Hi Ryan, thanks.
In this case I also came up with a workaround: serving those files
from disk. Which solved our user problem. I'll try out your code and
let you know how it went.
Francisco
2012/1/12 Ryan Zezeski <rzeze...@basho.com>:
> Francisco,
>
> I'm not sure how it happend, but perhaps the file was updated at some point
> and the root became a pointer to an empty tree. If you didn't already know
> Luwak keeps all old versions of your file around, but it doesn't really have
> any APIs for accessing it. Try attaching to the Riak console and run the
> following:
>
>
> {ok, C} = riak:local_client().
> {ok, F} = luwak_file:get(C, <<"filename">>).
> PrevRoot = hd(luwak_file:get_property(F, ancestors)).
> V = riak_object:get_value(F).
> V2 = lists:keyreplace(root, 1, V, {root, PrevRoot}).
> TempF = riak_object:apply_updates(riak_object:update_value(F, V2)).
> Bytes = luwak_io:get_range(C, TempF, 0, Length). % where Length is number of
> bytes you want to read
>
> I also made a gist of the above: https://gist.github.com/1602953
>
> If the first ancestor doesn't give you anything then keep moving down the
> list. Otherwise, if you do find the data you are looking for let me know
> and we'll see if we can't get your file object fixed.
>
> -Ryan
>
> On Thu, Jan 12, 2012 at 2:12 PM, francisco treacy
> <francisco.tre...@gmail.com> wrote:
>>
>> Hi Kelly,
>>
>> Yes, I had removed a node from the cluster and then forced
>> read-repair. I think it was you actually help me out a couple of
>> months ago with this.
>>
>> So far we didn't run into any other broken assets, but we need to get
>> these up. Ideas?
>>
>> Thanks,
>>
>> Francisco
>>
>> 2012/1/12 Kelly McLaughlin <ke...@basho.com>:
>> > Francisco,
>> >
>> > Is it the case that you have already tried to force read repair on the
>> > file chunks and are still seeing these errors?
>> >
>> > Kelly
>> >
>> > On Jan 12, 2012, at 10:57 AM, francisco treacy wrote:
>> >
>> >> Hi,
>> >>
>> >> One of my users is preparing an exam but can't load an image because
>> >> Luwak is serving it broken (i.e. responds with HTTP 200; 0 bytes)
>> >>
>> >> Visibly caused by a non-existing chunk of that file on that partition.
>> >> I would've expected read-repair to kick in and update the value. But
>> >> it keeps on serving 0 bytes.
>> >>
>> >> Why is this happening and how can I fix it?
>> >>
>> >> Thanks,
>> >>
>> >> Francisco
>> >>
>> >>
>> >> =CRASH REPORT==== 12-Jan-2012::18:42:29 ===
>> >> crasher:
>> >> initial call: luke_flow:init/1
>> >> pid: <0.16316.2941>
>> >> registered_name: []
>> >> exception exit:
>> >>
>> >> {error,{phase_error,{error,{throw,{function_clause,[{riak_object,get_value,[{error,notfound}]},{luwak_get_stream,-map_fun/0-fun-0-,3},{riak_kv_mapper,run_map,9},{riak_kv_mapper,-do_map/2-fun-0-,9},{lists,foldl,3},{riak_kv_mapper,do_map,2},{gen_fsm,handle_msg,7},{proc_lib,init_p_do_apply,3}]},[{luwak_get_stream,-map_fun/0-fun-0-,3},{riak_kv_mapper,run_map,9},{riak_kv_mapper,-do_map/2-fun-0-,9},{lists,foldl,3},{riak_kv_mapper,do_map,2},{gen_fsm,handle_msg,7},{proc_lib,init_p_do_apply,3}]}}}}
>> >> in function gen_fsm:terminate/7
>> >> in call from proc_lib:init_p_do_apply/3
>> >> ancestors: [luke_flow_sup,luke_sup,<0.10483.536>]
>> >> messages: []
>> >> links: [<0.10485.536>]
>> >> dictionary: []
>> >> trap_exit: true
>> >> status: running
>> >> heap_size: 610
>> >> stack_size: 24
>> >> reductions: 258
>> >> neighbours:
>> >>
>> >> =SUPERVISOR REPORT==== 12-Jan-2012::18:42:29 ===
>> >> Supervisor: {local,luke_flow_sup}
>> >> Context: child_terminated
>> >> Reason:
>> >>
>> >> {error,{phase_error,{error,{throw,{function_clause,[{riak_object,get_value,[{error,notfound}]},{luwak_get_stream,-map_fun/0-fun-0-,3},{riak_kv_mapper,run_map,9},{riak_kv_mapper,-do_map/2-fun-0-,9},{lists,foldl,3},{riak_kv_mapper,do_map,2},{gen_fsm,handle_msg,7},{proc_lib,init_p_do_apply,3}]},[{luwak_get_stream,-map_fun/0-fun-0-,3},{riak_kv_mapper,run_map,9},{riak_kv_mapper,-do_map/2-fun-0-,9},{lists,foldl,3},{riak_kv_mapper,do_map,2},{gen_fsm,handle_msg,7},{proc_lib,init_p_do_apply,3}]}}}}
>> >> Offender:
>> >>
>> >> [{pid,<0.16316.2941>},{name,undefined},{mfa,{luke_flow,start_link,[<10351.27714.2432>,18337056,[{riak_kv_map_phase,[],[{erlang,{map,{qfun,#Fun<luwak_get_stream.1.10025879>},{map,{riak_client,ri...@xx.165.253.xx,<<[2,139,139,84]>>},1000000,#Ref<0.0.487.249801>,<0.16313.2941>,0,76134},false}}]}],undefined,66000]}},{restart_type,temporary},{shutdown,brutal_kill},{child_type,worker}]
>> >>
>> >> _______________________________________________
>> >> riak-users mailing list
>> >> riak-users@lists.basho.com
>> >> http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
>> >
>>
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