[jewel][rgw]why the usage log record date is 16 hours later than the real operate time

[Leo Yu <wzyuliyang911@xxxxxxxxx>]

hi all, 

  i want get the usage of user,so i use the command radosgw-admin usage show ,but i can not get the usage when i use the --start-date unless  minus 16 hours

i have rgw both on ceph01 and ceph03,civeweb:7480 port ,and the ceph version is jewel 10.2.2

the time zone of ceph01 and ceph03

[root@ceph03 ~]# ls -l /etc/localtime 

lrwxrwxrwx 1 root root 35 Jul 25 07:40 /etc/localtime -> ../usr/share/zoneinfo/Asia/Shanghai

[root@ceph03 ~]# ssh ceph01 ls -l /etc/localtime 

lrwxrwxrwx 1 root root 35 Jul 25 14:14 /etc/localtime -> ../usr/share/zoneinfo/Asia/Shanghai

the timedateclt of ceph03

[root@ceph03 ~]# timedatectl 

Warning: Ignoring the TZ variable. Reading the system's time zone setting only.

      Local time: Fri 2016-07-29 08:28:44 CST

  Universal time: Fri 2016-07-29 00:28:44 UTC

        RTC time: Fri 2016-07-29 00:28:44

       Time zone: Asia/Shanghai (CST, +0800)

     NTP enabled: yes

NTP synchronized: yes

 RTC in local TZ: no

      DST active: n/a

the timedate of ceph01

[root@ceph03 ~]# ssh ceph01 timedatectl

      Local time: Fri 2016-07-29 08:32:43 CST

  Universal time: Fri 2016-07-29 00:32:43 UTC

        RTC time: Fri 2016-07-29 08:32:43

       Time zone: Asia/Shanghai (CST, +0800)

     NTP enabled: yes

NTP synchronized: yes

 RTC in local TZ: no

      DST active: n/a

i create bucket use the python script test2.py

[root@ceph01 ~]# cat  test2.py    

import requests

import logging

from datetime import *

from requests_toolbelt.utils import dump

from awsauth import S3Auth

# host = 'yuliyangdebugwebjewel.tunnel.qydev.com'

#host = 'yuliyangdebugweb68.tunnel.qydev.com'

#host = '10.254.9.20:7480'

host = '10.254.3.68:7480' #ceph03

#host = '127.0.0.1:7480'  #ceph01

logging.basicConfig(level=logging.DEBUG)

access_key = 'date2'

secret_key = 'date2'

cmd = '/%s' % '{:%m_%d.%H_%M_%S}'.format(datetime.now())

#cmd = '/%s' % '{:%m_%d.%H_%M_%S}'.format(datetime.now() - timedelta(hours=16))

url = "" % (host,cmd)

response = requests.put(url,auth=S3Auth(access_key, secret_key,service_url=host))

data = "">

print(data.decode('utf-8'))

and it's output

INFO:requests.packages.urllib3.connectionpool:Starting new HTTP connection (1): 10.254.3.68

DEBUG:requests.packages.urllib3.connectionpool:"PUT /07_29.08_34_42 HTTP/1.1" 200 0

< PUT /07_29.08_34_42 HTTP/1.1

< Host: 10.254.3.68:7480

< Content-Length: 0

< Accept-Encoding: gzip, deflate

< Accept: */*

< User-Agent: python-requests/2.6.0 CPython/2.7.5 Linux/3.10.0-327.el7.x86_64

< Connection: keep-alive

< date: Fri, 29 Jul 2016 00:34:42 GMT

< Authorization: AWS date2:F+KLuenLNP42e25P/My/VWoUkeA=

< 

> HTTP/1.1 200 OK

> date: Fri, 29 Jul 2016 00:34:42 GMT

> content-length: 0

> x-amz-request-id: tx000000000000000016112-00579aa4a2-c4c4f-default

> connection: Keep-Alive

> 

but the usage show the bucket create 16 hours before

[root@ceph01 ~]# radosgw-admin usage show --uid=date2 |grep 07_29.08_34_42  -A30                        

                    "bucket": "07_29.08_34_42",

                    "time": "2016-07-28 16:00:00.000000Z",

                    "epoch": 1469721600,

                    "owner": "date2",

                    "categories": [

                        {

                            "category": "create_bucket",

                            "bytes_sent": 19,

                            "bytes_received": 0,

                            "ops": 1,

                            "successful_ops": 1

                        }

                    ]

                },

the time("time": "2016-07-28 16:00:00.000000Z",) is 16 hours later than  Local time: Fri 2016-07-29 08:28:44 CST

i can get the usage show by radosgw-admin usage show --uid=date2 --start-date="2016-07-28 16:00:00"

[root@ceph03 ~]# radosgw-admin usage show --uid=date2 --start-date="2016-07-28 16:00:00"

{

    "entries": [

        {

            "user": "date2",

            "buckets": [

                {

                    "bucket": "07_29.08_34_42",

                    "time": "2016-07-28 16:00:00.000000Z",

                    "epoch": 1469721600,

                    "owner": "date2",

                    "categories": [

                        {

                            "category": "create_bucket",

                            "bytes_sent": 19,

                            "bytes_received": 0,

                            "ops": 1,

                            "successful_ops": 1

                        }

                    ]

                }

            ]

        }

    ],

    "summary": [

        {

            "user": "date2",

            "categories": [

                {

                    "category": "create_bucket",

                    "bytes_sent": 19,

                    "bytes_received": 0,

                    "ops": 1,

                    "successful_ops": 1

                }

            ],

            "total": {

                "bytes_sent": 19,

                "bytes_received": 0,

                "ops": 1,

                "successful_ops": 1

            }

        }

    ]

}

but this radosgw-admin usage show --uid=date2 --start-date="2016-07-28 16:00:01" can not get the usage 

[root@ceph03 ~]# radosgw-admin usage show --uid=date2 --start-date="2016-07-28 16:00:01"

{

    "entries": [],

    "summary": []

}

so how to get the correct usage?

i have try to modify the clock_offset in ceph.conf file

[client.rgw.ceph01]

host = ceph01

rgw thread pool size = 1000

clock_offset =57600   #16 hours

and it works.

but is it harmful  to  modify clock_offset and have some unknown problem?

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