Don't rescue Exception, rescue StandardError

Before

Explicitly rescuing Exception will rescue even not normally recoverable errors such as SyntaxError, LoadError, and Interrupt.

begin
  foo
rescue Exception => e
  logger.warn "Unable to foo, will ignore: #{e}"
end

Refactor

If you omit the Exception type qualifier, then Ruby will catch only StandardError, which is probably what you want:

begin
  foo
rescue => e
  logger.warn "Unable to foo, will ignore: #{e}"
end

See also http://stackoverflow.com/questions/10048173/why-is-it-bad-style-to-rescue-exception-e-in-ruby