Hey Bryan,
That's awesome -- with the Riak 1.1 output figuring out the problem
would've been a snap. Thanks!
Mat
On Wed, Feb 1, 2012 at 13:36, Bryan Fink <br...@basho.com> wrote:
> On Wed, Feb 1, 2012 at 11:43 AM, Matthew A. Brown <mat.a.br...@gmail.com>
> wrote:
>> Thanks much for the info. We're running Riak 1.0.3. I think in our
>> case what would've made this easier to track down would have been not
>> having the error output cut off in the log -- since the inputs to the
>> reduce comprised a pretty large set, the output cut off before the
>> call trace, which appears after the dump of the inputs. It was pretty
>> easy to track down once I narrowed down the inputs to a manageable
>> size that still reproduced the error.
>
> Agreed - it's so hard to know how much context is useful, and how much
> is too much. However, I think you'll find that the upcoming Riak 1.1
> release already does much better in this situation.
>
> I just created a small sample to reproduce what you found, where I
> have a reduce function that calls bryan:does_not_exist/0, which is
> undefined. In 1.0.3, as you reported, you see no indication of error
> in the return value, and useless spew on the error console like:
>
> 13:26:43.720 [error] error:undef done():
> [...so many inputs that the stack trace is omitted...
>
> In the upcoming 1.1 release, using the HTTP interface at /mapred, you
> receive a JSON object like:
>
> {"phase":0,
>
> "error":"{undef,[{bryan,does_not_exist,[]},{riak_kv_w_reduce,reduce,3},{riak_kv_w_reduce,done,1},{riak_pipe_vnode_worker,wait_for_input,2},{gen_fsm,handle_msg,7},{proc_lib,init_p_do_apply,3}]}"
> "inputs":...}
>
> As well as a much more informational message on the error console:
>
> 13:27:48.143 [error] gen_fsm <0.1484.0> in state wait_for_input
> terminated with reason: call to undefined function
> bryan:does_not_exist/0 from riak_kv_w_reduce:reduce/3
>
> Hope this helps,
> Bryan
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