Rails - Jan 2012 - Flushing a log file

Hi all,

Since moving to Rails 3.2.1, I haven''t been able to figure out how to
flush the log file in production. I found this release note
(https://gist.github.com/1472145), which I don''t understand:

-------------------------
ActiveSupport::BufferedLogger#auto_flushing is deprecated. Either set
the sync level on the underlying file handle like this:

f = File.open(''foo.log'', ''w'')
f.sync = true
ActiveSupport::BufferedLogger.new f

Or tune your filesystem. The FS cache is now what controls flushing.
-------------------------

First, it seems to me that the above code would erase my existing
production.log file. I definitely don''t want that.

Second, where and when would I run this? Is this something that would
be put in an initializer some place?

And, perhaps I don''t understand the underlying system, but
shouldn''t I
be setting config.logger to the return value of that, so the third
line would be:

config.logger = ActiveSupport::BufferedLogger.new f

-------------------------
What I''m really trying to do is have a way to get the production log
to show the latest information. At the moment, it takes a long time to
write. In development mode it works just fine.

(I''m on CentOS 5.5, Ruby 1.9.3, Rails 3.2.1)

Thanks!
Paul

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It will overwrite your file.  Perhaps "a" rather than "w"
would append.

I also don''t think it''s a tunable filesystem issue...

--Michael

On Jan 31, 2012, at 4:58 PM, Paul wrote:
> Hi all,
> 
> Since moving to Rails 3.2.1, I haven''t been able to figure out how
to
> flush the log file in production. I found this release note
> (https://gist.github.com/1472145), which I don''t understand:
> 
> -------------------------
> ActiveSupport::BufferedLogger#auto_flushing is deprecated. Either set
> the sync level on the underlying file handle like this:
> 
> f = File.open(''foo.log'', ''w'')
> f.sync = true
> ActiveSupport::BufferedLogger.new f
> 
> Or tune your filesystem. The FS cache is now what controls flushing.
> -------------------------
> 
> First, it seems to me that the above code would erase my existing
> production.log file. I definitely don''t want that.
> 
> Second, where and when would I run this? Is this something that would
> be put in an initializer some place?
> 
> And, perhaps I don''t understand the underlying system, but
shouldn''t I
> be setting config.logger to the return value of that, so the third
> line would be:
> 
> config.logger = ActiveSupport::BufferedLogger.new f
> 
> -------------------------
> What I''m really trying to do is have a way to get the production
log
> to show the latest information. At the moment, it takes a long time to
> write. In development mode it works just fine.
> 
> (I''m on CentOS 5.5, Ruby 1.9.3, Rails 3.2.1)
> 
> Thanks!
> Paul
> 
> -- 
> You received this message because you are subscribed to the Google Groups
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> To post to this group, send email to
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> To unsubscribe from this group, send email to
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> 
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