[Storagesync] recent issues discussed (html)

["Fei Song" <[e-mail]>]

Here is the latest version. Please email me if anything is missing:
 
1.         The design targets of WebDAV, rsync and other existing approaches?
2.         The potential use cases of ISS, such as client/server, git-like pattern, svn, etc.
3.         The efficiency improvements might be the second goal for standardizing ISS protocol
4.         CORS headers on storage sync APIs
5.         What is needed for the ISS: a sync protocol or a generalized API
6.         remoteStorage draft discussion
a)         relationship vs WebDAV
b)         MOVE action (synchronization) should be added or not
c)         Beside web browser, desktop apps (by hacking way)
d)         comics of new standard
e)         etag issues
                         i.              is mainly for identifying whether a document is changed or not
                       ii.              is easy to implement than that of WebDAV sync protocol or not
                      iii.              the metadata file contains all etags for all files at both client and server side or not
f)          the distributed peer model (no server) and C/S mode
g)         a fancy example (with pics) of OfflineIMAP’s sync process in following URL
http://blog.ezyang.com/2012/08/how-offlineimap-works/
7.         GitHub (instead of email messages) has been created:
https://github.com/labkode/Internet-Storage-Sync
a)         What is the topic? 
                         i.              Whether it is suitable to build on WebDAV
                       ii.              WebDAV vs remoteStorage
                      iii.              Advantages vs disadvantages of WebDAV
8.         Metadata and data separation scheme and platform for synchronization
a)         ownCloud when configured to use an Object Storage as the Primary User Storage. (Metadata is handled by a MySQL database)
b)         CERN EOS Storage System. (Metadata is handled in high performance in-memory structures).
c)         DropBox. (As far as I know it uses S3 behind. For metadata it is unknown, but probably not on S3). 
Paper for analyzing DropBox:
http://annasperotto.org/papers/2012/imc140-drago.pdf
d)         ClawIO will have an implementation of this approach in the next phase using Swift.
9.         Whether we should keep metadata history or modification history or action history at server side (or other places)
10.     How to handle the “conflict resolution” issues
a)         A good demonstration of this issue was given in details (File F, Client A, Client B, etc.)
b)         Should it be a layer above syncing
c)         Should it depend on the use case
d)         Should it be a one-size-fits-all approach
 
 
Some related organizations, events, projects, etc.: 
GEANT community, OpenCloudMesh, ownCloud, CS3, remoteStorage, ClawIO, crosscloud, Dropbox, CERN EOS Storage System,to be added…