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We use Riak as our primary datastore at Showyou, with Redis, Solr, and Memcached helping out. The big advantage of Riak is high availability and easy management, but for sorting/listing keys, range queries, and low latency we need other datastores which maintain post-commit-hook updated indices.

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Riak provides post-commit hooks:

http://wiki.basho.com/Pre--and-Post-Commit-Hooks.html

But I assume you mean these post-commit hooks update other indices stored outside of Riak.

Yes, sorry, the wording was somewhat ambiguous. We use post-commit-hooks in riak to update external datastores, as well as callbacks within our ORM for many indexes stored in Riak itself.

Out of curiosity, did you try riak_search as a solr replacement?

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