Alex, We require bucket types for the write-once feature for the same reason we require them for datatypes or strong consistency: this is a property that changing after data has been written could have undefined behavior. Making there be an explicit creation/activation of the bucket-type ensures that the behavior on the namespace created by the bucket-type never changes. However, old or "default" buckets may be changed at any time -- meaning we can't ensure safety of any property changes.
On Thu, Apr 16, 2015 at 3:50 PM, Alex De la rosa <alex.rosa....@gmail.com> wrote: > "The write_once property is applied to a bucket type"... why only on > bucket types? > > ex: RIAK.bucket_type('my_type').bucket('my_bucket').get('my_key') > > Normally I use bucket types to use mutable data like Maps/Sets/Counters... > so I can update its contents (multiple writes) and when I have static data > I use a basic buckets: > > ex: RIAK.bucket('my_bucket').get('my_key') > > It makes much more sense to me to have write_once capabilities in this > kind of bucket that not in a bucket type bucket. I can imagine the use of a > bucket type just for indexing data in Solr and not change it... but I think > simple buckets would benefit of this feature even more. > > Thanks! > Alex > > On Thu, Apr 16, 2015 at 10:40 PM, Matthew Brender <mbren...@basho.com> > wrote: > >> Riak 2.1 is available [1]! Let’s start with the most fun part. >> >> >> ## New Feature >> Riak 2.1 introduces the concept of “write once” buckets, buckets whose >> entries are intended to be written exactly once, and never updated or >> over-written. The write_once property is applied to a bucket type and >> may only be set at bucket creation time. This allows Riak to avoid a >> "read before write" for write_once buckets only. More information, as >> always, is available in the docs [2] >> >> >> ## Other updates >> There are a number of GitHub Issues closed with the 2.1 release. Some >> noteworthy updates: >> >> * A nice solution for a corner case that could result in data loss [3] >> * A public API related to riak_core_ring_manager thanks to Darach Ennis! >> [4] >> * A JSON writer for a number of riak_admin commands - see commit for >> details [5] >> * Updates to Yokozuna (Riak’s Solr integration) that include >> additional metrics thanks to Jon Anderson! [6] >> >> Be sure to see the full Release Notes here [7] and the Product Advisories >> [8]. >> >> ## Upgrading >> Be sure to review documentation [7] before an upgrade. It’s worth >> noting that all nodes in a cluster must be at 2.1 before you set the >> write_once property on a bucket. >> >> It’s worth noting that there is a known issue with Yokozuna that >> causes entry loss on AAE activity [9]. Please keep this in mind before >> upgrading. >> >> >> ## Feedback please >> Do you have a use case where write_once could be helpful? Please reply >> to me directly! I would love to learn about your environment and be >> able to share more details with you. >> >> Thanks, >> Matt >> Developer Advocate >> twitter.com/mjbrender >> >> >> [1] http://docs.basho.com/riak/latest/downloads/ >> [2] http://docs.basho.com/riak/latest/dev/advanced/write-once >> [3] https://github.com/basho/riak_kv/issues/679 >> [4] https://github.com/basho/riak_core/pull/716 >> [5] >> https://github.com/basho/clique/commit/0560e7a135d9a1e77646384681ae88baf0cba31a >> [6] https://github.com/basho/riak_kv/pull/855 >> [7] https://github.com/basho/riak/blob/develop/RELEASE-NOTES.md >> [8] http://docs.basho.com/riak/latest/community/product-advisories/ >> [9] https://github.com/basho/yokozuna/issues/481 >> ᐧ >> >> _______________________________________________ >> riak-users mailing list >> riak-users@lists.basho.com >> http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com >> > > > _______________________________________________ > riak-users mailing list > riak-users@lists.basho.com > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com > > -- Sean Cribbs <s...@basho.com> Technical Lead, Riak Basho Technologies, Inc. http://basho.com/
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