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Host IDs

Mathew Charles edited this page Sep 30, 2021 · 16 revisions

Overview

The Functions Host uses a Host ID to uniquely identify a particular Function App. By default, the ID is auto-generated from the Function App name.

Host ID Collisions

If you have multiple Function Apps sharing a single storage account and they're each using the same Host ID, that will result in a collision. The HostID is used by the platform to store per-app correlated control/tracking information in the storage account. When multiple apps are using the same HostID (a collision), this can result incorrect behaviors. For example, some triggers like TimerTrigger/BlobTrigger store tracking info by HostID and can behave incorrectly when multiple apps use the same ID.

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