newer Lustre releases, or can something be done in the ChangeLog handling so that the ChangeLog can still be cleared in this case?  I don't think we care if the record is invalid when it is being deleted...  Could you please file a ticket in Jira about this, if it isn't already fixed.

Cheers, Andreas

> I think that to clear this situation you need to stop/umount this MDT and re-mount it as ldiskfs to move both changelog_users and changelog_catalog files to some alternate place/name (do not remove them!), umount ldiskfs, re-start/mount your MDT, re-run a RBH full-scan, re-register a ChangeLog user.
> Only side-effect doing so, can be the volume of orphan plain-LLOGs that will be kept consuming space on MDT. You should be able to identify them by running llog_reader tool over the saved/renamed old catalog file that will list you the references to all these remaining plain-LLOGs, allowing you to find+remove them during a new ldiskfs-mount session.
> Bruno.
>> On Jun 1, 2017, at 4:09 PM, Gibbins, Faye <Faye.Gibbins at cirrus.com> wrote:
>> Hi,
>> We have 4 file systems on our lustre cluster. All have changelog users registered for robinhood to use.
>> We have discovered that a changelog user for one of the file systems is not catching up to its index. Manual runs of Robinhood fail to read any more records even though according to mdd/tools-MDT0000/changelog_users there are record to read!
>> Over time the change log had filled and the file system had become sluggish. Wiping the robinhood mysql and reinitializing robin hood with a full scan didn’t fix the issue and like I said above three other change logs from different file systems (on the same MSG) are ok when used from the same robinhood instance.
>> What makes me think this is a lustre (and we are using 2.8 on ext4) problem is this (repeated) error we are getting in syslog:
>> [Wed May 31 14:06:59 2017] Lustre: 46400:0:(llog.c:530:llog_process_thread()) invalid length -420090294 in llog record for index 372672342/61708
>> [Wed May 31 14:06:59 2017] LustreError: 46400:0:(mdd_device.c:261:llog_changelog_cancel()) tools-MDD0000: cancel idx 645 of catalog 0x7:10 rc=-22
>> Deregistering the user from the change log and starting with a new one has not changed the behaviour and we still can’t use this new user to track changes to the file system.
>> Can anyone offer any advice on how to resolve this issue in the changelog?
>> If not can anyone confirm if taking the file system down for a e2fsck/lfsck will fix issues with the changelog? I’d settle for being able to clear the whole log and starting afresh if that’s possible?
>> Yours
>> Faye Gibbins
>> Snr SysAdmin, Unix Lead Architect
>> Software Systems and Cloud Services
>> Cirrus Logic | cirrus.com  | +44 (0) 131 272 7398
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Cheers, Andreas
Andreas Dilger
Lustre Principal Architect
Intel Corporation

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