[Openstack] Swift downloading only manifest of static large object (SLO)

Ben McCann ben at benmccann.com
Thu Mar 13 17:31:07 UTC 2014


Oh, you're right, I did miss the -v option. Thanks!

The curl command isn't working for me, however.

StorageURL:
https://dal05.objectstorage.softlayer.net/v1/AUTH_xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

$ curl https://dal05.objectstorage.softlayer.net/info
Bad URL





On Thu, Mar 13, 2014 at 2:59 AM, Kuo Hugo <tonytkdk at gmail.com> wrote:

> Hi Ben,
>
> 1. What's the Swift CLI version are you using for now ?
> 2. The $>swift stat -v suppose to show you the storage_url. -v means
> verbose.
> 3. There's another choice via curl
>
> ~IRON_MAN$>curl -i https://$FQDN_of_AUTH_SERVER/auth/v1.0 -H
> "X-auth-user:johndoe" -H "x-auth-key:password_of_john"
> HTTP/1.1 200 OK
> X-Storage-Url: https://swift.example.com/v1/AUTH_johndoe
> X-Auth-Token: AUTH_tk0f4473fa1234567890
> Content-Type: text/html; charset=UTF-8
> Set-Cookie: X-Auth-Token=AUTH_tk0f4473fa1234567890; Path=/
> X-Storage-Token: AUTH_tk0f4473fa1234567890
> Content-Length: 0
> X-Trans-Id: txcfefd5396a0f4f4694707-0053217efd
>
>
> And then you can send a GET to https://swift.example.com/info
>
> $> curl https://cloud.swiftstack.com/info
>
>
> One more information here, the /info was available since Swift 1.11.0
> https://github.com/openstack/swift/blob/master/CHANGELOG#L120-L125
>
>
>
>
>
> 2014-03-13 14:41 GMT+08:00 Ben McCann <ben at benmccann.com>:
>
> Thanks Samuel. That's super helpful. I didn't realize that SLO could be
>> turned on/off on the server. I thought it was merely a client-side
>> convention.
>>
>> swift stat doesn't return a StorageUrl for me. It just returns:
>>        Account:
>>     Containers:
>>        Objects:
>>          Bytes:
>>    Meta Cdn-Id:
>>    Meta Nas-Id:
>>    X-Timestamp:
>>     X-Trans-Id:
>>  Accept-Ranges:
>>
>> I'll see if I can find out from someone at SoftLayer whether they have an
>> old version or have large objects turned off unless you can think of any
>> other ways I might be able to find out by querying the server.
>>
>> Thanks,
>> Ben
>>
>>
>>
>>
>> On Wed, Mar 12, 2014 at 11:09 PM, Samuel Merritt <sam at swiftstack.com>wrote:
>>
>>> On 3/12/14 9:14 PM, Ben McCann wrote:
>>>
>>>> Hi,
>>>>
>>>> I'm attempting to download a large file which I have uploaded to
>>>> SoftLayer Object Storage using the swift tool. It's downloading only the
>>>> manifest and is not downloading the segments. Any tips on figuring out
>>>> what is going wrong?
>>>>
>>>
>>> It's entirely possible that the cluster in question lacks static large
>>> object support. Maybe they're running an old version of Swift
>>> (pre-1.8.0/Grizzly), or maybe they haven't enabled the static large object
>>> feature.
>>>
>>> What you'll need to do is probe the cluster to see if static large
>>> objects are enabled.
>>>
>>> The easy way is to politely ask the cluster with a GET request to /info.
>>> Run `swift stat -v`, then take the "StorageURL" field and change the path
>>> to be just "/info". Strip off any path that's already there.
>>>
>>> For example, if the output looks like
>>>
>>>     StorageURL: http://192.168.22.2:8080/v1/AUTH_test
>>>     Auth Token: AUTH_tk89454677b67348e09eefc1d6fe4dfa68
>>>        Account: AUTH_test
>>>     Containers: 1
>>>     [...]
>>>
>>> then you'd simply run
>>>
>>>     curl http://192.168.22.2:8080/info
>>>
>>> The response will be a JSON hash, so maybe run it through a JSON
>>> pretty-printer, e.g.
>>>
>>>     curl http://192.168.22.2:8080/info | python -mjson.tool
>>>
>>> On my development machine, the response looks something like this (some
>>> items removed for brevity):
>>>
>>> {
>>>     "container_quotas": {},
>>>     "formpost": {},
>>>     "slo": {                   <---- LOOK FOR THIS
>>>         "max_manifest_segments": 1000,
>>>         "max_manifest_size": 2097152,
>>>         "min_segment_size": 71
>>>     },
>>>     "swift": {
>>>         "account_listing_limit": 10000,
>>>         "container_listing_limit": 10000,
>>>         "max_account_name_length": 256,
>>>         "max_container_name_length": 256,
>>>         "max_file_size": 5368709122,
>>>         "max_meta_count": 90,
>>>         "max_meta_name_length": 128,
>>>         "max_meta_value_length": 256,
>>>         "max_object_name_length": 1024,
>>>         "version": "1.12.0.106.ga08e813"
>>>     }
>>> }
>>>
>>> If you don't see SLO in there, then you're out of luck. Bug Softlayer
>>> and see if they'll turn it on.
>>>
>>> Now, it's also possible that you'll get a 412 response with the body
>>> "Bad URL" when you run the curl command above. That will tell you that the
>>> cluster is running 1.11.0 or earlier, but it won't tell you anything about
>>> SLO support. In that case, try uploading a normal file (cat picture or
>>> something) with the header "X-Static-Large-Object: yes". If that succeeds,
>>> then SLO is disabled; if SLO is enabled, then the PUT will fail.
>>>
>>> A more verbose description is available here:
>>> https://ask.openstack.org/en/question/7005/static-large-objects/
>>>
>>>
>>> _______________________________________________
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>>> openstack
>>>
>>
>>
>>
>> --
>> about.me/benmccann
>>
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