And by the way. In the second case views are non-functional on this node anymore. Index folder always hangs on some couch_set_view_group call:
Program counter: 0x00007fc3212c6e08 (gen:do_call/4 + 576)
CP: 0x0000000000000000 (invalid)
arity = 0
0x00007fc2cd3e3288 Return addr 0x00007fc32136d9a8 (gen_server:call/3 + 128)
y(0) #Ref<0.0.5.155655>
y(1) '
n_4@10.17.2.9'
y(2) []
y(3) infinity
y(4) {get_group_server,<<7 bytes>>,{set_view_group,<<16 bytes>>,nil,<<7 bytes>>,<<12 bytes>>,<<10 bytes>>,[],[{set_view,0,[],[],[],<<41 bytes>>,nil,[{<<6 bytes>>,<<6 bytes>>}],[]}],{[]},nil,nil,nil,nil,nil,nil,undefined,nil,nil}}
y(5) '$gen_call'
y(6) <0.195.0>
0x00007fc2cd3e32c8 Return addr 0x00007fc31de4d118 (couch_set_view:get_group_server/2 + 128)
y(0) infinity
y(1) {get_group_server,<<7 bytes>>,{set_view_group,<<16 bytes>>,nil,<<7 bytes>>,<<12 bytes>>,<<10 bytes>>,[],[{set_view,0,[],[],[],<<41 bytes>>,nil,[{<<6 bytes>>,<<6 bytes>>}],[]}],{[]},nil,nil,nil,nil,nil,nil,undefined,nil,nil}}
y(2) couch_set_view
y(3) Catch 0x00007fc32136d9a8 (gen_server:call/3 + 128)
0x00007fc2cd3e32f0 Return addr 0x00007fc31de4cb28 (couch_set_view:get_group/3 + 56)
0x00007fc2cd3e32f8 Return addr 0x00007fc31de4f390 (couch_set_view:get_reduce_view/5 + 88)
y(0) ok
0x00007fc2cd3e3308 Return addr 0x00007fc2cc7731a8 (couch_view_merger:get_set_view/6 + 208)
y(0) [99,100,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,125,126,128,129,148,149,166,167,168,175,177,178,191,192,193,200,201,218,219,243,244,255]
y(1) <<6 bytes>>
0x00007fc2cd3e3320 Return addr 0x00007fc2cc773490 (couch_view_merger:prepare_set_view/4 + 352)
y(0) [99,100,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,125,126,128,129,148,149,166,167,168,175,177,178,191,192,193,200,201,218,219,243,244,255]
y(1) update_after
y(2) <<6 bytes>>
y(3) <<12 bytes>>
y(4) <<7 bytes>>
y(5) #Fun<couch_set_view.get_reduce_view.5>
0x00007fc2cd3e3358 Return addr 0x00007fc2cc7774c0 (couch_view_merger:reduce_set_view_folder/4 + 720)
y(0) []
y(1) []
y(2) <0.31777.0>
y(3) <<12 bytes>>
y(4) <<7 bytes>>
y(5) Catch 0x00007fc2cc773750 (couch_view_merger:prepare_set_view/4 + 1056)
0x00007fc2cd3e3390 Return addr 0x00000000008a4cc8 (<terminate process normally>)
y(0) []
y(1) []
y(2) []
y(3) []
y(4) []
y(5) <<14 bytes>>
y(6) <0.31777.0>
y(7) {doc,<<12 bytes>>,{1,<<4 bytes>>},{[{<<5 bytes>>,{[{<<6 bytes>>,{[{<<3 bytes>>,<<41 bytes>>},{<<6 bytes>>,<<6 bytes>>}]}}]}}]},nil,false,[]}
y(8) {index_merge,[{set_view_spec,<<7 bytes>>,<<12 bytes>>,<<6 bytes>>,[99,100,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,125,126,128,129,148,149,166,167,168,175,177,178,191,192,193,200,201,218,219,243,244,255],nil,nil}],#Fun<couch_httpd_view_merger.0.27295029>,{sender_acc,{httpd,{mochiweb_request,#Port<0.29092>,'POST',"/_view_merge/",{1,1},{4,{"accept",{'Accept',"application/json"},nil,{"content-type",{'Content-Type',"application/json"},{"content-length",{'Content-Length',"272"},nil,nil},{"host",{'Host',"10.17.2.9:9504"},nil,nil}}}}},"10.17.2.9",'POST',[<<11 bytes>>],[<<11 bytes>>],capi_frontend,{dict,8,16,16,8,80,48,{[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[]},{{[[<<7 bytes>>|#Fun<couch_httpd.8.26678597>]],[[<<9 bytes>>|#Fun<couch_httpd.8.26678597>]],[[<<13 bytes>>|#Fun<couch_httpd.8.26678597>]],[],[],[[<<7 bytes>>|#Fun<couch_httpd.8.26678597>]],[[<<16 bytes>>|#Fun<couch_httpd.8.26678597>]],[],[[<<8 bytes>>|#Fun<couch_httpd.8.26678597>]],[],[],[[<<10 bytes>>|#Fun<couch_httpd.8.26678597>]],[[<<8 bytes>>|#Fun<couch_httpd.8.26678597>]],[],[],[]}}},{user_ctx,null,[<<6 bytes>>],<<50 bytes>>},undefined,{dict,11,16,16,8,80,48,{[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[]},{{[],[[<<8 bytes>>|#Fun<couch_httpd.10.12509357>],[<<5 bytes>>|#Fun<couch_httpd.10.12509357>]],[[<<5 bytes>>|#Fun<couch_httpd.10.12509357>],[<<5 bytes>>|#Fun<couch_httpd.10.12509357>]],[[<<7 bytes>>|#Fun<couch_httpd.10.12509357>]],[],[[<<14 bytes>>|#Fun<couch_httpd.10.12509357>],[<<14 bytes>>|#Fun<couch_httpd.10.12509357>]],[],[],[],[[<<8 bytes>>|#Fun<couch_httpd.10.12509357>]],[],[],[],[[<<5 bytes>>|#Fun<couch_httpd.10.12509357>]],[],[[<<17 bytes>>|#Fun<couch_httpd.10.12509357>],[<<12 bytes>>|#Fun<couch_httpd.10.12509357>]]}}},undefined,#Fun<couch_httpd.6.96738937>,{dict,18,16,16,8,80,48,{[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[]},{{[[<<8 bytes>>|#Fun<couch_httpd.6.96738937>],[<<10 bytes>>|#Fun<couch_httpd.6.96738937>]],[[<<13 bytes>>|#Fun<couch_httpd.6.96738937>]],[],[[<<14 bytes>>|#Fun<couch_httpd.6.96738937>]],[[<<6 bytes>>|#Fun<couch_httpd.5.32618959>],[<<1 byte>>|#Fun<couch_httpd.5.32618959>],[<<7 bytes>>|#Fun<couch_httpd.6.96738937>]],[[<<4 bytes>>|#Fun<couch_httpd.6.96738937>]],[[<<9 bytes>>|#Fun<couch_httpd.6.96738937>]],[],[[<<8 bytes>>|#Fun<couch_httpd.6.96738937>],[<<14 bytes>>|#Fun<couch_httpd.6.96738937>],[<<14 bytes>>|#Fun<couch_httpd.6.96738937>]],[],[[<<6 bytes>>|#Fun<couch_httpd.6.96738937>],[<<11 bytes>>|#Fun<couch_httpd.5.32618959>]],[[<<8 bytes>>|#Fun<couch_httpd.6.96738937>],[<<6 bytes>>|#Fun<couch_httpd.6.96738937>]],[[<<11 bytes>>|#Fun<couch_httpd.6.96738937>]],[],[[<<6 bytes>>|#Fun<couch_httpd.6.96738937>]],[]}}}},nil,continue,<<0 bytes>>,[]},60000,continue,{1,<<4 bytes>>},{view_query_args,undefined,undefined,<<0 bytes>>,<<1 byte>>,fwd,true,10000000000,0,0,reduce,false,false,update_after,false,nil,nil,true,nil,<<6 bytes>>},{user_ctx,null,[<<6 bytes>>],<<50 bytes>>},{view_merge,nil,nil,<<10 bytes>>,nil}}
y(9) {view_query_args,undefined,undefined,<<0 bytes>>,<<1 byte>>,fwd,true,10000000000,0,0,reduce,false,false,update_after,false,nil,nil,true,nil,<<6 bytes>>}
y(10) <<12 bytes>>
y(11) <<7 bytes>>
Bug
Resolved
Blocker
There's a TODO in the view group regarding this that could be the cause.
I just uploaded a change to gerrit to do the todo:
http://review.couchbase.org/#change,12638
This can be a race condition, hard to reproduce.