Kevin and Sean,

2010/9/20 Kevin Smith <ksm...@basho.com>:
> js_reload will force a reload of all the Javascript VMs. This will dump all 
> state, including any accumulated anonymous functions. We do cache anonymous 
> functions to reduce the number of JS calls we have to make but it's possible 
> there's a bug in the change detection logic. I will take a look in that code 
> and see if we're doing anything obviously wrong. What version of Riak are you 
> using?

Oh, ok.  I'm running on tip from 2 weeks ago or so:

ftreacy @ ~/work/sandbox/riak
 =>  hg summary
parent: 1564:6ffd0ec62536 tip
 Bug 640: remove extra net_kernel:hidden_connect_node() call
branch: default
commit: (clean)
update: (current)

2010/9/20 Sean Cribbs <s...@basho.com>:
> Also, your query may have hit some "not_found" objects - you'll probably want 
> to filter those out in the reduce phase using values = 
> Riak.filterNotFound(values);  That could be the source of some errors.

Good advice; well, it's locally-run test data that happens never to be
removed - but maybe at some point a vnode is lacking a value that
returns a not_found that when not caught throws this failed_reduce? No
idea how likely that is. I filter these out in most of my reduces
anyway ( if not v.not_found then ... ).

Thanks again.
Francisco

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