On Nov 29, 2010, at 12:15 PM, Dan Reverri wrote:
> Note the following from the article:
> "The important thing to understand is that the function defining the reduce
> phase may be evaluated multiple times, and the input of later evaluations
> will include the input of earlier evaluations."
>
> Based on your defined reduce function it looks like you are trying to count
> the number of objects in the "test" bucket. Rather than return the length of
> the incoming list it would be better to sum the values of the incoming list
> using "reduceSum":
> https://github.com/basho/riak_kv/blob/master/priv/mapred_builtins.js#L66
I logged the incoming data and since I'm getting a mixture of objects and sums
(so far) in the reduce input, I did this to account for both kinds of data
coming into the function in a single parameter:
function(v){
var count=0;
for(i in v){
if(typeof v[i] === 'object'){
count += 1;
} else {
count += v[i];
}
}
ejsLog('/tmp/mapred.log','r: '+JSON.stringify(v));
return [count];
}
I'm not sure I understand how I can separate the objects from the reduce return
values using reduceSum.
jb
>
> Thanks,
> Dan
>
> Daniel Reverri
> Developer Advocate
> Basho Technologies, Inc.
> [email protected]
>
>
> On Mon, Nov 29, 2010 at 7:08 AM, Jon Brisbin
> <[email protected]> wrote:
>
> On Nov 29, 2010, at 8:59 AM, David Smith wrote:
>
> > On Mon, Nov 29, 2010 at 7:43 AM, Jon Brisbin
> > <[email protected]> wrote:
> >> I'm working on the Spring Data and Grails Gorm support for Riak and I'm
> >> seeing some problems running my tests against Riak 0.13. I don't see these
> >> problems when running 0.12.
> >
> > Can you elaborate on the problems you're seeing, please?
>
> There's two problems I'm seeing, one is with map/reduce, the other is that
> the server will crash under the load the tests put on it (I'll send a
> separate email with steps to reproduce).
>
> Here's an example of a problem I'm seeing in M/R (from an earlier message):
>
> I'm seeing some weird behavior with map/reduce in 0.13 versus 0.12 and I'm
> not sure what's going on here. I'm hanging out in the chat room right now
> trying to find out, but basically, if I run this test case against 0.13 I get
> a completely different result than what I get in 0.12:
>
> http://pastie.org/1320874
>
> In 0.12, I get [1] in 0.13 I get [2].
>
> The output I'm logging looks like this for 0.12:
>
> 11/23/2010 (13:39:47):
> map={"bucket":"test","key":"test","vclock":"a85hYGBgzGDKBVIsTE+lb2UwJTLmsTLUTEk4xpcFAA==","values":[{"metadata":{"Links":[],"X-Riak-VTag":"5qaBBTXfdEQUyCBTDRRIQ7","content-type":"application/json","X-Riak-Last-Modified":"Tue,
> 23 Nov 2010 19:39:40
> GMT","X-Riak-Meta":[]},"data":"{\"test\":\"value\",\"integer\":12}\n"}]}
> 11/23/2010 (13:39:47): reduce=[1]
>
> And this in 0.13:
>
> 11/23/2010 (13:46:52):
> map={"bucket":"test","key":"test","vclock":"a85hYGDgzmDKBVIsjDI+7RlMiYx5rAz9ExKO8UGE2ZqTWGZL10AlRCfBJVgYLplNxhQGqmeMbn4EldBEUs/k7LodUxionils9l2oRBGy+cHJ7zGFgeqZk3faQCVOT0aoZzG1PohFmNWr8CxUWGUaijFv+lYiS2QBAA==","values":[{"metadata":{"Links":[],"X-Riak-VTag":"If4qIgutNTerbEmxiKLhR","content-type":"application/json","X-Riak-Last-Modified":"Tue,
> 23 Nov 2010 19:46:44
> GMT","X-Riak-Meta":[]},"data":"{\"test\":\"value\",\"integer\":12}\n"}]}
> 11/23/2010 (13:46:52): reduce=[]
> 11/23/2010 (13:46:52): reduce=[1,0]
>
> I tried Homebrew (OS X 10.6) and the OS X download packages of both versions.
>
> Jon Brisbin
> Portal Webmaster
> NPC International, Inc.
>
>
>
>
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>
Jon Brisbin
Portal Webmaster
NPC International, Inc.
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