Riak 0.7 Released

Andy Gross andy at basho.com
Wed Dec 23 11:23:27 EST 2009

It's been pushed to http://hg.basho.com/riak for a few days, but here are
the official releasenotes.  Enjoy!

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.
  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
  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}}
  by a single {ReqId, done} to notify the client that all keys have been

- riak_vnode has undergone a complete rewrite to fix some handoff-related
  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,
  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
  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.
  function will attempt to to produce an "optimal" claim for the N-value
  by the "target_n_val" configuration parameter (3, by default).

- The latest version of Webmachine (http://webmachine.basho.com) 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
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