The underlying impact is that nodes must re-register on a more frequent basis.
Nodes find out they are out-of-date is during registration and immediately prior to starting a new set of work. Requiring nodes re-register on a shortened cycle provides more opportunities for nodes to get re-imaged.
Additionally, this addresses an issue handling the SAS URL expiry in a more clean fashion in the supervisor.
Add support for sharding across multiple storage accounts for blob containers used for corpus management.
Things to note:
1. Additional storage accounts must be in the same resource group, support the "blob" endpoint, and have the tag `storage_type` with the value `corpus`. A utility is provided (`src/utils/add-corpus-storage-accounts`), which adds storage accounts.
2. If any secondary storage accounts exist, they are used by default for containers.
3. Storage account names are cached in memory the Azure Function instance forever. Upon adding new storage accounts, the app needs to be restarted to pick up the new accounts.
We need to move to supporting data sharding.
One of the steps towards that is stop passing around `account_id`, rather we need to specify the type of storage we need.
