Custom hashing (partitioning) functions

Sean Cribbs sean at basho.com
Tue Jan 21 10:25:27 EST 2014


Sargun,

That might indeed be a bug. Would you file it on the issue tracker?
https://github.com/basho/riak_kv/issues


On Mon, Jan 20, 2014 at 3:08 PM, Sargun Dhillon <sargun at sargun.me> wrote:

> So, I don't know how many people are aware of if, but Riak supports
> custom hashing (partitioning) functions. It's exposed as a bucket
> property (chash_keyfun), in which you can deploy your own code to hash
> keys to ensure data locality to specific vnodes. This can come in
> handy when doing custom mapreduce jobs, riak_pipe, or riak_core
> applications.
>
> After playing around with this feature set quite a bit recently, it
> seems like there are some places that don't entirely respect this.
> Specifically, the place where I'm looking at right now is
> riak_kv_pipe_get, when try_preflist gets called (if try_partition
> falls through), it falls back to riak_core_util:chash_key (L188), as
> opposed to looking at the riak_pipe chashfun, or the bucket chashfun.
> What's the approach that most people have taken here with custom hash
> functions?
>
> _______________________________________________
> riak-users mailing list
> riak-users at lists.basho.com
> http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
>



-- 
Sean Cribbs <sean at basho.com>
Software Engineer
Basho Technologies, Inc.
http://basho.com/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.basho.com/pipermail/riak-users_lists.basho.com/attachments/20140121/e74cbae1/attachment.html>


More information about the riak-users mailing list