Hello, recently we have had an issue with deleted objects in Riak.
We use erlang mapreduce to access some buckets, and few days ago we discover
error report, our mapreduce
failed with function_clause. Input was this:
{input,{{ok,{r_object,<<"superbucket">>,<<"superkey">>,[{r_content,{dict,4,16,16,8,80,48,{[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[]},{{[],[],[],[],[],[],[],[],[],[],[[<<"X-Riak-VTag">>,49,115,99,102,120,103,69,82,73,99,84,100,119,119,49,119,50,49,105,81,89,57]],[[<<"index">>]],[[<<"X-Riak-Deleted">>,116,114,117,101]],[[<<"X-Riak-Last-Modified">>|{1354,752824,36644}]],[],[]}}},<<>>}],[{<<190,21,164,158,80,133,79,1>>,{3,63521972024}}],{dict,1,16,16,8,80,48,{[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[]},{{[],[],[],[],[],[],[],[],[],[],[],[],[],[],[[clean|true]],[]}}},undefined},undefined},[{1450083655789255239155218544960687058564870569984,'riak@10.0.1.192'}]}}
This error was reproducible several days, before i try to read this object
without mapreduce.
Read gave me {error,notfound}, after that mapreduce error disappear.
I suppose that this is some kind of read-repair, which was not triggered by
mapreduce, but we didnt have any riak failures in the past.
P.S. riak-1.2.1-1 on ubuntu 12.04 and bitcask backend.
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