Ceph » rgw

calling RGWRados::set_attrs() will lead to different mtimes for the object and that stored in the bucket index, currently this is consumed by swift: setxattrs, s3: object tagging (probably acls as well).

Needs https://github.com/ceph/ceph/pull/17395 for verification (or a hand written application using librados::stat2 calls)

Initial state
$ ./bin/rados -p default.rgw.buckets.index getomapval .dir.7d1d633f-6404-489d-9653-648e393014f5.4133.1 obj obj_initial.omapval

$ ./bin/ceph-dencoder type rgw_bucket_dir_entry import obj_initial.omapval decode dump_json
{
    "name": "obj",
    "instance": "",
    "ver": {
        "pool": 6,
        "epoch": 1
    },
    "locator": "",
    "exists": "true",
    "meta": {
        "category": 1,
        "size": 333,
        "mtime": "2017-08-31 11:25:16.024856Z",
        "etag": "4c693106c9ae67cc4d857fb7c11a89bf",
        "owner": "test",
        "owner_display_name": "Tester-Subuser",
        "content_type": "",
        "accounted_size": 333,
        "user_data": "" 
    },
    "tag": "7d1d633f-6404-489d-9653-648e393014f5.4133.5",
    "flags": 0,
    "pending_map": [],
    "versioned_epoch": 0
}

$ ./bin/rados -p default.rgw.buckets.data stat2 7d1d633f-6404-489d-9653-648e393014f5.4133.1_obj
2017-08-31 13:28:37.235041 7f463313fe00 -1 WARNING: all dangerous and experimental features are enabled.
2017-08-31 13:28:37.235527 7f463313fe00 -1 WARNING: all dangerous and experimental features are enabled.
2017-08-31 13:28:37.237181 7f463313fe00 -1 WARNING: all dangerous and experimental features are enabled.
default.rgw.buckets.data/7d1d633f-6404-489d-9653-648e393014f5.4133.1_obj mtime 2017-08-31 13:25:16.024856, size 333

$ swift -A http://localhost:8000/auth -U "test:tester" -K testing post cont1 obj -m foo:bar

$ ./bin/rados -p default.rgw.buckets.index getomapval .dir.7d1d633f-6404-489d-9653-648e393014f5.4133.1 obj obj_final.omapval
Writing to obj_final.omapval
$./bin/ceph-dencoder type rgw_bucket_dir_entry import obj_final.omapval decode dump_json
{
    "name": "obj",
    "instance": "",
    "ver": {
        "pool": 6,
        "epoch": 2
    },
    "locator": "",
    "exists": "true",
    "meta": {
        "category": 1,
        "size": 333,
        "mtime": "2017-08-31 11:29:26.008730Z",
        "etag": "4c693106c9ae67cc4d857fb7c11a89bf\u0000",
        "owner": "test",
        "owner_display_name": "Tester-Subuser",
        "content_type": "\u0000",
        "accounted_size": 333,
        "user_data": "" 
    },
    "tag": "_R9cfI4zUfPFpZsEEaWv6arRljs4Zjs6",
    "flags": 0,
    "pending_map": [],
    "versioned_epoch": 0
}
$ ./bin/rados -p default.rgw.buckets.data stat2 7d1d633f-6404-489d-9653-648e393014f5.4133.1_obj
default.rgw.buckets.data/7d1d633f-6404-489d-9653-648e393014f5.4133.1_obj mtime 2017-08-31 13:29:25.994271, size 333

After a swift setxattrs call, bi reports the mtime at 2017-08-31 13:29:25.994271 compared to obj's mtime at 2017-08-31 11:29:26.008730Z (ignore the hour difference UTC vs local time)