Thank you for the answers! They are really helpful! Best regards, Anton Podviaznikov
On 1 October 2011 13:56, Jeremiah Peschka <[email protected]>wrote: > You can search the archives with a very gmail style interface over at > http://markmail.org. Use the search filter list:com.basho.lists.riak-users > > Object versioning can be done in as many ways as you'd like ;) It's going > to be a matter of working within your data model and defining how you'd like > it to work. Since you probably don't want to use object sibling (trust me, > you don't), you can play tricks with keys and use a meaningful key plus the > timestamp, or a version number, much like is done with software. > > Another option would be to keep a separate version bucket and store > versioned objects in there. This would involve two saves on your part (one > for the original object being pushed into the version bucket and one for the > new version) but I can't see an easier way. > > Finally, there's no easy way that I know of to retrieve all links in a > hierarchy. Just like you can't tell a relational database "I have this row, > give me every row that's related to this row in some way" (the hell of > recursive CTEs not considered), Riak has no such functionality. You can, > however, write a looping query to perform this search for you. > > Instead you could use the new secondary indexes feature and index your > versions with a single value for easy identification. All versions of a > document have an index on a canonical name for the document - this could be > an ISBN, URL, internal identifier. Then querying for older versions becomes > a matter of performing a secondary index query and finding the right objects > rather than walking a link hierarchy that could end up being cyclical if you > aren't careful. > > --- > Jeremiah Peschka - Founder, Brent Ozar PLF, LLC > Microsoft SQL Server MVP > > On Oct 1, 2011, at 7:44 AM, Anton Podviaznikov wrote: > > > Hi, > > > > I just starting to use Riak and have following situation: > > > > I want to store some JSON documents inside Riak. After updating document > I want to save new copy in the same bucket with the link to the "parent" > revision. > > > > Then my task is to retrieve all revisions for the specified document. > > However I didn't find any examples how to do this if I don't know the > depth of the tree (amount of revisions), there are just examples hot to > achieve first linked document or second. Do you have any hints? > > > > One more question: are there any patterns for storing versioned objects > inside Riak? Any previous discussion on this list? > > > > P.S. Since probably these question was asked previously can you suggest a > way how to make search over this mailing list? I see archive ( > http://lists.basho.com/pipermail/riak-users_lists.basho.com/) but don't > know how to search it. > > > > Thank you in advance! > > > > Best regards, > > Anton Podviaznikov > > _______________________________________________ > > riak-users mailing list > > [email protected] > > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com > > -- Best regards, Anton Podviaznikov
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