periodic downtime

[jywarren]

Having resolved the nearby_maps issue, we continue to chase downtime...

[jywarren]

Dogi posted this logfile of really long page renders: https://gist.github.com/jywarren/a92c2b2737f2fe797a2d

I think the map/images/foo ones are a red herring, as there doesn't seem to be a way they could possibly generate 600 second long queries... but they do regularly show up just after the "too many connections" lines.

[jywarren]

And we see that normally the /map/images/foo calls don't tax the db at all:

Completed in 235ms (View: 1, DB: 233) | 200 OK [http://mapknitter.org/map/images/mariel] Completed in 490ms (View: 1, DB: 487) | 200 OK [http://mapknitter.org/map/images/marlie] Completed in 612ms (View: 1, DB: 610) | 200 OK [http://mapknitter.org/map/images/melly] Completed in 204ms (View: 1, DB: 202) | 200 OK [http://mapknitter.org/map/images/mia] Completed in 217ms (View: 0, DB: 215) | 200 OK [http://mapknitter.org/map/images/millie] Completed in 574ms (View: 0, DB: 572) | 200 OK [http://mapknitter.org/map/images/mk-demo] Completed in 4240ms (View: 0, DB: 4238) | 200 OK [http://mapknitter.org/map/images/mode] Completed in 8227ms (View: 0, DB: 8225) | 200 OK [http://mapknitter.org/map/images/mugisha] Completed in 401765ms (View: 1, DB: 401762) | 200 OK [http://mapknitter.org/map/images/nadezhda] Completed in 591989ms (View: 4, DB: 591981) | 200 OK [http://mapknitter.org/map/images/pavla] Completed in 608675ms (View: 1, DB: 608673) | 200 OK [http://mapknitter.org/map/images/rayya] Completed in 975210ms (View: 1, DB: 975208) | 200 OK [http://mapknitter.org/map/images/kaycee] Completed in 74334ms (View: 0, DB: 74332) | 200 OK [http://mapknitter.org/map/images/debra] Completed in 1304ms (View: 1, DB: 1299) | 200 OK [http://mapknitter.org/map/images/marden] Completed in 1749ms (View: 0, DB: 1748) | 200 OK [http://mapknitter.org/map/images/rosie] Completed in 602ms (View: 0, DB: 601) | 200 OK [http://mapknitter.org/map/images/chantry-flats-trail-map] Completed in 699ms (View: 2, DB: 725) | 200 OK [http://mapknitter.org/map/images/oasis-middle-dirt] Completed in 905ms (View: 1, DB: 901) | 200 OK [http://mapknitter.org/map/images/grovetown]

[jywarren]

OK, i found this article about "Too many connections": http://stackoverflow.com/questions/14163378/rails-mysql-too-many-connections

which suggests letting mysql connections die after 5 minutes if unused, with this change to database.yml:

production: adapter: mysql
database: **** username: **** password: **** wait_timeout: 300

[treehouse-su]

nice link

[jywarren]

Believe this resolved;