What are linger_ops in the output of objecter_requests ?

[Saverio Proto <zioproto@xxxxxxxxx>]

Hello,

debugging slow requests behaviour of our Rados Gateway, I run into
this linger_ops field and I cannot understand the meaning.

I would expect in the "ops" field to find slow requests stucked there.
Actually most of the time I have "ops": [], and looks like ops gets
empty very quickly.

However linger_ops is populated, and it is always the same requests,
looks like those are there forever.

Any explanation about what are linger_ops ?

thanks !

Saverio


root@xxxxxxx.cloud /home/proto ; ceph daemon
/var/run/ceph/ceph-radosgw.gateway.asok objecter_requests
{
    "ops": [],
    "linger_ops": [
        {
            "linger_id": 8,
            "pg": "10.84ada7c9",
            "osd": 9,
            "object_id": "notify.7",
            "object_locator": "@10",
            "target_object_id": "notify.7",
            "target_object_locator": "@10",
            "paused": 0,
            "used_replica": 0,
            "precalc_pgid": 0,
            "snapid": "head",
            "registered": "1"
        },
        {
            "linger_id": 2,
            "pg": "10.16dafda0",
            "osd": 27,
            "object_id": "notify.1",
            "object_locator": "@10",
            "target_object_id": "notify.1",
            "target_object_locator": "@10",
            "paused": 0,
            "used_replica": 0,
            "precalc_pgid": 0,
            "snapid": "head",
            "registered": "1"
        },
        {
            "linger_id": 6,
            "pg": "10.31099063",
            "osd": 52,
            "object_id": "notify.5",
            "object_locator": "@10",
            "target_object_id": "notify.5",
            "target_object_locator": "@10",
            "paused": 0,
            "used_replica": 0,
            "precalc_pgid": 0,
            "snapid": "head",
            "registered": "1"
        },
        {
            "linger_id": 3,
            "pg": "10.88aa5c95",
            "osd": 66,
            "object_id": "notify.2",
            "object_locator": "@10",
            "target_object_id": "notify.2",
            "target_object_locator": "@10",
            "paused": 0,
            "used_replica": 0,
            "precalc_pgid": 0,
            "snapid": "head",
            "registered": "1"
        },
        {
            "linger_id": 5,
            "pg": "10.a204812d",
            "osd": 66,
            "object_id": "notify.4",
            "object_locator": "@10",
            "target_object_id": "notify.4",
            "target_object_locator": "@10",
            "paused": 0,
            "used_replica": 0,
            "precalc_pgid": 0,
            "snapid": "head",
            "registered": "1"
        },
        {
            "linger_id": 4,
            "pg": "10.f8c99aee",
            "osd": 68,
            "object_id": "notify.3",
            "object_locator": "@10",
            "target_object_id": "notify.3",
            "target_object_locator": "@10",
            "paused": 0,
            "used_replica": 0,
            "precalc_pgid": 0,
            "snapid": "head",
            "registered": "1"
        },
        {
            "linger_id": 1,
            "pg": "10.4322fa9f",
            "osd": 82,
            "object_id": "notify.0",
            "object_locator": "@10",
            "target_object_id": "notify.0",
            "target_object_locator": "@10",
            "paused": 0,
            "used_replica": 0,
            "precalc_pgid": 0,
            "snapid": "head",
            "registered": "1"
        },
        {
            "linger_id": 7,
            "pg": "10.97c520d4",
            "osd": 103,
            "object_id": "notify.6",
            "object_locator": "@10",
            "target_object_id": "notify.6",
            "target_object_locator": "@10",
            "paused": 0,
            "used_replica": 0,
            "precalc_pgid": 0,
            "snapid": "head",
            "registered": "1"
        }
    ],
    "pool_ops": [],
    "pool_stat_ops": [],
    "statfs_ops": [],
    "command_ops": []
}
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