"reason":"{<<\"shutdown\ , [{'DOWN' and eventually reason":"req_timedout when running views during rebalance operation

build 541 has the most recent fixes which was merged to epengine and couchdb

cluster has 6 nodes - 200k items - under 1k ops/sec load

rebalance hangs near completion and all view queries fail and eventually they all time out

http://10.114.237.71:8092/default/_design/dev_players/_view/players?full_set=true&connection_timeout=60000

took 1.04649209976 seconds
{"rows":[
{"key":null,"value":109441}
]}

took 3.05865216255 seconds
{"rows":[
{"key":null,"value":102793}
],
"errors":[
{"from":"http://10.202.101.172:8092/_view_merge/","reason":"{<<\"shutdown\">>,\n <<\"{gen_server,call,[<0.16751.3>,{pread_iolist,41058},infinity]}\">>}"}
]}

took 120.888384104 seconds
{"rows":[
{"key":null,"value":104536}
],
"errors":[
{"from":"http://10.202.101.172:8092/_view_merge/","reason":"{<<\"{function_clause,\\n [{couch_set_view,handle_info,\\n [{'DOWN',#Ref<0.0.116.88493>,process,<0.25834.3>,\\n {badmatch,\\n {error,\\n {badmatch,\\n {error,\\n {{badmatch,\\n {file_already_opened,\\n \\\"/mnt/default/66.couch\\\"}},\\n [{couch_db_set,'-init/1-fun-0-',4},\\n {lists,foldl,3},\\n {couch_db_set,init,1},\\n {gen_server,init_it,6},\\n {proc_lib,init_p_do_apply,3}]}}}}}},\\n {server,\\\"/mnt\\\",<0.16314.3>}]},\\n {gen_server,handle_msg,5},\\n {proc_lib,init_p_do_apply,3}]}\">>,\n <<\"{gen_server,call,\\n [couch_set_view,\\n {get_group_server,<<\\\"default\\\">>,\\n {set_view_group,\\n <<126,233,23,3,126,62,146,158,97,21,49,212,152,252,155,124>>,\\n nil,<<\\\"default\\\">>,<<\\\"_design/dev_players\\\">>,<<\\\"javascript\\\">>,[],\\n [{set_view,0,[],[],[],\\n <<\\\"function (doc) {\\\\n if(doc.email) {\\\\n emit(doc._id, doc.city);\\\\n }\\\\n}\\\">>,\\n nil,\\n [{<<\\\"players\\\">>,<<\\\"_count\\\">>}],\\n []}],\\n {[]},\\n nil,nil,nil,nil,nil,nil,undefined,nil,nil}},\\n infinity]}\">>}"}
]}

took 0.724260807037 seconds
{"rows":[
{"key":null,"value":104731}
],
"errors":[
{"from":"http://10.202.101.172:8092/_view_merge/","reason":"req_timedout"}
]}

took 60.014398098 seconds
{"rows":[
{"key":null,"value":133065}
],
"errors":[
{"from":"http://10.202.101.172:8092/_view_merge/","reason":"req_timedout"}
]}