I'm looking through couch_server and couch_serv_sup, as an example
for study while reading the Armstrong book on OTP.
I've added allow_remote_restart and admin passwords to my couch-
dev.ini so that couch_httpd_msc_handlers calls
couch_server:restart. When it sends the restart to couch_server_sup
I get the stacks below. Debugging it I see that couch_server and the
other children are terminated and couch seems to still behave okay.
Why the exceptions? Is it just the message not being handled? Thanks
and sorry if this is too newbie a question.
Bob
([EMAIL PROTECTED])6> [error] [<0.173.0>] ** Generic server couch_server
terminating
** Last message in was remote_restart
** When Server state == {server,"/Users/bitdiddle/emacs/couchdb/tmp/
lib",
{concat,
{concat,
{concat,bos,{char_class,[{97,122}]}},
{kclosure,
{char_class,
[47,45,43,41,40,36,95,{48,57},
{97,122}]}}},
eos},
"100",4}
** Reason for termination ==
** {badarg,
[{erlang,exit,[couch_server_sup,restart]},
{couch_server,handle_call,
[remote_restart,
{<0.229.0>,#Ref<0.0.0.3189>},
{server,"/Users/bitdiddle/emacs/couchdb/tmp/lib",
{concat,
{concat,
{concat,bos,{char_class,[{97,122}]}},
{kclosure,
{char_class,
[47,45,43,41,40,36,95,{48,57},
{97,122}]}}},
eos},
"100",4}]}]}
([EMAIL PROTECTED])6>
=ERROR REPORT==== 15-Nov-2008::07:53:50 ===
** Generic server couch_server terminating
** Last message in was remote_restart
** When Server state == {server,"/Users/bitdiddle/emacs/couchdb/tmp/
lib",
{concat,
{concat,
{concat,bos,{char_class,[{97,122}]}},
{kclosure,
{char_class,
[47,45,43,41,40,36,95,{48,57},
{97,122}]}}},
eos},
"100",4}
** Reason for termination ==
** {badarg,
[{erlang,exit,[couch_server_sup,restart]},
{couch_server,handle_call,
[remote_restart,
{<0.229.0>,#Ref<0.0.0.3189>},
{server,"/Users/bitdiddle/emacs/couchdb/tmp/lib",
{concat,
{concat,
{concat,bos,{char_class,[{97,122}]}},
{kclosure,
{char_class,
[47,45,43,41,40,36,95,{48,57},
{97,122}]}}},
eos},
"100",4}]}]}
([EMAIL PROTECTED])6> [error] [<0.173.0>] {error_report,<0.28.0>,
{<0.173.0>,crash_report,
[[{pid,<0.173.0>},
{registered_name,couch_server},
{error_info,
{exit,
{badarg,
[{erlang,exit,[couch_server_sup,restart]},
{couch_server,handle_call,
[remote_restart,
{<0.229.0>,#Ref<0.0.0.3189>},
{server,"/Users/bitdiddle/emacs/couchdb/tmp/lib",
{concat,
{concat,
{concat,bos,{char_class,[{97,122}]}},
{kclosure,{char_class,[47,45,43,41,40,36,95,{48,57},
{97,122}]}}},
eos},
"100",4}]}]},
[{gen_server,terminate,6},{proc_lib,init_p_do_apply,3}]}},
{initial_call,{couch_server,init,['Argument__1']}},
{ancestors,[<0.55.0>,couch_server_sup,<0.1.0>]},
{messages,[]},
{links,[<0.196.0>,<0.200.0>,<0.206.0>,<0.188.0>,<0.55.0>]},
{dictionary,[]},
{trap_exit,true},
{status,running},
{heap_size,2584},
{stack_size,23},
{reductions,25027}],
[{neighbour,
[{pid,<0.198.0>},
{registered_name,[]},
{initial_call,{couch_stream,init,['Argument__1']}},
{current_function,{gen_server,loop,6}},
{ancestors,
[<0.197.0>,<0.196.0>,couch_server,<0.55.0>,couch_server_sup,<0.1.0>]},
{messages,[]},
{links,[<0.197.0>]},
{dictionary,[]},
{trap_exit,false},
{status,waiting},
{heap_size,233},
{stack_size,9},
{reductions,42}]},
{neighbour,
[{pid,<0.197.0>},
{registered_name,[]},
{initial_call,{couch_db_updater,init,['Argument__1']}},
{current_function,{gen_server,loop,6}},
{ancestors,
[<0.196.0>,couch_server,<0.55.0>,couch_server_sup,<0.1.0>]},
{messages,[]},
{links,[<0.196.0>,<0.198.0>,<0.195.0>]},
{dictionary,[]},
{trap_exit,false},
{status,waiting},
{heap_size,1597},
{stack_size,9},
{reductions,80382}]},
{neighbour,
[{pid,<0.199.0>},
{registered_name,[]},
{initial_call,{couch_file,init,['Argument__1']}},
{current_function,{gen_server,loop,6}},
{ancestors,[couch_server,<0.55.0>,couch_server_sup,<0.1.0>]},
{messages,[]},
{links,[#Port<0.3317>,<0.201.0>]},
{dictionary,[{<0.200.0>,{#Ref<0.0.0.1980>,1}}]},
{trap_exit,false},
{status,waiting},
{heap_size,233},
{stack_size,9},
{reductions,1100}]},
{neighbour,
[{pid,<0.202.0>},
{registered_name,[]},
{initial_call,{couch_stream,init,['Argument__1']}},
{current_function,{gen_server,loop,6}},
{ancestors,
[<0.201.0>,<0.200.0>,couch_server,<0.55.0>,couch_server_sup,<0.1.0>]},
{messages,[]},
{links,[<0.201.0>]},
{dictionary,[]},
{trap_exit,false},
{status,waiting},
{heap_size,233},
{stack_size,9},
{reductions,42}]},
{neighbour,
[{pid,<0.201.0>},
{registered_name,[]},
{initial_call,{couch_db_updater,init,['Argument__1']}},
{current_function,{gen_server,loop,6}},
{ancestors,
[<0.200.0>,couch_server,<0.55.0>,couch_server_sup,<0.1.0>]},
{messages,[]},
{links,[<0.200.0>,<0.202.0>,<0.199.0>]},
{dictionary,[]},
{trap_exit,false},
{status,waiting},
{heap_size,1597},
{stack_size,9},
{reductions,80382}]},
{neighbour,
[{pid,<0.205.0>},
{registered_name,[]},
{initial_call,{couch_file,init,['Argument__1']}},
{current_function,{gen_server,loop,6}},
{ancestors,[couch_server,<0.55.0>,couch_server_sup,<0.1.0>]},
{messages,[]},
{links,[#Port<0.3326>,<0.207.0>]},
{dictionary,[{<0.206.0>,{#Ref<0.0.0.2233>,1}}]},
{trap_exit,false},
{status,waiting},
{heap_size,2584},
{stack_size,9},
{reductions,23700}]},
{neighbour,
[{pid,<0.208.0>},
{registered_name,[]},
{initial_call,{couch_stream,init,['Argument__1']}},
{current_function,{gen_server,loop,6}},
{ancestors,
[<0.207.0>,<0.206.0>,couch_server,<0.55.0>,couch_server_sup,<0.1.0>]},
{messages,[]},
{links,[<0.207.0>]},
{dictionary,[]},
{trap_exit,false},
{status,waiting},
{heap_size,610},
{stack_size,9},
{reductions,394}]},
{neighbour,
[{pid,<0.207.0>},
{registered_name,[]},
{initial_call,{couch_db_updater,init,['Argument__1']}},
{current_function,{gen_server,loop,6}},
{ancestors,
[<0.206.0>,couch_server,<0.55.0>,couch_server_sup,<0.1.0>]},
{messages,[]},
{links,[<0.206.0>,<0.208.0>,<0.205.0>]},
{dictionary,[]},
{trap_exit,false},
{status,waiting},
{heap_size,2584},
{stack_size,9},
{reductions,364483}]},
{neighbour,
[{pid,<0.187.0>},
{registered_name,[]},
{initial_call,{couch_file,init,['Argument__1']}},
{current_function,{gen_server,loop,6}},
{ancestors,[couch_server,<0.55.0>,couch_server_sup,<0.1.0>]},
{messages,[]},
{links,[#Port<0.3311>,<0.189.0>]},
{dictionary,[{<0.188.0>,{#Ref<0.0.0.1911>,1}}]},
{trap_exit,false},
{status,waiting},
{heap_size,377},
{stack_size,9},
{reductions,1179}]},
{neighbour,
[{pid,<0.190.0>},
{registered_name,[]},
{initial_call,{couch_stream,init,['Argument__1']}},
{current_function,{gen_server,loop,6}},
{ancestors,
[<0.189.0>,<0.188.0>,couch_server,<0.55.0>,couch_server_sup,<0.1.0>]},
{messages,[]},
{links,[<0.189.0>]},
{dictionary,[]},
{trap_exit,false},
{status,waiting},
{heap_size,233},
{stack_size,9},
{reductions,42}]},
{neighbour,
[{pid,<0.189.0>},
{registered_name,[]},
{initial_call,{couch_db_updater,init,['Argument__1']}},
{current_function,{gen_server,loop,6}},
{ancestors,
[<0.188.0>,couch_server,<0.55.0>,couch_server_sup,<0.1.0>]},
{messages,[]},
{links,[<0.188.0>,<0.190.0>,<0.187.0>]},
{dictionary,[]},
{trap_exit,false},
{status,waiting},
{heap_size,610},
{stack_size,9},
{reductions,80193}]},
{neighbour,
[{pid,<0.188.0>},
{registered_name,[]},
{initial_call,{couch_db,init,['Argument__1']}},
{current_function,{gen_server,loop,6}},
{ancestors,[couch_server,<0.55.0>,couch_server_sup,<0.1.0>]},
{messages,[]},
{links,[<0.173.0>,<0.189.0>]},
{dictionary,[]},
{trap_exit,false},
{status,waiting},
{heap_size,610},
{stack_size,9},
{reductions,197}]},
{neighbour,
[{pid,<0.206.0>},
{registered_name,[]},
{initial_call,{couch_db,init,['Argument__1']}},
{current_function,{gen_server,loop,6}},
{ancestors,[couch_server,<0.55.0>,couch_server_sup,<0.1.0>]},
{messages,[]},
{links,[<0.173.0>,<0.207.0>]},
{dictionary,[]},
{trap_exit,false},
{status,waiting},
{heap_size,2584},
{stack_size,9},
{reductions,1024}]},
{neighbour,
[{pid,<0.200.0>},
{registered_name,[]},
{initial_call,{couch_db,init,['Argument__1']}},
{current_function,{gen_server,loop,6}},
{ancestors,[couch_server,<0.55.0>,couch_server_sup,<0.1.0>]},
{messages,[]},
{links,[<0.173.0>,<0.201.0>]},
{dictionary,[]},
{trap_exit,false},
{status,waiting},
{heap_size,377},
{stack_size,9},
{reductions,147}]},
{neighbour,
[{pid,<0.196.0>},
{registered_name,[]},
{initial_call,{couch_db,init,['Argument__1']}},
{current_function,{gen_server,loop,6}},
{ancestors,[couch_server,<0.55.0>,couch_server_sup,<0.1.0>]},
{messages,[]},
{links,[<0.173.0>,<0.197.0>]},
{dictionary,[]},
{trap_exit,false},
{status,waiting},
{heap_size,377},
{stack_size,9},
{reductions,155}]}]]}}
([EMAIL PROTECTED])6> [error] [<0.55.0>] {error_report,<0.28.0>,
{<0.55.0>,supervisor_report,
[{supervisor,{<0.55.0>,couch_server_sup}},
{errorContext,child_terminated},
{reason,
{badarg,
[{erlang,exit,[couch_server_sup,restart]},
{couch_server,handle_call,
[remote_restart,
{<0.229.0>,#Ref<0.0.0.3189>},
{server,"/Users/bitdiddle/emacs/couchdb/tmp/lib",
{concat,
{concat,
{concat,bos,{char_class,[{97,122}]}},
{kclosure,{char_class,[47,45,43,41,40,36,95,{48,57},
{97,122}]}}},
eos},
"100",4}]}]}},
{offender,
[{pid,<0.173.0>},
{name,couch_server},
{mfa,{couch_server,sup_start_link,[]}},
{restart_type,permanent},
{shutdown,brutal_kill},
{child_type,supervisor}]}]}}
