Ensemble_stitching instance undergoes unnecessary recreation during deployments

Products

• VMware Tanzu Platform Services - SALT

Issue/Introduction

The ensemble_stitching instance is updated during every BOSH deployment, even when no configuration changes have been made to the manifest or tile.

Environment

Platform Services Tile

Cause

The frpc job within the ensemble_stitching instance utilizes the SecureRandom library to generate values during the templating process. Because these values are randomized at runtime during every deployment, BOSH detects a configuration "diff" compared to the existing deployment. This forces BOSH to treat the instance as out-of-date and trigger a recreation.

 

Resolution

Aside from the increased deployment time caused by the instance recreation, there is no functional impact on the platform's performance or data integrity.

A permanent fix is currently being developed by the Engineering team to ensure deterministic configuration generation. 

Workaround: Currently, no manual workaround is required as the recreation does not disrupt service; however, you should expect the ensemble_stitching instance to show as "changed" in BOSH task logs.