Hi Eugen,

On Fri, Jun 19, 2026 at 2:27 PM Eugen Block via ceph-users
<[email protected]> wrote:
>
> Hi,
>
> I am currently looking into MDS warnings (behind on trimming) on a
> customer cluster. They recently upgraded to Squid 19.2.3 which seems
> to have fixed a bug with trimming, so the warning doesn't come that
> often anymore (if at all currently). But when digging a bit deeper, I
> noticed these messages in the event get list output:
>
> cephfs-journal-tool --rank=cephfs:0 event get list | head
> 2026-06-18T13:12:22.821+0000 7fec1b5ff280  0 uh oh, unknown log event
> type 100 length 14
> 2026-06-18T13:12:22.833+0000 7fec1b5ff280  0 uh oh, unknown log event
> type 100 length 14

What version is cephfs-journal-tool (--version) and is it the same
version as (or close to) the ceph cluster?

>
> That message is repeated 118 times or so before dumping the actual
> event list. I looked at the code for 19.2.0 [0] and 19.2.3 [1], in
> both cases event type 100 seems to be defined:
>
> #define EVENT_SEGMENT      100
>
> So why is it unknown? It doesn't appear to have any negative impact,
> at least noone has complained yet, but I still wanted to ask what this
> is about. Can I ignore this? Will that go away on its own at some point?
>
> Any pointers are appreciated!
>
> Thanks!
> Eugen
>
> [0] https://github.com/ceph/ceph/blob/v19.2.0/src/mds/LogEvent.h#L45
> [1] https://github.com/ceph/ceph/blob/v19.2.3/src/mds/LogEvent.h#L45
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