"event": "header_read"

["Szabo, Istvan (Agoda)" <Istvan.Szabo@xxxxxxxxx>]

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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