M/R errors

[davisford]

When I try the m/r examples, sometimes it returns a result, and sometimes it returns an error, that might look like this:

riak.add('tweets').map(loveTweets).reduce(countTweets).run()
undefined
> { [Error: HTTP error 500: {"phase":0,"error":"[preflist_exhausted]","input":"{ok,{r_object,<<\"tweets\">>,<<\"195357732499488769\">>,[{r_content,{dict,6,16,16,8,80,48,{[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[]},{{[],[],[[<<\"Links\">>]],[],[],[],[],[],[],[],[[<<\"content-type\">>,97,112,112,108,105,99,97,116,105,111,110,47,106,115,111,110],[<<\"X-Riak-VTag\">>,53,118,80,49,68,56,99,51,112,118,108,48,101,77,85,66,120,49,121,122,107,55]],[[<<\"index\">>]],[],[[<<\"X-Riak-Last-Modified\">>|{1335,411887,982894}]],[],[[<<\"X-Riak-Meta\">>]]}}},<<\"{\"user\":\"SwaggieMiller\",\"tweet\":...\">>}],...},...}","type":"forward_preflist","stack":"[]"}] statusCode: 500 }

There are about 3000 bieber tweets in my database, and when the re-reduce does finish successfully, it reports 179. Do you know why it errors out sometimes? It might be worth adding commentary in the book about this.

[roidrage]

This seems to be an issue with Riak itself. There's an open issue and some instruction on how to work around this issue over here: basho/riak_pipe#44