"decoder jpeg not available" with Pillow on AWS Elastic Beanstalk

Question

i'm having some trouble to handle jpeg files on Python under AWS Elastic Beanstalk.

I have this on .ebextensions/python.config file:

packages:
 yum:
  libjpeg-turbo-devel: []
  libpng-devel: []
  freetype-devel: []
...

So i believe i have libjpeg installed and working (i tried libjpeg-devel, but yum can't find this package).

Also, i have this on my requirements.txt:

Pillow==2.5.1
...

So i believe i have Pillow installed and working on my environment.

Then, since i have Pillow and libjpeg, i'm trying to do some work using PIL.Image in a Python script and save to a file. Like this:

from PIL import Image

def resize_image(image,new_size,crop=False,correctOrientationSize=False):
  assert type(new_size) == dict
  assert new_size.has_key('width') and new_size.has_key('height')

  THUM_SIZE = [new_size['width'],new_size['height']]

  file_like = cStringIO.StringIO(base64.decodestring(image))
  thumbnail = Image.open(file_like)

  (width,height) = thumbnail.size
  if correctOrientationSize and height > width:
    THUM_SIZE.reverse()

  thumbnail.thumbnail(THUM_SIZE)

  if crop:
    # Recorta imagem
    thumbnail = crop_image(thumbnail)
  output = cStringIO.StringIO()
  thumbnail.save(output,format='jpeg')

return output.getvalue().encode('base64')

However, when i try to run it on Elastic Beanstalk's instance, the exception "decoder jpeg not available" when it calls .save() method.

If i SSH into my instance, it works just fine and i already tried to rebuild the environment.

What am i doing wrong?

UPDATE:

As suggested, i SSHed again into the instance and reinstalled Pillow through pip (/opt/python/run/venv/bin/pip), not before i has had sure libjpeg-devel was on environment before Pillow.

I ran selftest.py and it confirmed that i had support for jpeg. So, in a last try, i went to "Restart App Server" on Elastic Beanstalk interface. It worked.

Thank you all.

Answer 1

Following the general advice from here, I solved this by adding the following in my .ebextensions configuration and re-deploying.

packages:
  yum:
    libjpeg-turbo-devel: []
    libpng-devel: []
    freetype-devel: []

container_commands:
...
  05_uninstall_pil:
    command: "source /opt/python/run/venv/bin/activate && yes | pip uninstall Pillow"

  06_reinstall_pil:
    command: "source /opt/python/run/venv/bin/activate && yes | pip install Pillow --no-cache-dir"

Answer 2

As suggested, I SSHed again into the instance and reinstalled Pillow through pip (/opt/python/run/venv/bin/pip), not before I has had sure libjpeg-devel was on environment before Pillow.

I ran selftest.py and it confirmed that I had support for jpeg. So, in a last try, I went to "Restart App Server" on Elastic Beanstalk interface. It worked.