Ruby on Rails, JRuby, AWS, EC2, Exalead - Blog Comments

Comment on 'Video thumbnails with FFmpeg and Paperclip' by Thomas

2010-07-31T08:42:02Z

Although paperclip looked promising at first sight, once we start digging further it quickly reaches its design limits:

it's not well suited for "polymorphic" attachments like attaching a video, audio or video.
background re-encoding is not possible within processors

I'm still keeping it, but I have to bypass the processors and handle the transcoding myself within the model.

Comment on 'InfiniDB, Infobright and MonetDB - Day 3: MonetDB' by businesscardonlinecl

2010-07-31T01:57:20Z

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Comment on 'InfiniDB, Infobright and MonetDB - Day 3: MonetDB' by soyclekly

2010-07-31T01:05:28Z

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Comment on 'Create a bootable EBS AMI from a running instance' by Mateu

2010-07-29T22:04:02Z

When i execute ec2-register -n "AMI from S3" --architecture i386 --block-device-mapping /dev/sda1=snap-788e5c11:15:false this not work, the result is:

SYNOPSIS ec2reg (ec2-register) ec2reg [GENERAL OPTIONS] MANIFEST GENERAL NOTES Any command option/parameter may be passed a value of '-' to indicate that values for that option should be read from stdin. DESCRIPTION Register an AMI manifest for use with EC2. The MANIFEST parameter is the manifest (in S3) to register. e.g. mybucketname/image.manifest

GENERAL OPTIONS

 -K, --private-key KEY
      Specify KEY as the private key to use. Defaults to the value of the
      EC2_PRIVATE_KEY environment variable (if set). Overrides the default.

 -C, --cert CERT
      Specify CERT as the X509 certificate to use. Defaults to the value 
      of the EC2_CERT environment variable (if set). Overrides the default.

 -U, --url URL
      Specify URL as the web service URL to use. Defaults to the value of
      'https://ec2.amazonaws.com' or to that of the EC2_URL environment
      variable (if set). Overrides the default.

 --region REGION
      Specify REGION as the web service region to use.
      This option will override the URL specified by the "-U URL" option and EC2_URL environment variable.

 -v, --verbose
      Verbose output.

 -?, --help
      Display this help.

 -H, --headers
      Display column headers.

 --debug
      Display additional debugging information.

 --show-empty-fields
      Indicate empty fields.

 --connection-timeout TIMEOUT
      Specify a connection timeout TIMEOUT (in seconds).

 --request-timeout TIMEOUT
      Specify a request timeout TIMEOUT (in seconds).

Comment on 'Video thumbnails with FFmpeg and Paperclip' by Thomas Glasgow

2010-07-29T19:59:23Z

Hi Rob it's me again :),

In your comment #14 you talk about an additional processor that converts the video to flv. How would you add that?

Because the way paperclip is made, is that if you upload let's say an mp4 file it's tricky to get .jpg and .flv files.

I didn't manage to tie the processor chooser to a specific style using the lambda. At runtime paperclip wants to inject the processors definition but the lambda doesn't get execute and it fails.

Thanks for your insight.

Comment on 'Video thumbnails with FFmpeg and Paperclip' by Thomas Glasgow

2010-07-29T17:16:48Z

Ok I got it, it's the contenttypeextension interpolation that does the magic. Their documentation on processors is awful!

PS again: what's that stupid comment filtering system you have? I couldn't post a second comment after my previous one. Take it off, it's pain.

Comment on 'Video thumbnails with FFmpeg and Paperclip' by Thomas Glasgow

2010-07-29T16:35:05Z

I am getting closer. So ffmpeg gets fired, the thumbnail is certainly generated, but Paperclip doesn't seem to get it and won't save it along with the original video.

Any reason for that?

PS: By the way I had issues running: Paperclip.run('ffmpeg', cmd), for some reason paperclip surrounds cmd with additional quotes which makes ffmpeg fail.

If I do: cmd = "ffmpeg -i input.avi ..." and Paperclip.run(cmd) ffmpeg can now do its job (but still paperclip won't sve the thumbnail).

Comment on 'Roll your own pagination links with will_paginate' by Diego Plentz

2010-07-29T15:02:49Z

Rob,

I'm using willpaginate 3.0.pre2 with rails 3.0.0.rc, but even if I put the PaginationListLinkRenderer class inside RAILSROOT/lib, then I visit my page that has pagination, I receive the following error:

ActionView::Template::Error (uninitialized constant PaginationListLinkRenderer):

You know anything I can do to try fix this?

Thanks in advance

ps: btw, if I put PaginationListLinkRenderer inside RAILS_ROOT/app/helpers, the error change to: "ActionView::Template::Error (uninitialized constant WillPaginate::LinkRenderer)"

Comment on 'Roll your own pagination links with will_paginate' by nirmal

2010-07-23T08:32:15Z

iam using two different images in pagination i.e. one for pagelinks and another for (previouslabel and nextlabel)

but i could only see image used for pagelinks in the placae of image for(prev and next labels)

so it displays same image for both pagelinks and (prev and next labels).

how can i display two different images i.e. one image for pagelinks and another image for (prev and next labels)

Comment on 'Rails 2.3.8, Rack 1.1 and the curious case of the missing quotes' by Matthias Viehweger

2010-07-22T08:33:14Z

Have you seen this gem?

http://github.com/ingoweiss/gem_patching http://rubygems.org/gems/gem_patching

It only applies the patch to the specified version. This way you don't break your code by updating something.

Regarding the patch itself: nice explanation. Thanks!

Comment on 'Choosing a simple, lightweight WYSIWYG editor' by Rob Anderton

2010-07-16T22:05:47Z

@wout: looks very nice, the UI (especially for headings) is miles better than widgEditor. We've also been using uEditor recently, a port of widgEditor for jQuery which is our current Javascript framework of choice. Now if someone can do a jQuery version of yours I'll be very happy :)

Comment on 'Rails 2.1: now with better integrated caching' by Rob Anderton

2010-07-15T07:52:22Z

I did it the old fashioned way: spotted the commit in the Rails log and then worked through the code line-by-line making notes which I turned into this. There was no documentation at that time, so I was pretty much on my own!

Glad it's still relevant after all this time :)

Was there anything specific you were looking to find out about memcached?
Rob

Comment on 'Rails 2.1: now with better integrated caching' by ionous

2010-07-15T01:56:37Z

even 2 some odd years since you posted this, this is still the simplest and most concise documentation for setting up memcache in rails i was able to find. thanks!

question: do you remember where you originally pulled this info from?

i can't seem to find anything useful regarding memcache in the rails guides or wiki.

Comment on 'InfiniDB, Infobright and MonetDB - Day 2: Infobright' by erin

2010-07-06T20:33:03Z

Infobright does indeed start to shine above 100M rows & esp in the billions. At this number MySQL doesn't handle deletes, updates very well either. AND an ALTER in MySQL can take days.

I found that a highly optimized schema (all ints & decimals no chars/varchars) and queries that are optimized for Infobright meant that queries that took days took seconds & minutes. AND the time a query took to return didn't vary much whether there were 1 billion or 10 billion rows.

In a col based DB it is possible to have queries take hours & days if you run a SELECT * , rather than selecting a few of the columns. Also the number of items returned will affect the time a query takes to return. If I'm returning 6 rows it will be faster than the query returning 55K. The less optimized queries also tend to take a few seconds more each billion record added.

Also a big PLUS for Infobright is the compression. Because our schema is all ints & decimals the compression is pretty amazing. (last I checked it was 6gb Infobright = 414gb Mysql.) Our table is fairly wide for MySQL standards but ok in Infobright. A friend of mine has found that while NULLs can be problematic in MySQL they're great for Infobright....

My only complaint about ICE (Infobright's open source product) is that loading data BLOCKS SELECTS! They've fixed this in the enterprise version but not ICE. I'm a bit unhappy about that.

Comment on 'Goodbye attachment_fu, hello Paperclip' by Casé Oliveira

2010-07-05T21:56:06Z

Thanks for the post!