riak mapreduce failure

Jonathan Langevin jlangevin at loomlearning.com
Thu Jul 7 02:30:01 EDT 2011


BTW, I didn't see this actually covered in the wiki, but in my testing just
now, I found that instead of "source" you can pass "name" and specify an
existing JS function (of which Riak has several included to assist with map
& reduce phases). (Sadly, the provided JS functions have no code comments,
lol...)

Ex:

root at dev:~# curl -i -d
'{"inputs":"test","query":[{"map":{"language":"javascript","name":"Riak.mapValuesJson","keep":true}}]}'
-H "Content-Type: application/json" http://127.0.0.1:8098/mapred
HTTP/1.1 200 OK
Server: MochiWeb/1.1 WebMachine/1.7.3 (participate in the frantic)
Date: Thu, 07 Jul 2011 06:22:00 GMT
Content-Type: application/json
Content-Length: 53

[{"name":"John Smith","age":28,"company":"Facebook"}]
*


You can view the pre-built JS functions here:
https://github.com/basho/riak_kv/blob/master/priv/mapred_builtins.js

<http://www.loomlearning.com/>
Jonathan Langevin
Systems Administrator
Loom Inc.
Wilmington, NC: (910) 241-0433 - jlangevin at loomlearning.com -
www.loomlearning.com - Skype: intel352
*


On Thu, Jul 7, 2011 at 2:15 AM, Jonathan Langevin <
jlangevin at loomlearning.com> wrote:

> I've not attempted map/reduce before, so this was a learning experience for
> me.
> Pay attention to the brackets in the function :-)
>
> root at dev:~# curl -i -d
> '{"inputs":"test","query":[{"map":{"language":"javascript","source":"function(val)
> { return [val]; }","keep":true}}]}' -H "Content-Type: application/json"
> http://127.0.0.1:8098/mapred
> HTTP/1.1 200 OK
> Server: MochiWeb/1.1 WebMachine/1.7.3 (participate in the frantic)
> Date: Thu, 07 Jul 2011 06:13:59 GMT
> Content-Type: application/json
> Content-Length: 690
>
> [{"bucket":"test","key":"riak_developer_1","vclock":"a85hYGCQz2DKBVJszUkMW8O6MpgSGfNYGTSKI4/zQSRYWB2KzmIKA9Wzebeeg0p0I6ln4FbowBQGmf9BVxQqoVqCpN7QaDmmMFA9s+V0CaiEYBlCPXvl6buYwkD1rF7SbFCJ3RVI5t9el4wpDFTPftr/F1TiHZJ6lu1OWzCFQe5/uAlmvmUlQj2TGB8DpjBQPcvrpSpQifoqhHq2+27cmMKg8DTtvQCVaKtGUs/WcgpTGKieyeHuF6jElhqk8Dnlch2LMKvTDwdMYZAxrxNSoBLLahHqGU+xOwGFmVCFQdHyf4oCVP1aVAnBPfswJVhYz562hBqEInzq1mVMYVA0mn68BDXGRCsKEY0v38dgEWZc4dsOFb5mG4UcWzd+70OWyAIA","values":[{"metadata":{"Links":[],"X-Riak-VTag":"7FfI4n3AtRNBPjLymMbvoJ","content-type":"text/json","X-Riak-Last-Modified":"Wed,
> 01 Jun 2011 04:36:38 GMT","X-Riak-Meta":[]},"data":"{\"name\":\"John
> Smith\",\"age\":28,\"company\":\"Facebook\"}"}]}]
> *
>
>
>  <http://www.loomlearning.com/>
>  Jonathan Langevin
> Systems Administrator
> Loom Inc.
> Wilmington, NC: (910) 241-0433 - jlangevin at loomlearning.com -
> www.loomlearning.com - Skype: intel352
> *
>
>
>
> On Wed, Jul 6, 2011 at 11:53 PM, Matt Graham <mdg149 at gmail.com> wrote:
>
>> curl -i -d
>>
>> '{"inputs":"test","query":[{"map":{"language":"javascript","source":"function(value)
>> { return value; }","keep":true}}]}' -H "Content-Type:
>> application/json" http://127.0.0.1:8098/mapred
>>
>
>
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