THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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- One way to delete stale ContainerPlacementMessages is to delete request/responses from the previous incarnation of the job in the metastore on job restarts, this is the responsibility of ContainerPlacementService
- Once the request is complete, ContainerPlacementService can issue an async delete to clean up the request from the metastore
- Request/response message can be externally cleaned by a tool
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