This is good info, I submitted a doc patch to capture this in the Swift admin guide: https://review.openstack.org/19046
Lorin On Fri, Jan 4, 2013 at 1:27 PM, John Dickinson <[email protected]> wrote: > It's pretty simple. Swift uses the underlying filesystem to store the data > on disk, and so you can use normal FS tools to find and inspect your data. > > For the object server, the "magic" happens here: > https://github.com/openstack/swift/blob/master/swift/obj/server.py#L117 > > The end result is that the data is stored here: > > /path/to/mount/points/device/objects/partition/hash_suffix/hash/ > > That directory is the object. Inside the directory, there is normally just > one file (named <timestamp>.data). The object's data is stored in the file, > and the object's metadata is stored in the xattrs of the file. > > In some cases (mostly around failure handling), there may be more than one > file in that directory, but for the general case, all the .data files are > sorted (by filename) and the last is chosen (ie the most recent). As I > said, there is normally just the one file in there. > > If you delete the object, the .data file is deleted and a <timestamp>.ts > ("ts" for "tombstone") file is created as a zero-byte file. This is a > delete marker that will be eventually reaped, but it exists to ensure that > the delete properly propagates to all replicas in the cluster. > > --John > > > > On Jan 4, 2013, at 10:14 AM, "Snider, Tim" <[email protected]> wrote: > > > I’d like to understand more on how Swift lays out objects on the > underlaying storage. I can’t seem to find out much about this in the > openstack / swift documentation itself or in associated web searchs. > > Thanks for pointers / links. > > Tim > > _______________________________________________ > > Mailing list: https://launchpad.net/~openstack > > Post to : [email protected] > > Unsubscribe : https://launchpad.net/~openstack > > More help : https://help.launchpad.net/ListHelp > > > _______________________________________________ > Mailing list: https://launchpad.net/~openstack > Post to : [email protected] > Unsubscribe : https://launchpad.net/~openstack > More help : https://help.launchpad.net/ListHelp > > -- Lorin Hochstein Lead Architect - Cloud Services Nimbis Services, Inc. www.nimbisservices.com
_______________________________________________ Mailing list: https://launchpad.net/~openstack Post to : [email protected] Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
