Hi Everyone
Spent a bit of time trying to debug this one and not sure were to from here.
The use case that appears to cause this breakage is a web page that links to 8
x 10MB images and it attempts to fetch them simultaneously.
Occasionally, one or two of the images will just fail to load, while other
times they all work file. I’ve tracked it down to the crash below. It isn’t
always the same image. To make the problem more repeatable, I forced our load
balancer into only using a single Riak-CS node, so it will be getting hit with
all the requests. We are using HAProxy out the front and are running SmartOS
64-bit images across the board.
arekinath helped me look into it and one thought was that I was hit by the AAE
bug prior to 1.4.8, but even clearing the AAE made no difference. The n-val on
the buckets is 3 and its a 4-node cluster. All 4 nodes have both a Riak and a
Riak-CS node on it. I also have pb_backlog turned up to 256,
n_val_1_get_requests set to true and fold_objects_for_list_keys set to true.
‘ring-status’ shows that the whole ring is reachable.
Any idea on how to diagnose this one further?
2014-07-17 06:38:54 =CRASH REPORT====
crasher:
initial call: mochiweb_acceptor:init/3
pid: <0.26119.1>
registered_name: []
exception exit:
{{normal,{gen_fsm,sync_send_event,[<0.27617.1>,get_next_chunk,infinity]}},[{gen_fsm,sync_send_event,3,[{file,"gen_fsm.erl"},{line,214}]},{riak_cs_wm_utils,streaming_get,4,[{file,"src/riak_cs_wm_utils.erl"},{line,272}]},{webmachine_decision_core,'-make_encoder_stream/3-fun-0-',3,[{file,"src/webmachine_decision_core.erl"},{line,667}]},{webmachine_request,send_stream_body_no_chunk,2,[{file,"src/webmachine_request.erl"},{line,334}]},{webmachine_request,send_response,3,[{file,"src/webmachine_request.erl"},{line,398}]},{webmachine_request,call,2,[{file,"src/webmachine_request.erl"},{line,251}]},{webmachine_decision_core,wrcall,1,[{file,"src/webmachine_decision_core.erl"},{line,42}]},{webmachine_decision_core,finish_response,3,[{file,"src/webmachine_decision_core.erl"},{line,92}]}]}
ancestors: [object_web_mochiweb,riak_cs_sup,<0.143.0>]
messages: []
links: [<0.298.0>,#Port<0.12015>]
dictionary:
[{reqstate,{wm_reqstate,#Port<0.12015>,[{'content-encoding',"identity"},{'content-type',"application/octet-stream"},{resource_module,riak_cs_wm_object}],undefined,"10.4.242.1",{wm_reqdata,'GET',http,{1,1},"10.4.242.1",undefined,[],"/buckets/<the
bucket
name>/objects/bf15f98c-eaa1-4ff9-83ff-24c1e7e1380f%2F847c340cfe2f44028d6fd5606f696796%2FAttachment-1.png","/buckets/<the
bucket
name>/objects/bf15f98c-eaa1-4ff9-83ff-24c1e7e1380f%2F847c340cfe2f44028d6fd5606f696796%2FAttachment-1.png?Signature=U0By3mIwaRIVBHNcYhSt6r5QgPk%3D&Expires=1405580057&AWSAccessKeyId=DGTXHHWIEDF4XUBSBYVI",[{bucket,"<the
bucket
name>"},{object,"bf15f98c-eaa1-4ff9-83ff-24c1e7e1380f%2F847c340cfe2f44028d6fd5606f696796%2FAttachment-1.png"}],[],"../../../..",{200,undefined},1073741824,67108864,[{"_ga","GA1.3.643660316.1404789703"}],[{"Signature","U0By3mIwaRIVBHNcYhSt6r5QgPk="},{"Expires","1405580057"},{"AWSAccessKeyId","DGTXHHWIEDF4XUBSBYVI"}],{9,{"cookie",{'Cookie',"_ga=GA1.3.643660316.1404789703"},{"accept-language",{'Accept-Language',"en-US,en;q=0.8"},{"accept-encoding",{'Accept-Encoding',"gzip,deflate,sdch"},{"accept",{'Accept',"image/webp,*/*;q=0.8"},nil,nil},nil},{"connection",{'Connection',"keep-alive"},nil,nil}},{"referer",{'Referer’,”<the
referrer>"},{"host",{'Host’,”<our riak-cs host
name>"},nil,nil},{"user-agent",{'User-Agent',"Mozilla/5.0 (Macintosh; Intel Mac
OS X 10_10_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153
Safari/537.36"},nil,{"x-rcs-rewrite-path",{"x-rcs-rewrite-path","/<the bucket
name>/bf15f98c-eaa1-4ff9-83ff-24c1e7e1380f/847c340cfe2f44028d6fd5606f696796/Attachment-1.png?AWSAccessKeyId=DGTXHHWIEDF4XUBSBYVI&Expires=1405580057&Signature=U0By3mIwaRIVBHNcYhSt6r5QgPk%3D"},nil,nil}}}}},not_fetched_yet,false,{3,{"content-type",{"Content-Type","application/octet-stream"},nil,{"etag",{"ETag","\"a3a32cf5d8f502d7e8d35fd8412a6878\""},nil,
trap_exit: false
status: running
heap_size: 28657
stack_size: 24
reductions: 80773
neighbours:
Thanks,
Dave Finster
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