Public bug reported: When using Content-Range for a partial download of an image with image caching enabled, the partial download fails due to a cache error as in [0]
This is because, the downloaded image is also getting cached using tee- iter in image_cache/__init__.py. Here there is a check for the images checksum and the download's checksum. With partial download, there is a mismatch of the full image checksum and the partial image checksum resulting in a 500. Steps to reproduce: 1. Create an image glance image-create --name test1 --visibility public --container-format bare --disk-format qcow2 < /home/stack/devstack/local.conf 2. Verify image creation and run the script to do a partial download. 2.a. glance image-list +--------------------------------------+---------------------------------+ | ID | Name | +--------------------------------------+---------------------------------+ | a3e38525-ad23-4ccb-9641-841f432ecf4a | cirros-0.3.4-x86_64-uec | | b3d0a0b6-5082-4250-a3d2-951992343a6e | cirros-0.3.4-x86_64-uec-kernel | | d123b95a-b00a-4db9-891b-a965c254581b | cirros-0.3.4-x86_64-uec-ramdisk | | 59c7e82a-6150-46b6-b19f-b93396bd5d8b | test1 | +--------------------------------------+---------------------------------+ 2.b. Execute the script that will request for a partial download of the above created image. [1] Fails with a 500. Traceback is as here: [2] The full download goes through successfully though. [3] [0] https://github.com/openstack/glance/blob/master/glance/image_cache/__init__.py#L360-L364 [1] http://paste.openstack.org/show/598886/ [2] http://paste.openstack.org/show/598881/ [3] http://paste.openstack.org/show/598887/ We need to educate cache here about a partial download to prevent this. ** Affects: glance Importance: Undecided Assignee: Dharini Chandrasekar (dharini-chandrasekar) Status: New ** Changed in: glance Assignee: (unassigned) => Dharini Chandrasekar (dharini-chandrasekar) -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to Glance. https://bugs.launchpad.net/bugs/1664709 Title: Partial download of image fails when using image caching Status in Glance: New Bug description: When using Content-Range for a partial download of an image with image caching enabled, the partial download fails due to a cache error as in [0] This is because, the downloaded image is also getting cached using tee-iter in image_cache/__init__.py. Here there is a check for the images checksum and the download's checksum. With partial download, there is a mismatch of the full image checksum and the partial image checksum resulting in a 500. Steps to reproduce: 1. Create an image glance image-create --name test1 --visibility public --container-format bare --disk-format qcow2 < /home/stack/devstack/local.conf 2. Verify image creation and run the script to do a partial download. 2.a. glance image-list +--------------------------------------+---------------------------------+ | ID | Name | +--------------------------------------+---------------------------------+ | a3e38525-ad23-4ccb-9641-841f432ecf4a | cirros-0.3.4-x86_64-uec | | b3d0a0b6-5082-4250-a3d2-951992343a6e | cirros-0.3.4-x86_64-uec-kernel | | d123b95a-b00a-4db9-891b-a965c254581b | cirros-0.3.4-x86_64-uec-ramdisk | | 59c7e82a-6150-46b6-b19f-b93396bd5d8b | test1 | +--------------------------------------+---------------------------------+ 2.b. Execute the script that will request for a partial download of the above created image. [1] Fails with a 500. Traceback is as here: [2] The full download goes through successfully though. [3] [0] https://github.com/openstack/glance/blob/master/glance/image_cache/__init__.py#L360-L364 [1] http://paste.openstack.org/show/598886/ [2] http://paste.openstack.org/show/598881/ [3] http://paste.openstack.org/show/598887/ We need to educate cache here about a partial download to prevent this. To manage notifications about this bug go to: https://bugs.launchpad.net/glance/+bug/1664709/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : [email protected] Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp
