Yeah I checked the dump , it it truely the known issue.
Thanks
2017-03-08 17:58 GMT+08:00 John Spray <jspray@xxxxxxxxxx>:
> On Tue, Mar 7, 2017 at 3:05 PM, Xiaoxi Chen <superdebuger@xxxxxxxxx> wrote:
>> Thanks John.
>>
>> Very likely, note that mds_mem::ino + mds_cache::strays_created ~=
>> mds::inodes, plus the MDS was the active-standby one, and become
>> active days ago due to failover.
>>
>> mds": {
>> "inodes": 1291393,
>> }
>> "mds_cache": {
>> "num_strays": 3559,
>> "strays_created": 706120,
>> "strays_purged": 702561
>> }
>> "mds_mem": {
>> "ino": 584974,
>> }
>>
>> I do have a cache dump from the mds via admin socket, is there
>> anything I can get from it to make 100% percent sure?
>
> You could go through that dump and look for the dentries with no inode
> number set, but honestly if this is a previously-standby-replay daemon
> and you're running pre-Kraken code I'd be pretty sure it's the known
> issue.
>
> John
>
>>
>> Xiaoxi
>>
>> 2017-03-07 22:20 GMT+08:00 John Spray <jspray@xxxxxxxxxx>:
>>> On Tue, Mar 7, 2017 at 9:17 AM, Xiaoxi Chen <superdebuger@xxxxxxxxx> wrote:
>>>> Hi,
>>>>
>>>> From the admin socket of mds, I got following data on our
>>>> production cephfs env, roughly we have 585K inodes and almost same
>>>> amount of caps, but we have>2x dentries than inodes.
>>>>
>>>> I am pretty sure we dont use hard link intensively (if any).
>>>> And the #ino match with "rados ls --pool $my_data_pool}.
>>>>
>>>> Thanks for any explanations, appreciate it.
>>>>
>>>>
>>>> "mds_mem": {
>>>> "ino": 584974,
>>>> "ino+": 1290944,
>>>> "ino-": 705970,
>>>> "dir": 25750,
>>>> "dir+": 25750,
>>>> "dir-": 0,
>>>> "dn": 1291393,
>>>> "dn+": 1997517,
>>>> "dn-": 706124,
>>>> "cap": 584560,
>>>> "cap+": 2657008,
>>>> "cap-": 2072448,
>>>> "rss": 24599976,
>>>> "heap": 166284,
>>>> "malloc": 18446744073708721289,
>>>> "buf": 0
>>>> },
>>>>
>>>
>>> One possibility is that you have many "null" dentries, which are
>>> created when we do a lookup and a file is not found -- we create a
>>> special dentry to remember that that filename does not exist, so that
>>> we can return ENOENT quickly next time. On pre-Kraken versions, null
>>> dentries can also be left behind after file deletions when the
>>> deletion is replayed on a standbyreplay MDS
>>> (http://tracker.ceph.com/issues/16919)
>>>
>>> John
>>>
>>>
>>>
>>>>
>>>> Xiaoxi
>>>> _______________________________________________
>>>> ceph-users mailing list
>>>> ceph-users@xxxxxxxxxxxxxx
>>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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