Comment 1 for bug 2053242

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Heather Lanigan (hmlanigan) wrote : Re: Transiently failure in units during upgrade/refresh

This issue can happen with deploy as well, and has been seen in large models

Due to the async charm download feature introduced in juju 3.0, it's possible that the uniter tries to get the charm from the controller before it's completed download. At which point it errors and retries later.

Instead, the controller can return a pending download to try again later error so the uniter knows the charm is queued to be downloaded, or in process.