我现在在两个应用程序上遇到了这个问题。Heroku 自己(还)无法提供太多帮助。
我在用:
使用我的本地 Postgres 和 Redis 数据库运行时,一切都很好。
这是我的 Heroku 日志中的错误示例:
2013-01-01T21:17:27+00:00 app[resque_worker.1]: Found job on #<Resque::Queue:0x00000006652920>
2013-01-01T21:17:27+00:00 app[resque_worker.1]: got: (Job{facebook} | FacebookRefresh | ["facebook_key"])
2013-01-01T21:17:27+00:00 app[resque_worker.1]: Running before_fork hooks with [(Job{facebook} | FacebookRefresh | ["facebook_key"])]
2013-01-01T21:17:27+00:00 app[resque_worker.1]: Running after_fork hooks with [(Job{facebook} | FacebookRefresh | ["facebook_key"])]
2013-01-01T21:17:27+00:00 app[resque_worker.1]: resque-2.0.0.pre.1: Processing facebook since 1357075047
2013-01-01T21:17:27+00:00 app[resque_worker.1]: resque-2.0.0.pre.1: Forked 503 at 1357075047
2013-01-01T21:17:27+00:00 app[resque_worker.1]: Running before_perform hooks with [(Job{facebook} | FacebookRefresh | ["facebook_key"])]
2013-01-01T21:17:27+00:00 app[resque_worker.1]: : SELECT a.attname, format_type(a.atttypid, a.atttypmod),
2013-01-01T21:17:27+00:00 app[resque_worker.1]: FROM pg_attribute a LEFT JOIN pg_attrdef d
2013-01-01T21:17:27+00:00 app[resque_worker.1]: ON a.attrelid = d.adrelid AND a.attnum = d.adnum
2013-01-01T21:17:27+00:00 app[resque_worker.1]: pg_get_expr(d.adbin, d.adrelid), a.attnotnull, a.atttypid, a.atttypmod
2013-01-01T21:17:27+00:00 app[resque_worker.1]: ). Retrying...
2013-01-01T21:17:27+00:00 app[resque_worker.1]: Performing FacebookRefresh caused an exception (PG::Error: SSL SYSCALL error: EOF detected
2013-01-01T21:17:27+00:00 app[resque_worker.1]: WHERE a.attrelid = '"facebook_accounts"'::regclass
2013-01-01T21:17:27+00:00 app[resque_worker.1]: ORDER BY a.attnum
2013-01-01T21:17:27
+00:00 app[resque_worker.1]: AND a.attnum > 0 AND NOT a.attisdropped
2013-01-01T21:17:27+00:00 app[resque_worker.1]: : SELECT a.attname, format_type(a.atttypid, a.atttypmod),
2013-01-01T21:17:27+00:00 app[resque_worker.1]: FROM pg_attribute a LEFT JOIN pg_attrdef d
2013-01-01T21:17:27+00:00 app[resque_worker.1]: ON a.attrelid = d.adrelid AND a.attnum = d.adnum
2013-01-01T21:17:27+00:00 app[resque_worker.1]: (Job{facebook} | FacebookRefresh | ["facebook_key"]) failed: #<ActiveRecord::StatementInvalid: PG::Error: SSL SYSCALL error: EOF detected
2013-01-01T21:17:27+00:00 app[resque_worker.1]: >
2013-01-01T21:17:27+00:00 app[resque_worker.1]: pg_get_expr(d.adbin, d.adrelid), a.attnotnull, a.atttypid, a.atttypmod
2013-01-01T21:17:27+00:00 app[resque_worker.1]: AND a.attnum > 0 AND NOT a.attisdropped
2013-01-01T21:17:27+00:00 app[resque_worker.1]: WHERE a.attrelid = '"facebook_accounts"'::regclass
2013-01-01T21:17:27+00:00 app[resque_worker.1]: ORDER BY a.attnum
2013-01-01T21:17:27+00:00 app[resque_worker.1]: Running before_fork hooks with [(Job{facebook} | FacebookRefresh | ["facebook_key"])]
我在我的独角兽的配置文件中尝试了很多 before_hook 和 after_hook 的东西,但它们似乎都没有帮助。
# What the timeout for killing busy workers is, in seconds
timeout 60
# Whether the app should be pre-loaded
preload_app true
# How many worker processes
worker_processes 3
before_fork do |server, worker|
# Replace with MongoDB or whatever
if defined?(ActiveRecord::Base)
ActiveRecord::Base.connection.disconnect!
Rails.logger.info('Disconnected from ActiveRecord')
end
# If you are using Redis but not Resque, change this
if defined?(Resque)
Resque.redis.quit
Rails.logger.info('Disconnected from Redis')
end
sleep 1
end
after_fork do |server, worker|
if defined?(ActiveRecord::Base)
ActiveRecord::Base.establish_connection
Rails.logger.info('Connected to ActiveRecord')
end
if defined?(Resque)
Resque.redis = ENV['OPENREDIS_URL'] || 'redis://localhost:6379'
Rails.logger.info('Connected to Redis')
end
end
还有我的 Procfile
web: bundle exec unicorn -c lib/unicorn/config.rb -p $PORT
resque_scheduler: env bundle exec rake resque:scheduler
resque_worker: env QUEUE=* bundle exec rake environment resque:work
所以我想知道的一件事是我的 resque_worker 根本不使用 Unicorn 配置,并且由于它运行在一个完全独立的 Heroku worker 上,我不确定它是否有任何方法可以知道这些东西。Web 实例和调度程序都很好。它只是 resque_worker 在每次 postgres 调用时都会爆炸。
我没有从工作人员那里进行任何特别疯狂的数据库调用。一个例子可能是:
def queue_users_for_refresh
FacebookAccount.all.each do |x|
Resque.enqueue(FacebookAccountRefresh, x.username)
end
end
另一个稍后(在 FacebookAccountRefresh 中)是:
FacebookAccount.where(:username => user).first