http://lists.basho.com/pipermail/riak-users_lists.basho.com/...
http://lists.basho.com/pipermail/riak-users_lists.basho.com/...
"If large-scale mapreduce (more than a few hundred thousand keys) is important, or listing keys is critical, you might consider HBase."
"Riak can also collapse in horrible ways when asked to list huge numbers of keys. Some people say it just gets slow on their large installations. We've actually seen it hang the cluster altogether. Try it and find out!"
You want to say I'm wrong, make a specific argument. Don't selectively quote things out of context that actually don't rebut my position, as that's profoundly dishonest. It is a way of pretending to rebut someone but without saying anything yourself so you can't be pinned on any statements. It is disingenuous.
I'm really tired of having to rebut these argument-from-ignorance "rebuttals" here on HN.
Ctrl-F billions and found one match in the post I was quoting. No other reference to very large MR jobs in the post quoted.
"At Showyou, we're also building a custom backend called Mecha which integrates Riak and SOLR, specifically for this kind of analytics over billions of keys. We haven't packaged it for open-source release yet"
So the OP is supposed to use an unreleased experimental custom backend to do his big mapreduce jobs?