ui and backend error when running _sum reduce on 200k items

Client-side error-report for user "Administrator" on node 'ns_1@10.113.13.121':
User-Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_7) AppleWebKit/534.30 (KHTML, like Gecko) Chrome/12.0.742.122 Safari/534.30
Browser client XHR failure encountered. (age: 15024) Diagnostic info:
s: {"url":"/couchBase/default/%24dev_test_view_on_10k_docs-ccb128e-f371798-7976?null&_=1311836600943","isLocal":false,"global":true,"type":"GET","contentType":"application/x-www-form-urlencoded","processData":true,"async":true,"accepts":

{"xml":"application/xml, text/xml","html":"text/html","text":"text/plain","json":"application/json, text/javascript","*":"*/*","script":"text/javascript, application/javascript, application/ecmascript, application/x-ecmascript"}

,"contents":{},"responseFields":

{"xml":"responseXML","text":"responseText"}

,"converters":

{"text html":true}

,"jsonp":"callback","timeout":30000,"cache":false,"data":"null","dataType":"json","dataTypes":["json"],"crossDomain":false,"hasContent":false}
xhrStatus: timeout,
errMsg: timeout,
statusCode: 0,
responseText:
undefined
menelaus_web102 ns_1@10.113.13.121 00:04:05 - Thu Jul 28, 2011
Server error during processing: ["web request failed",

{path, "/couchBase/default/_design/$dev_one/_view/one"}

,

{type,error}

,

{what,badarg}

,
{trace,
[{erlang,list_to_binary,
[[

{couch_query_servers,builtin_stats, [reduce, [[[1000, <<"$dev_test_view_on_10k_docs-ccb128e-f371798-348">>], null]]]}

,

{couch_query_servers,builtin_reduce,4}

,

{couch_query_servers,reduce,3}

,

{couch_view_group, '-init_group/4-fun-1-',4}

,

{couch_btree, '-write_node/3-lc$^0/1-0-',5}

,

{couch_btree,write_node,3}

,

{couch_btree,modify_node,5}

,

{couch_btree,query_modify,4}

]]},

{couch_httpd,error_info,1}

,

{couch_httpd,send_error,2}

,

{couch_httpd,handle_request_int,6}

,

{menelaus_web,loop,3}

,

{mochiweb_http,headers,5}

,