Internal error when building

CLI: [Warning] Failed to generate deltas due to an internal error; will be generated on-demand

Device:

19.07.20 16:14:53 (+0200) Downloading delta for image 'registry2.balena-cloud.com/v2/2020014a2e9d46357c7849b73e88dff3@sha256:6fe285d987386e9cf9d4a299366e7007ae9cac1ed3301c1a8ce9f7f255146ca0'
19.07.20 16:15:14 (+0200) Delta still processing remotely. Will retry...
19.07.20 16:15:15 (+0200) Downloading delta for image 'registry2.balena-cloud.com/v2/2020014a2e9d46357c7849b73e88dff3@sha256:6fe285d987386e9cf9d4a299366e7007ae9cac1ed3301c1a8ce9f7f255146ca0'
19.07.20 16:15:21 (+0200) Delta still processing remotely. Will retry...
19.07.20 16:15:21 (+0200) Downloading delta for image 'registry2.balena-cloud.com/v2/2020014a2e9d46357c7849b73e88dff3@sha256:6fe285d987386e9cf9d4a299366e7007ae9cac1ed3301c1a8ce9f7f255146ca0'
19.07.20 16:15:29 (+0200) Delta still processing remotely. Will retry...
19.07.20 16:15:30 (+0200) Downloading delta for image 'registry2.balena-cloud.com/v2/2020014a2e9d46357c7849b73e88dff3@sha256:6fe285d987386e9cf9d4a299366e7007ae9cac1ed3301c1a8ce9f7f255146ca0'
19.07.20 16:15:36 (+0200) Delta still processing remotely. Will retry...
19.07.20 16:15:36 (+0200) Downloading delta for image 'registry2.balena-cloud.com/v2/2020014a2e9d46357c7849b73e88dff3@sha256:6fe285d987386e9cf9d4a299366e7007ae9cac1ed3301c1a8ce9f7f255146ca0'
19.07.20 16:15:43 (+0200) Downloaded image 'registry2.balena-cloud.com/v2/2020014a2e9d46357c7849b73e88dff3@sha256:6fe285d987386e9cf9d4a299366e7007ae9cac1ed3301c1a8ce9f7f255146ca0'
19.07.20 16:15:43 (+0200) Killing service 'spotify sha256:1014f75070b085bbda71d5d8749f318965c5d8395d13452eed738129156c39c8'
19.07.20 16:15:55 (+0200) Service exited 'spotify sha256:1014f75070b085bbda71d5d8749f318965c5d8395d13452eed738129156c39c8'
19.07.20 16:15:55 (+0200) Killed service 'spotify sha256:1014f75070b085bbda71d5d8749f318965c5d8395d13452eed738129156c39c8'
19.07.20 16:15:56 (+0200) Deleting image 'registry2.balena-cloud.com/v2/694abf83f2ddbc32b733d222c0c41a45@sha256:e16ed2e5c412c7a82e3fa4c9698ed967d3d599877a8edd847ec605903ccc69e6'
19.07.20 16:15:56 (+0200) Deleted image 'registry2.balena-cloud.com/v2/694abf83f2ddbc32b733d222c0c41a45@sha256:e16ed2e5c412c7a82e3fa4c9698ed967d3d599877a8edd847ec605903ccc69e6'
19.07.20 16:15:57 (+0200) Installing service 'spotify sha256:82642eb2bb255a85a0c78172fbc1f479e5aa815ebdecaefd319dc7ae8d390db6'
19.07.20 16:15:57 (+0200) Installed service 'spotify sha256:82642eb2bb255a85a0c78172fbc1f479e5aa815ebdecaefd319dc7ae8d390db6'
19.07.20 16:15:57 (+0200) Starting service 'spotify sha256:82642eb2bb255a85a0c78172fbc1f479e5aa815ebdecaefd319dc7ae8d390db6'
19.07.20 16:15:59 (+0200) Started service 'spotify sha256:82642eb2bb255a85a0c78172fbc1f479e5aa815ebdecaefd319dc7ae8d390db6'
19.07.20 16:15:59 (+0200)  spotify  [2020-07-19T14:15:59Z INFO  librespot] librespot 9f3a02e (2020-06-22). Built on 2020-07-19. Build ID: XXMTpChH
19.07.20 16:15:59 (+0200)  spotify  [2020-07-19T14:15:59Z WARN  libmdns] Failed to register IPv6 receiver: Os { code: 19, kind: Other, message: "No such device" }

Idk if thats something to worry about. It just seems weird.

Hi, this delta generation error message points to an intermittent infrastructure problems on balenaCloud side that prevented delta generation at the release build time.

The delta is generated in order to minimize the bandwidth needed to update your docker images (instead of downloading the changed layers in the full size).

If it’s not generated at the release build time, it will be generated for a device on demand, when it tries to pull the new releasee, so the failure is not critical, it just may delay the release download a bit.