Michael McDaniel riak at autosys.us
Sun Oct 18 21:08:52 EDT 2009

On Thu, Oct 15, 2009 at 10:15:48AM -0400, Justin Sheehy wrote:
> Hello,
> We have just pushed riak-0.6 to the bitbucket repo.  A summary of changes:
> >From Riak 0.5 to Riak 0.6 there were minor performance enhancements, a
> new in-memory storage backend, a streaming interface to map/reduce,
> and a few bug fixes.  In a little more detail:
>  - The R, W, and DW parameters for client requests are now exposed in
>    all of the various jiak client libraries.
>  - There is a new in-memory-only backend based on gb_trees which is
>    faster than the ets_backend for many common uses.
>  - Some bugs were fixed, such as proper handling of an empty ringstate
>    directory when pruning.
>  - The "bucket_mod" schema parameter can now be set over the HTTP interface.
>  - Numerous space and time improvements around basic FSM operations, such as
>     - Using nodes() instead of net_adm:ping() to find reachable nodes.
>     - Doing less work making vtags
>     - Using shorter, fixed-size client ids in vclocks
>  - The map/reduce system now allows streaming to and from clients,
>    allowing for indefinitely-sized input and output sets.  This is
>    only partially documented now, but those wishing to use it
>    immediately should see that riak_client:mapred is now implemented
>    in terms of riak_client:mapred_stream.
>  - The riak_get_fsm now exits much more quickly in the common case,
>    which causes cleanup activity such as read-repair and
>    delete-finalization to happen faster.  There is no longer a "delete
>    window" of any noticable time between the success of a delete
>    operation and when the document is actually removed from storage.
>  - There is a new bucket parameter, "chash_keyfun", allowing
>    per-bucket configuration of the consistent hashing function.
>    (that function must still have the type f({Bucket,Key}) -> 160bit-binary)
> Starting now, you should expect to see changes hitting the public repository
> much more frequently, as we have adjusted the development model at Basho
> such that most work is done directly against the tip of that repo.
> Enjoy!
> -Justin

 Thank you for your continued support and enhancements.


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