CODEWITHSUNDEEP
ruby-on-railsrubymongodb
Reed G. Law
Reed G. Law

Reputation: 3945

Mongodb server goes down, how to prevent Rails app from timing out?

I'm using central_logger to store logs from our Rails app in mongodb. When the mongo server went down recently our app started timing out on mongo inserts. How can I prevent Rails from timing out if the mongo server goes down?

Upvotes: 1

Views: 564

Answers (3)

Jesse Wolgamott
Jesse Wolgamott

Reputation: 40277

The ruby driver supports timeouts like so

@conn = Connection.new("localhost", 27017, :pool_size => 5, :timeout => 5)

But the central_logger gem isn't using that. So you can either fork it to add that in there, or monkey-path the CentralLogger::MongoLogger.connect method

It currently has

def connect
    @mongo_connection ||= Mongo::Connection.new(@db_configuration['host'],
                                                @db_configuration['port'],
                                                :auto_reconnect => true).db(@db_configuration['database'])

    if @db_configuration['username'] && @db_configuration['password']
      # the driver stores credentials in case reconnection is required
      @authenticated = @mongo_connection.authenticate(@db_configuration['username'],
                                                      @db_configuration['password'])
    end
  end

You would need to monkey-path in :timeout=>5 (or whatever) to the Mongo::Connection.new

I would bet the author of central-logger would like to have this in there, so a fork and pull request would likely be welcome.

Upvotes: 1

moritz
moritz

Reputation: 25767

Usually the database insert should be fast, so you could work with the ruby timeout:

require 'timeout'
Timeout::timeout(0.2) do
  ... write to log server
end

this code will timeout and continue after 200 milliseconds in any case.

Upvotes: 0

AdaTheDev
AdaTheDev

Reputation: 147324

You could use replica sets - so if the master goes down, it can failover automatically to one of the replicas.

Upvotes: 0

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