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Riak 0.7 Release Notes
- The Riak source tree has undergone a major restructuring as part of a
transition to a new build tool -- rebar. This tool enforces OTP compliant
directory structures for the riak application and its dependencies and
provides an easy-to-use wrapper around the new reltool system available in
Erlang R1303+. Using reltool makes it possible to construct a standalone
server instance that can be used on machines without Erlang installed. This
transition has also enabled us to introduce a standardized script for
starting/stopping and other server management tasks.
You can watch a screencast on Riak and Rebar here:
- In addition to the existing Client:list_keys function, there is now also
a Client:stream_list_keys function that provides the keys in a bucket over a
series of messages instead of in a single list. This can be useful with
larger buckets. The messages will be of the form {ReqId,{keys,Res}} followed
by a single {ReqId, done} to notify the client that all keys have been sent.
- riak_vnode has undergone a complete rewrite to fix some handoff-related bugs
and to eliminate the need for a separate riak_vnode_sidekick process.
- riak_stat : Riak can now track basic internal statistics about how many
reads and writes happened, and with what latency, in the last minute.
Add {riak_stat, true} to your Riak config file to enable stat tracking, then
use riak_client:get_stats/1 to retrieve the latest stats.
- Setting the bucket property "allow_mult" to 'false' enables Riak's
automatic sibling resolution. Prior to this release, all resolution was
done at read time. With 0.7, sibling resolution is done at write time for
allow_mult=false buckets.
- In fixing a bug in filtered_preflist, we also made Riak's default ring
partition claiming function more explicitly evenly distributed in 0.7. The
function will attempt to to produce an "optimal" claim for the N-value set
by the "target_n_val" configuration parameter (3, by default).
- The latest version of Webmachine ( has been
integrated into Riak, which increases HTTP/Jiak performance considerably.
- Jonathan Lee contributed a patch that causes any object metadata keys
beginning with "X-Riak-Meta" to be emitted as HTTP headers when using the
"raw" HTTP interface.
- Sean Cribbs refactored the Ruby client library to be more idiomatic and
- Jayson Baird contributed a new Python client that uses PyCURL when available.
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