Hi Istvan,
the issue you're referring to has nothing about real high latency ops.
It's just a cosmetic issue caused by improper ordering of the events
which resulted in negative delta between them and hence showing that
delta as a huge positive value.
But this impacts operations dump only. Fixed in 17.2.8 and upcoming
18.2.5, see https://tracker.ceph.com/issues/61388
Moreover please see the duration of the shared operation:
"duration": 0.035560873999999999,
It's 35ms which might be not super low for NVMe/SSD-based OSD but that's definitely not a HUGE latency anyway.
So that's not a really bad slow operation...
And once again - huge value in the event timestamp is just a cosmetic issue isn't worth much attention.
Thanks,
Igor
On 18/02/2025 10:28, Szabo, Istvan (Agoda) wrote:
Hi,
I haven't really see much about this kind of event in ceph KB:
"event": "header_read",
"time": "2025-02-18T14:20:00.610389+0700",
"duration": 4294967295.999999
However we have huge latencies caused by this operation:
"description": "osd_repop(client.3694832962.0:140533664 26.561 e748587/706771 26:86be7203:::.dir.9213182a-14ba-48ad-bde9-289a1c0c0de8.3654639937.1.43:head v 748587'789007122, mlcod=748587'789007120)",
"initiated_at": "2025-02-18T14:20:00.610390+0700",
"age": 87.067761466999997,
"duration": 0.035560873999999999,
"type_data": {
"flag_point": "commit sent; apply or cleanup",
"events": [
{
"event": "initiated",
"time": "2025-02-18T14:20:00.610390+0700",
"duration": 0
},
{
"event": "throttled",
"time": "2025-02-18T14:20:00.610390+0700",
"duration": 0
},
{
"event": "header_read",
"time": "2025-02-18T14:20:00.610389+0700",
"duration": 4294967295.999999
},
{
"event": "all_read",
"time": "2025-02-18T14:20:00.610402+0700",
"duration": 1.3264e-05
},
{
"event": "dispatched",
"time": "2025-02-18T14:20:00.610405+0700",
"duration": 2.3549999999999999e-06
},
{
"event": "queued_for_pg",
"time": "2025-02-18T14:20:00.610409+0700",
"duration": 3.8770000000000003e-06
},
{
"event": "reached_pg",
"time": "2025-02-18T14:20:00.610429+0700",
"duration": 2.0027e-05
},
{
"event": "started",
"time": "2025-02-18T14:20:00.610438+0700",
"duration": 9.8290000000000003e-06
},
{
"event": "commit_sent",
"time": "2025-02-18T14:20:00.645931+0700",
"duration": 0.035492616999999997
},
{
"event": "done",
"time": "2025-02-18T14:20:00.645951+0700",
"duration": 2.0007e-05
}
Is there a way to track it down what does this mean?
Thanks
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