This looks to be an issue with the cache used for map reduce. This is a known
bug and can be mitigated by setting map_cache_size to 0 in the riak_kv section
of your app.config. Add the following:
{map_cache_size, 0},
Grant Schofield
Developer Advocate
Basho Technologies
On Jan 30, 2011, at 5:44 PM, Constantin Teodorescu wrote:
> Using Riak 0.14.0-1_i386 on a 7 node cluster (mixed 686 & x86_64 Ubuntu and
> CentOS Linuxes)
>
> Filled a "person" bucket with more than 100.000 persons with simple "ID" ->
> "NAME" document
>
> Tried to query some data through HTTP API like that:
>
> curl -X POST -H "content-type: application/json"
> http://172.16.0.251:8098/mapred --data @findPerson.json
> having the file findPerson.json like that:
> { "inputs":{
> "bucket":"persoane",
> "key_filters":[["starts_with","26"]]
> } ,
> "query":[
> {
> "map":{
> "language":"javascript",
> "source":"function(v) {return [v.values[[0]].data+' -
> '+v.key];}"
> }
> },
> {
> "reduce":{
> "language":"javascript",
> "name":"Riak.reduceSort"
> }
> }
> ]
> }
>
> Everything worked ok, then I tried to query the database for counting
> persons, changing the query with :
> { "inputs":{
> "bucket":"orase",
> "key_filters":[["starts_with","26"]]
> } ,
> "timeout": 900000,
> "query":[
> {
> "map":{
> "language":"javascript",
> "source":"function(v) {return [1];}"
> }
> },
> {
> "reduce":{
> "language":"javascript",
> "name":"Riak.reduceSum"
> }
> }
> ]
> }
>
> The problem I got is that the answer is a mixed result from answers computed
> with the first JSON query and other computed with the second one.
> It's just like a couple of servers within the cluster have done the
> map/reduce functions USING the old javascript functions , remembering them ...
>
> How could that be possible?
> Constantin Teodorescu
>
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