Elias,
It's hard to say from just this one stacktrace but it seems that the
vnode/leveldb backend might be failing under load causing the R value to go
unmet. The Search hook has to perform a read of a special object it stores
in the backend and that's what is failing here. However, the root cause
seems to be vnodes failing. I say this because of the presence of the
`{r_val_unsatisfied,2,1}` msg. Could you check the error and crash log
files and see if you can't find other traces that might shed more light on
this?
-Ryan
On Thu, Sep 15, 2011 at 2:09 AM, Elias Levy <fearsome.lucid...@gmail.com>wrote:
> While loading some data into a test cluster I using riak 1.0.0pre2 I came
> across some sort of search related bug.
>
> The cluster is configured with 3 nodes, N is 3, W is 1, WD is 0, and I am
> connecting to protocol buffers. The program to load data can be configured
> to use one or more connections using non-blocking IO connected across the
> three nodes. I've successfully loaded several GB of data in a bucket with a
> bitcask backend using 12 concurrent connections.
>
> Then I decided to switching to a leveldb backend. When I did so, about 10
> seconds into loading data I get the following error:
>
> 2011-09-15 05:43:19.161 [error]
> <0.17255.0>@riak_kv_put_fsm:decode_precommit:607 Problem invoking pre-commit
> hook riak_search_kv_hook:precommit ->
> error:{case_clause,{error,{r_val_unsatisfied,2,1}}}
>
> [{riak_indexed_doc,put,3},{riak_search_kv_hook,precommit,1},{riak_kv_put_fsm,invoke_hook,4},{riak_kv_put_fsm,precommit,2},{gen_fsm,handle_msg,7},{proc_lib,init_p_do_apply,3}]
>
> Now, the interesting part is that if I run the program again, using the
> same input data, the loading succeeded without any errors.
>
> This occurs with some of my other input files, although sometimes I need to
> try loading them a few times before it succeeds. Maybe there are some
> records that trigger the issue, but only if a key is newly inserted?
>
> Elias Levy
>
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