While processing a request I am finding that I am spending most of my time
fetching data from Riak. As I am using the Ruby client I can't
parallelisethem, as it does not support non-blocking IO and I don't
want to spawn many
threads.
For these requests I am willing to accept an R of 1, so I can use a MR job
as a bulk fetch, but I would prefer to avoid the JS VM, as its rather slow
and I don't want to worry about running out of VMs at the wrong time.
I can easily fetch the values using only Erlang MR by adding the keys to my
MR object and doing
map(["riak_kv_mapreduce", "map_object_value"], :arg => [ true ], :keep
=> true).
but this gives me an array of values. I need to to know the which values
are associated with what key, and my values do not include the key or
otherwise allow me to map them.
>From looking at the Riak code there does not seem to exist an exported
Erlang map function that will return a value with its key.
Did I miss one? Is such a function somewhere in the source? If not,
anyone have one handy they'd like to share?
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