Hi everyone,
I have been trying to solve this problem for quite some time now and I
really don’t have any further clue to investigate.
I am running a mongrel_cluster 1.0.5-2 (mongrel verison : 1.1.5-5) on
a ubuntu box with apache2 2.2.12-1ubuntu2.1
I have 4 different apps on the same box and each app has two mongrel
instances.
After a short period of time ( < 2 hours ) some of the 8 mongrel
instances just stop responding.
I read the mongrel FAQ and tried to set
ActiveRecord::Base.verification_timeout = 14400 (the mysql parameter
is set to the default 28800) in myapp/config/environments/
production.rb
The problem kept happening.
I decided to lower that number, making it 60.
No more success.
I installed gdb and the ruby macros to make sure i was in the mysql
driver while hanging and sure enough, here is the top of the BT from
GDB :
/var/lib/gems/1.8/gems/activerecord-2.2.2/lib/active_record/
connection_adapters/mysql_adapter.rb:264:in active?'", "/var/lib/gems/1.8/gems/activerecord-2.2.2/lib/active_record/ connection_adapters/abstract_adapter.rb:136:inverify!’",
“/var/lib/gems/1.8/gems/activerecord-2.2.2/lib/active_record/
connection_adapters/abstract/connection_pool.rb:256:in
checkout_and_verify'", "/var/lib/gems/1.8/gems/activerecord-2.2.2/lib/active_record/ connection_adapters/abstract/connection_pool.rb:252:incheckout_existing_connection’”,
“/var/lib/gems/1.8/gems/activerecord-2.2.2/lib/active_record/
connection_adapters/abstract/connection_pool.rb:186:in checkout'", "/var/lib/gems/1.8/gems/activerecord-2.2.2/lib/active_record/ connection_adapters/abstract/connection_pool.rb:184:inloop’”,
“/var/lib/gems/1.8/gems/activerecord-2.2.2/lib/active_record/
connection_adapters/abstract/connection_pool.rb:184:in checkout'", "/usr/lib/ruby/1.8/monitor.rb:242:insynchronize’”,
“/var/lib/gems/1.8/gems/activerecord-2.2.2/lib/active_record/
connection_adapters/abstract/connection_pool.rb:183:in checkout'", "/var/lib/gems/1.8/gems/activerecord-2.2.2/lib/active_record/ connection_adapters/abstract/connection_pool.rb:98:inconnection’”,
“/var/lib/gems/1.8/gems/activerecord-2.2.2/lib/active_record/
connection_adapters/abstract/connection_pool.rb:326:in
retrieve_connection'", "/var/lib/gems/1.8/gems/activerecord-2.2.2/lib/active_record/ connection_adapters/abstract/connection_specification.rb:121:inretrieve_connection’”,
“/var/lib/gems/1.8/gems/activerecord-2.2.2/lib/active_record/
connection_adapters/abstract/connection_specification.rb:113:in
connection'", "/var/lib/gems/1.8/gems/activerecord-2.2.2/lib/active_record/base.rb: 2934:inquoted_table_name’”,
“/var/lib/gems/1.8/gems/activerecord-2.2.2/lib/active_record/base.rb:
1626:in construct_finder_sql'", "/var/lib/gems/1.8/gems/activerecord-2.2.2/lib/active_record/base.rb: 1490:infind_every’”,
“/var/lib/gems/1.8/gems/activerecord-2.2.2/lib/active_record/base.rb:
589:in `find’”,
I figured that since I was running a packaged version of
mongrel_cluster (not the gem installed one), I should use the package
version of mysql driver for ruby.
So i did
gem uninstall mysql
and installed :
apt-get install libmysql-ruby1.8
I then restarted the mongrels and sure enough after 1h25 one of them
was hanging in the mysql_adapter.rb, showing the same backtrace as
before.
I really am out of clue here and any advice / help would be much
appreciated.
I have to note that I am far from being an ROR guru and maybe the
solution to my problem is simpler than what I have been looking for,
but I just don’t know where to look anymore.
Thanks for any advice / answer
Damien
